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Employee Benefits, Stock-Based Compensation (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Plan
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
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 2    
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) 509,335    
Black-Scholes option pricing model, weighted average assumptions [Abstract]      
Stock-based compensation expense | $ $ 710,000 $ 636,000 $ 458,000
Dividends paid on restricted stock shares | $ 51,000 53,000 37,000
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 | $ 1,072,000 1,242,000 835,000
Grant date fair value of shares vested for the year | $ 645,000 564,000 1,490,000
Cash received from option exercises under all share-based payment arrangements for the year | $ 399,000 693,000 2,099,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $ $ 49,000 $ 138,000 $ 3,000
Expected period for recognition of unrecognized compensation cost 2 years 4 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) 33,000    
Weighted average price (in dollars per share) | $ / shares $ 32.47    
Shares available for future issuance (in shares) [1] 509,335    
Black-Scholes option pricing model, weighted average assumptions [Abstract]      
Expected option life     7 years 6 months
Expected volatility     34.34%
Expected dividend yield     3.70%
Risk-free interest rate     1.45%
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]    
Shares issued (in shares) 44,988    
Maximum number of shares to be grant to a participant (in shares) 75,000    
Shares available for future issuance (in shares) [1]    
Performance Shares [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) [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]      
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 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) 519,140    
Forfeitures (in shares) 1,515    
Shares available for future issuance (in shares) 509,335 519,140  
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]      
Issuances (in shares) 0 0  
Options, number of shares [Roll Forward]      
Outstanding, beginning of period (in shares) 10,000 10,000 0
Granted (in shares) 0 0 10,000
Exercised (in shares) (10,000) 0 0
Forfeited/expired (in shares) 0 0 0
Outstanding, end of period (in shares) 0 10,000 10,000
Exercisable, end of period (in shares) 0 0 0
Options, weighted average exercise price [Abstract]      
Outstanding, beginning of period (in dollars per share) | $ / shares $ 33.55 $ 33.55 $ 0
Granted (in dollars per share) | $ / shares 0 0 33.55
Exercised (in dollars per share) | $ / shares 33.55 0 0
Forfeited/expired (in dollars per share) | $ / shares 0 0 0
Outstanding, end of period (in dollars per share) | $ / shares 0 33.55 33.55
Exercisable, end of period (in dollars per share) | $ / shares $ 0 $ 0 $ 0
Nonvested options, number of shares [Roll Forward]      
Nonvested, beginning of period (in shares) 10,000    
Granted (in shares) 0 0 10,000
Vested (in shares) (10,000)    
Forfeited (in shares) 0    
Nonvested, end of period (in shares) 0 10,000  
Nonvested options, weighted average grant date fair value [Abstract]      
Nonvested, beginning of period (in dollars per share) | $ / shares $ 6.82    
Granted (in dollars per share) | $ / shares 0    
Vested (in dollars per share) | $ / shares 6.82    
Forfeited (in dollars per share) | $ / shares 0    
Nonvested, end of period (in dollars per share) | $ / shares $ 0 $ 6.82  
Options, additional disclosures [Abstract]      
Intrinsic value of options exercised | $ $ 140,000 $ 0  
Intrinsic value of options exercisable | $ 0 0  
Intrinsic value of outstanding options | $ $ 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]      
Issuances (in shares) (11,320)    
Restricted stock activity, grants [Roll Forward]      
Outstanding, beginning of period (in shares) 33,085 17,496 0
Granted (in shares) [6] 11,320 23,668 18,069
Vested (in shares) (8,761) (5,751) (442)
Forfeited (in shares) (1,389) (2,328) (131)
Outstanding, end of period (in shares) 34,255 33,085 17,496
Restricted stock activity, weighted average fair value at grant [Roll Forward]      
Outstanding, beginning of period (in dollars per share) | $ / shares $ 41.84 $ 33.55 $ 0
Granted (in dollars per share) | $ / shares [6] 49.30 46.45 33.55
Vested (in dollars per share) | $ / shares 40.46 35.79 33.55
Forfeited (in dollars per share) | $ / shares 46.77 41.31 33.55
Outstanding, end of period (in dollars per share) | $ / shares $ 44.46 $ 41.84 $ 33.55
2006 Plan [Member] | Stock Options [Member]      
Options, number of shares [Roll Forward]      
Outstanding, beginning of period (in shares) 35,376 61,041 118,574
Granted (in shares) 0 0 0
Exercised (in shares) (2,475) (25,665) (57,423)
Forfeited/expired (in shares) (330) 0 (110)
Outstanding, end of period (in shares) 32,571 35,376 61,041
Exercisable, end of period (in shares) 2,571 5,376 30,629
Options, weighted average exercise price [Abstract]      
Outstanding, beginning of period (in dollars per share) | $ / shares $ 31.90 $ 29.84 $ 32.36
Granted (in dollars per share) | $ / shares 0 0 0
Exercised (in dollars per share) | $ / shares 25.52 27.01 35.02
Forfeited/expired (in dollars per share) | $ / shares 23.79 0 35.41
Outstanding, end of period (in dollars per share) | $ / shares 32.47 31.90 29.84
Exercisable, end of period (in dollars per share) | $ / shares $ 25.11 $ 25.22 $ 26.64
Nonvested options, number of shares [Roll Forward]      
Nonvested, beginning of period (in shares) 30,000    
Granted (in shares) 0 0 0
Vested (in shares) 0    
Forfeited (in shares) 0    
Nonvested, end of period (in shares) 30,000 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   $ 6.60
Vested (in dollars per share) | $ / shares 0    
Forfeited (in dollars per share) | $ / shares 0    
Nonvested, end of period (in dollars per share) | $ / shares $ 6.98 $ 6.98  
Options, additional disclosures [Abstract]      
Weighted average remaining contractual term 5 years    
Weighted average fair value of options granted | $     $ 100,000
Intrinsic value of options exercised | $ $ 56,000 $ 537,000 139,000
Intrinsic value of options exercisable | $ 37,000 118,000 703,000
Intrinsic value of outstanding options | $ $ 233,000 $ 538,000 $ 1,206,000
2006 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
Restricted stock activity, grants [Roll Forward]      
Outstanding, beginning of period (in shares) 5,426 11,989 64,735
Granted (in shares) 0 0 0
Vested (in shares) (3,236) (6,214) (52,521)
Forfeited (in shares) (126) (349) (225)
Outstanding, end of period (in shares) 2,064 5,426 11,989
Restricted stock activity, weighted average fair value at grant [Roll Forward]      
Outstanding, beginning of period (in dollars per share) | $ / shares $ 33.24 $ 32.85 $ 28.92
Granted (in dollars per share) | $ / shares 0 0 0
Vested (in dollars per share) | $ / shares 33.90 32.48 28.01
Forfeited (in dollars per share) | $ / shares 32.27 33.31 32.52
Outstanding, end of period (in dollars per share) | $ / shares $ 32.27 $ 33.24 $ 32.85
1998 Plan [Member] | Stock Options [Member]      
Options, number of shares [Roll Forward]      
Outstanding, beginning of period (in shares)   0 2,980
Granted (in shares)     0
Exercised (in shares)     (2,980)
Forfeited/expired (in shares)     0
Outstanding, end of period (in shares)     0
Exercisable, end of period (in shares)     0
Options, weighted average exercise price [Abstract]      
Outstanding, beginning of period (in dollars per share) | $ / shares   $ 0 $ 29.49
Granted (in dollars per share) | $ / shares     0
Exercised (in dollars per share) | $ / shares     29.49
Forfeited/expired (in dollars per share) | $ / shares     0
Outstanding, end of period (in dollars per share) | $ / shares     0
Exercisable, end of period (in dollars per share) | $ / shares     $ 0
Nonvested options, number of shares [Roll Forward]      
Nonvested, beginning of period (in shares) 0 0  
Granted (in shares)     0
Nonvested, end of period (in shares) 0 0 0
Options, additional disclosures [Abstract]      
Intrinsic value of options exercised | $     $ 13,000
Intrinsic value of options exercisable | $     0
Intrinsic value of outstanding options | $     $ 0
[1] Under the 2015 Plan, 550,000 shares are authorized for issuance; 44,988 have been issued as of December 31, 2018. 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, 2018. 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] Grants issued in 2016 were issued under the terms of the 2015 Plan pursuant to awards granted and earned under the 2006 Plan.