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Stock-Based Compensation Plans (Additional Information) (Details) - USD ($)
12 Months Ended
May 01, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash used to settle stock based compensation transactions   $ 902,000 $ 373,000 $ 157,000
Cash received from exercise of stock options   $ 98,000 $ 1,300,000 $ 736,000
Performance period   0 years 5 years 3 months 18 days 5 years 3 months 18 days
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 $ 16,000 $ 22,000
Share-based compensation   20,000 30,000 51,000
Tax benefit from share based compensation   21,000 36,000 59,000
Unrecognized compensation cost for nonvested stock options   $ 41,000    
Unrecognized compensation cost, recognition period   2 years 3 months    
Total intrinsic value of options exercised   $ 268,000 2,500,000 573,000
Stock Options [Member] | SBM Financial, Inc. [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit from share based compensation   21,000 378,000 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   808,000 0 0
Share-based compensation   124,000 0 0
Tax benefit from share based compensation   27,000 0 0
Unrecognized compensation cost related to nonvested shares   $ 620,000    
Granted   18,762    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 686,000 925,000 1,000,000
Share-based compensation   762,000 703,000 327,000
Tax benefit from share based compensation   164,000 246,000 114,000
Total intrinsic value of options exercised   697,000 502,000 0
Unrecognized compensation cost related to nonvested shares   $ 787,000    
Granted   16,185    
Management Stock Purchase Plan [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   0.00%    
Stock based compensation, vesting period   2 years    
Grant date fair value of share based awards   $ 111,000 128,000 108,000
Share-based compensation   97,000 102,000 66,000
Tax benefit from share based compensation   21,000 36,000 23,000
Cash received from issuance of share based awards   180,000 241,000 220,000
Unrecognized compensation cost related to nonvested shares   $ 54,000    
Granted   8,088    
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   $ 421,000 454,000  
Long-Term Performance Share Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   370,000 1,080,000 330,000
Tax benefit from share based compensation   80,000 378,000 116,000
Total intrinsic value of options exercised   $ 697,000 502,000 963,000
Performance period   3 years    
Unrecognized compensation cost related to nonvested shares   $ 291,000    
Granted   16,830    
Deferred Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant date fair value of share based awards   $ 118,000 111,000 93,000
Share-based compensation   97,000 81,000 62,000
Tax benefit from share based compensation   $ 21,000 $ 28,000 $ 22,000
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%