Annual report pursuant to Section 13 and 15(d)

Stock Compensation (Narrative) (Details)

v3.21.1
Stock Compensation (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 19, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options outstanding   1,173,190 1,130,472 1,380,492  
Aggregate intrinsic value of options outstanding   $ 437,000      
Intrinsic value of all options exercised   18,000 $ 380,000    
Net cash proceeds from exercise of stock options   0 0    
Share based compensation expense before income taxes   463,000 413,000    
Share based compensation expense after income taxes   366,000 326,000    
Excess tax benefits from exercise of stock options   $ 0 $ 0    
2011 Executive Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards authorized         2,500,000
Number of options granted   191,301      
Award expiration period   7 years      
Shares issued under Plan   431,032      
Number of options outstanding   1,445,885      
Awards eligible for grant   623,083      
2011 Executive Incentive Compensation Plan [Member] | Share-based Payment Arrangement, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   25.00%      
ESOP [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      
Shares of ESOP allocated to accounts of eligible employees   706,287      
ESOP [Member] | Share-based Payment Arrangement, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage   20.00%      
2020 ESOP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESOP contributions   $ 328,263      
2020 ESOP [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of common stock to Employee Stock Ownership Plan, Shares 71,830        
2019 ESOP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESOP contributions   $ 407,584      
Issuance of common stock to Employee Stock Ownership Plan, Shares   66,059      
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense related to stock options   $ 222,000      
Recognition period for unrecognized compensation expense   2 years 9 months 18 days      
Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense for awards   $ 347,000      
Recognition period for unrecognized compensation expense   2 years 1 month 6 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   68,843      
2020 to 2022 [Member] | 2011 Executive Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
2020 to 2022 [Member] | Performance Units [Member] | 2011 Executive Incentive Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred stock awards granted   89,131