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Stock-Based Compensation Plans (Additional Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2012
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash used to settle stock based compensation transactions   $ 629 $ 374 $ 455
Unrecognized compensation cost for nonvested stock options   0 0 0
Cash received from exercise of stock options   $ 159 $ 33 $ 95
Percentage of total compensation   4.00%    
Granted   0 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]        
Share-based compensation   $ 0 $ 4 $ 7
Tax benefit from share based compensation   23 7 8
Total intrinsic value of options exercised   146 90 309
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 1 1
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   994 500 657
Share-based compensation   610 475 389
Tax benefit from share based compensation   $ 131 102 84
Granted   20,689    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 924 1,000 724
Share-based compensation   895 781 751
Tax benefit from share based compensation   $ 192 168 161
Granted   19,538    
Management Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 157 83 85
Share-based compensation   104 71 95
Tax benefit from share based compensation   22 15 20
Cash received from issuance of share based awards   $ 324 247 250
Granted   9,619    
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   $ 554 455  
Long-Term Performance Share Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   637 332 532
Tax benefit from share based compensation   137 71 114
Total intrinsic value of options exercised   $ 753 978 624
Performance period   3 years    
Granted   17,822    
Deferred Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 247 169 153
Share-based compensation   135 122 110
Tax benefit from share based compensation   $ 29 $ 26 $ 24
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%