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Stock-Based Compensation Plans (Additional Information) (Details) - USD ($)
12 Months Ended
May 01, 2012
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash used to settle stock based compensation transactions   $ 374,000 $ 455,000 $ 848,000
Cash received from exercise of stock options   $ 33,000 $ 95,000 $ 218,000
Performance period       5 years 3 months 18 days
Percentage of total compensation   4.00%    
Granted   0 0  
Stock Option and Incentive Plan 2003 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares of stock reserved and available for issuance 1,200,000      
Stock Option and Incentive Plan 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation, option granted, contractual life   10 years    
Stock based compensation, vesting period   5 years    
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards       $ 8,000
Share-based compensation   $ 4,000 $ 7,000 10,000
Tax benefit from share based compensation   7,000 8,000 50,000
Unrecognized compensation cost for nonvested stock options   $ 3,000    
Unrecognized compensation cost, recognition period   2 years    
Total intrinsic value of options exercised   $ 90,000 309,000 395,000
Stock Options [Member] | SBM Financial, Inc. [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit from share based compensation   1,000 1,000 0
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   500,000 657,000 887,000
Share-based compensation   475,000 389,000 263,000
Tax benefit from share based compensation   102,000 84,000 57,000
Unrecognized compensation cost related to nonvested shares   $ 1,196,000    
Granted   16,181    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 1,000,000.0 724,000 753,000
Share-based compensation   781,000 751,000 916,000
Tax benefit from share based compensation   168,000 161,000 197,000
Unrecognized compensation cost related to nonvested shares   $ 646,000    
Granted   31,983    
Management Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 83,000 85,000 139,000
Share-based compensation   71,000 95,000 104,000
Tax benefit from share based compensation   15,000 20,000 22,000
Cash received from issuance of share based awards   247,000 250,000 232,000
Unrecognized compensation cost related to nonvested shares   $ 51,000    
Granted   11,210    
Management Stock Purchase Plan [Member] | Interest and Other Liabilities [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash received from issuance of share based awards   $ 455,000 472,000  
Long-Term Performance Share Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   332,000 532,000 291,000
Tax benefit from share based compensation   71,000 114,000 63,000
Total intrinsic value of options exercised   $ 978,000 624,000 663,000
Performance period   3 years    
Unrecognized compensation cost related to nonvested shares   $ 388,000    
Granted   28,766    
Deferred Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 169,000 153,000 155,000
Share-based compensation   122,000 110,000 106,000
Tax benefit from share based compensation   $ 26,000 $ 24,000 $ 23,000
Percentage of total compensation   10.00%    
Percentage vested on 65th birthday   100.00%    
Qualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price as a percentage of fair market value on the date of grant 100.00%      
Nonqualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price as a percentage of fair market value on the date of grant 85.00%