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Employee Benefits, Stock-Based Compensation (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2016
shares
Dec. 31, 2019
USD ($)
Plan
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of active incentive stock option plan | Plan   1    
Number of inactive incentive stock option plan | Plan   1    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares available for future issuance (in shares)   481,000    
Unrecognized compensation cost, grant date fair value of vested shares, cash received from option exercises, and actual tax benefit realized [Abstract]        
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end | $   $ 1,410,000 $ 1,072,000 $ 1,242,000
Grant date fair value of shares vested for the year | $   605,000 645,000 564,000
Cash received from option exercises under all share-based payment arrangements for the year | $   401,000 399,000 693,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $   $ 27,000 $ 49,000 $ 138,000
Expected period for recognition of unrecognized compensation cost   1 year 10 months 24 days    
Stock Options [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares)   20,000    
Weighted average price (in dollars per share) | $ / shares   $ 32.04    
Grants (in shares)   0 0 0
Shares available for future issuance (in shares) [1]   481,000    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)   550,000    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [2]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum number of shares to be grant to a participant (in shares)   75,000    
Shares available for future issuance (in shares) [1]      
Performance Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued to date (in shares)   0    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [4]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum amount of shares to be grant to a participant | $   $ 1,000,000    
Shares available for future issuance (in shares) [1]      
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued to date (in shares)   0    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [5]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum number of shares to be grant to a participant (in shares)   100,000    
Shares available for future issuance (in shares) [1]      
2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)   550,000    
Number of shares issued to date (in shares)   72,909    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares available, beginning of period (in shares)   508,729    
Forfeitures (in shares)   588    
Shares available for future issuance (in shares)   481,396 508,729  
2015 Plan [Member] | Stock Options [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Grants (in shares)   0 0 0
Number of shares with accelerated vesting (in shares)     10,000  
Options, number of shares [Roll Forward]        
Outstanding at beginning of year (in shares)   0 [6] 10,000 [6] 10,000
Granted (in shares)   0 0 [6] 0
Exercised (in shares)   0 (10,000) [6] 0
Forfeited/expired (in shares)   0 0 [6] 0
Outstanding at end of year (in shares)   0 0 [6] 10,000 [6]
Exercisable at end of year (in shares)   0 0 [6] 0
Options, weighted average exercise price [Abstract]        
Outstanding, beginning of period (in dollars per share) | $ / shares   $ 0 [6] $ 33.55 [6] $ 33.55
Granted (in dollars per share) | $ / shares   0 0 [6] 0
Exercised (in dollars per share) | $ / shares   0 33.55 [6] 0
Forfeited/expired (in dollars per share) | $ / shares   0 0 [6] 0
Outstanding, end of period (in dollars per share) | $ / shares   0 0 [6] 33.55 [6]
Exercisable, end of period (in dollars per share) | $ / shares   $ 0 $ 0 [6] $ 0
Nonvested options, number of shares [Roll Forward]        
Granted (in shares)   0 0 [6] 0
Options, additional disclosures [Abstract]        
Intrinsic value of options exercised | $   $ 0 $ 140,000 $ 0
Intrinsic value of options exercisable | $   0 0 0
Intrinsic value of outstanding options | $   $ 0 $ 0 $ 136,000
2015 Plan [Member] | Restricted Stock [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares issued (in shares) 18,069      
Grants (in shares)   (27,921)    
Restricted stock activity, grants [Roll Forward]        
Outstanding at beginning of year (in shares)   34,255 33,085 17,496
Granted (in shares)   27,921 11,320 23,668
Vested (in shares)   (10,596) (8,761) (5,751)
Forfeited (in shares)   (588) (1,389) (2,328)
Outstanding at end of year (in shares)   50,992 34,255 33,085
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 44.46 $ 41.84 $ 33.55
Granted (in dollars per share) | $ / shares   41.12 49.30 46.45
Vested (in dollars per share) | $ / shares   42.39 40.46 35.79
Forfeited (in dollars per share) | $ / shares   43.04 46.77 41.31
Outstanding at end of year (in dollars per share) | $ / shares   $ 43.08 $ 44.46 $ 41.84
2006 Plan [Member] | Stock Options [Member]        
Options, number of shares [Roll Forward]        
Outstanding at beginning of year (in shares)   32,571 35,376 61,041
Granted (in shares)   0 0 0
Exercised (in shares)   (12,076) (2,475) (25,665)
Forfeited/expired (in shares)   0 (330) 0
Outstanding at end of year (in shares)   20,495 32,571 35,376
Exercisable at end of year (in shares)   495 2,571 5,376
Options, weighted average exercise price [Abstract]        
Outstanding, beginning of period (in dollars per share) | $ / shares   $ 32.47 $ 31.90 $ 29.84
Granted (in dollars per share) | $ / shares   0 0 0
Exercised (in dollars per share) | $ / shares   33.19 25.52 27.01
Forfeited/expired (in dollars per share) | $ / shares   0 23.79 0
Outstanding, end of period (in dollars per share) | $ / shares   32.04 32.47 31.90
Exercisable, end of period (in dollars per share) | $ / shares   $ 22.81 $ 25.11 $ 25.22
Nonvested options, number of shares [Roll Forward]        
Nonvested, beginning of period (in shares)   30,000    
Granted (in shares)   0 0 0
Vested (in shares)   10,000    
Forfeited (in shares)   0    
Nonvested, end of period (in shares)   20,000 30,000  
Nonvested options, weighted average grant date fair value [Abstract]        
Nonvested, beginning of period (in dollars per share) | $ / shares   $ 6.98    
Granted (in dollars per share) | $ / shares   0    
Vested (in dollars per share) | $ / shares   7.76    
Forfeited (in dollars per share) | $ / shares   0    
Nonvested, end of period (in dollars per share) | $ / shares   $ 6.59 $ 6.98  
Options, additional disclosures [Abstract]        
Weighted average remaining contractual term   5 years    
Intrinsic value of options exercised | $   $ 135,000 $ 56,000 $ 537,000
Intrinsic value of options exercisable | $   12,000 37,000 118,000
Intrinsic value of outstanding options | $   $ 299,000 $ 233,000 $ 538,000
2006 Plan [Member] | Restricted Stock [Member]        
Restricted stock activity, grants [Roll Forward]        
Outstanding at beginning of year (in shares)   2,064 5,426 11,989
Granted (in shares)   0 0 0
Vested (in shares)   (2,064) (3,236) (6,214)
Forfeited (in shares)   0 (126) (349)
Outstanding at end of year (in shares)   0 2,064 5,426
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 32.27 $ 33.24 $ 32.85
Granted (in dollars per share) | $ / shares   0 0 0
Vested (in dollars per share) | $ / shares   32.27 33.90 32.48
Forfeited (in dollars per share) | $ / shares   0 32.27 33.31
Outstanding at end of year (in dollars per share) | $ / shares   $ 0.00 $ 32.27 $ 33.24
[1] Under the 2015 Plan, 550,000 shares are authorized for issuance; 72,909 have been issued as of December 31, 2019  In January of 2016, 18,069 restricted stock shares were issued under the terms of the 2015 Plan pursuant to awards granted under the 2006 Plan.  Additional shares will not be issued pursuant to awards granted from prior plans.
[2] The maximum number of shares of restricted stock that may be granted is 550,000 shares, and the maximum that may be granted to a participant during any calendar year is 75,000 shares.
[3] Not applicable
[4] No performance units payable in stock had been issued as of December 31, 2019.  The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year is $1,000,000.
[5] No SARS have been issued.  The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year is 100,000 shares.
[6] Pursuant to the 2015 Plan provisions, the death of the option holder accelerated the vesting of 10,000 shares in 2018.