Annual report pursuant to Section 13 and 15(d)

Stock Compensation (Narrative) (Details)

v3.3.1.900
Stock Compensation (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
May. 21, 2015
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options outstanding     721,924 540,404 309,439 311,153
Unrecognized compensation expense related to stock options     $ 370,000      
Aggregate intrinsic value of options outstanding     0      
Intrinsic value of all options exercised     10,000 $ 40,000 $ 38,000  
Net cash proceeds from exercise of stock options     0 99,000 110,000  
Excess tax benefits from exercise of stock options     4,000 14,000 14,000  
Share based compensation expense before income taxes     899,000 785,000 (81,000)  
Share based compensation expense after income taxes     $ 584,000 $ 510,000 (53,000)  
Shares of ESOP allocated to accounts of eligible employees     577,965      
Shares issued under ESOP     37,640 32,520    
ESOP contributions     $ 467,731 $ 395,220 $ 362,273  
Scenario, Forecast [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued under ESOP   60,197        
2011 Executive Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of awards authorized 1,000,000          
Number of additional awards authorized 2,000,000          
Number of options granted     248,258      
Award expiration period     7 years      
Awards eligible for grant     1,120,376      
Shares issued under Plan     95,465      
Number of options outstanding     784,159      
2011 Executive Incentive Compensation Plan [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage     25.00%      
1992 Stock Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards eligible for grant     22,008      
Employee Stock Ownership Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     6 years      
Initial award vesting period     2 years      
Requisite service period     1 year      
Employee Stock Ownership Plan [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage     20.00%      
Non-Employee Directors [Member] | Stock Option Plan For Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options granted     0 0 0  
Award expiration period     10 years      
Number of shares automatically granted to each non-employee director     3,000      
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognition period for unrecognized compensation expense     2 years 2 months 12 days      
Deferred Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted     103,017 48,824 222,654  
Unrecognized compensation expense for awards     $ 348,000      
Recognition period for unrecognized compensation expense     1 year 9 months 18 days      
Deferred Stock [Member] | Key Employees [Member] | 2011 Executive Incentive Compensation Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted     100,017      
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted     20,979 13,973 31,354  
Unrecognized compensation expense for awards     $ 59,000      
Recognition period for unrecognized compensation expense     4 months 24 days      
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of price of common stock at which employees are able to acquire     85.00%      
Awards eligible for grant     101,240