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Stock-Based Compensation Plans (Additional Information) (Details) - USD ($)
12 Months Ended
May 01, 2012
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash used to settle stock based compensation transactions   $ 455,000 $ 848,000 $ 902,000
Cash received from exercise of stock options   $ 95,000 $ 200,000 98,000
Performance period     5 years 4 months  
Percentage of total compensation   4.00%    
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 1,200,000.0      
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   $ 0 $ 8,000 0
Share-based compensation   7,000 10,000 20,000
Tax benefit from share based compensation   8,000 50,000 21,000
Unrecognized compensation cost for nonvested stock options   $ 7,000    
Unrecognized compensation cost, recognition period   2 years 6 months    
Total intrinsic value of options exercised   $ 309,000 395,000 268,000
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 0 7,000
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   657,000 887,000 808,000
Share-based compensation   389,000 263,000 124,000
Tax benefit from share based compensation   84,000 57,000 27,000
Unrecognized compensation cost related to nonvested shares   $ 1,258,000    
Granted   15,138    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 724,000 753,000 700,000
Share-based compensation   751,000 916,000 762,000
Tax benefit from share based compensation   161,000 197,000 164,000
Unrecognized compensation cost related to nonvested shares   $ 492,000    
Granted   16,347    
Management Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 85,000 139,000 111,000
Share-based compensation   95,000 104,000 97,000
Tax benefit from share based compensation   20,000 22,000 21,000
Cash received from issuance of share based awards   250,000 232,000 180,000
Unrecognized compensation cost related to nonvested shares   $ 57,000    
Granted   7,741    
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   $ 472,000 384,000  
Long-Term Performance Share Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   532,000 291,000 370,000
Tax benefit from share based compensation   114,000 63,000 80,000
Total intrinsic value of options exercised   $ 624,000 663,000 697,000
Performance period   3 years    
Unrecognized compensation cost related to nonvested shares   $ 455,000    
Granted   14,186    
Deferred Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 153,000 155,000 118,000
Share-based compensation   110,000 106,000 97,000
Tax benefit from share based compensation   $ 24,000 $ 23,000 $ 21,000
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%