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Employee Benefits, Stock-Based Compensation (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2016
$ / shares
shares
Dec. 31, 2015
USD ($)
Plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
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)   568,000    
Shares available for future issuance [Abstract]        
Shares available, beginning of period (in shares)   1,563,702    
Shares available for future issuance (in shares)     1,563,702  
Black-Scholes option pricing model, weighted average assumptions [Abstract]        
Stock-based compensation expense | $   $ 800,000 $ 900,000 $ 700,000
Dividends paid on restricted stock shares | $   80,000 121,000 124,000
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 | $   495,000 861,000 1,366,000
Grant date fair value of shares vested for the year | $   1,111,000 343,000 521,000
Cash received from option exercises under all share-based payment arrangements for the year | $   1,212,000 1,163,000 5,306,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $   $ 82,000 $ 93,000 $ 303,000
Expected period for recognition of unrecognized compensation cost   2 years 6 months    
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)   122,000    
Weighted average price (in dollars per share) | $ / shares   $ 32.29    
Shares available for future issuance (in shares) [1]   568,000    
Black-Scholes option pricing model, weighted average assumptions [Abstract]        
Expected option life   7 years 7 years 7 years 6 months
Expected volatility   30.77% 30.77% 39.11%
Expected dividend yield   3.72% 3.40% 3.74%
Risk-free interest rate   1.54% 2.01% 1.33%
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 available for future issuance (in shares) [1]      
Maximum number of shares to be grant to a participant (in shares)   75,000    
Restricted stock activity, grants [Roll Forward]        
Outstanding, beginning of period (in shares) 64,735 101,309 107,511 106,561
Granted (in shares)   10,582 4,561 11,904
Vested (in shares)   (46,482) (8,949) (10,954)
Forfeited (in shares)   (674) (1,814) 0
Outstanding, end of period (in shares)   64,735 101,309 107,511
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Outstanding, beginning of period (in dollars per share) | $ / shares $ 28.92 $ 26.19 $ 25.91 $ 25.38
Granted (in dollars per share) | $ / shares   32.27 37.85 30.64
Vested (in dollars per share) | $ / shares   23.66 28.35 25.87
Forfeited (in dollars per share) | $ / shares   33.31 28.38 0
Outstanding, end of period (in dollars per share) | $ / shares   $ 28.92 $ 26.19 $ 25.91
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]      
Shares available for future issuance (in shares) [1]      
Maximum amount of shares to be grant to a participant | $   $ 1,000,000    
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]      
Shares available for future issuance (in shares) [1]      
Maximum number of shares to be grant to a participant (in shares)   100,000    
1998 Plan [Member]        
Shares available for future issuance [Abstract]        
Forfeitures (in shares)   0    
1998 Plan [Member] | Stock Options [Member]        
Options, number of shares [Roll Forward]        
Outstanding, beginning of period (in shares) 2,980 43,960 78,066 195,279
Granted (in shares)   0 0 0
Exercised (in shares)   (40,980) (34,106) (117,213)
Forfeited/expired (in shares)   0 0 0
Outstanding, end of period (in shares)   2,980 43,960 78,066
Exercisable, end of period (in shares)   2,980 43,960 78,066
Options, weighted average exercise price [Abstract]        
Outstanding, beginning of period (in dollars per share) | $ / shares $ 29.49 $ 29.43 $ 28.91 $ 28.08
Granted (in dollars per share) | $ / shares   0 0 0
Exercised (in dollars per share) | $ / shares   29.42 28.25 27.54
Forfeited/expired (in dollars per share) | $ / shares   0 0 0
Outstanding, end of period (in dollars per share) | $ / shares   29.49 29.43 28.91
Exercisable, end of period (in dollars per share) | $ / shares   $ 29.49 $ 29.43 $ 28.91
Nonvested options, number of shares [Roll Forward]        
Granted (in shares)   0 0 0
Nonvested options, weighted average grant date fair value [Abstract]        
Intrinsic value of options exercised | $   $ 241,000 $ 270,000 $ 1,175,000
Intrinsic value of options exercisable | $   16,000 316,000 948,000
Intrinsic value of outstanding options | $   $ 16,000 $ 316,000 $ 948,000
Restricted stock activity, grants [Roll Forward]        
Outstanding, beginning of period (in shares) 0 0    
Outstanding, end of period (in shares)   0 0  
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Weighted average remaining contractual term   25 days    
2006 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)   1,650,000    
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)   1,533,794    
Shares available for future issuance [Abstract]        
Shares available, beginning of period (in shares) 18,069      
Forfeitures (in shares)   674    
Canceled at plan termination (in shares)   (1,515,725)    
Shares available for future issuance (in shares)   18,069    
2006 Plan [Member] | Stock Options [Member]        
Shares available for future issuance [Abstract]        
Issuances (in shares)   (20,000)    
Options, number of shares [Roll Forward]        
Outstanding, beginning of period (in shares) 118,574 98,821 97,047 163,524
Granted (in shares)   20,000 10,000 1,650
Exercised (in shares)   (247) (5,757) (68,127)
Forfeited/expired (in shares)   0 (2,469) 0
Outstanding, end of period (in shares)   118,574 98,821 97,047
Exercisable, end of period (in shares)   87,749 86,264 92,997
Options, weighted average exercise price [Abstract]        
Outstanding, beginning of period (in dollars per share) | $ / shares $ 32.36 $ 32.35 $ 32.29 $ 31.56
Granted (in dollars per share) | $ / shares   32.27 34.75 30.64
Exercised (in dollars per share) | $ / shares   24.12 34.62 30.52
Forfeited/expired (in dollars per share) | $ / shares   0 34.29 0
Outstanding, end of period (in dollars per share) | $ / shares   32.36 32.35 32.29
Exercisable, end of period (in dollars per share) | $ / shares   $ 32.12 $ 32.25 $ 32.56
Nonvested options, number of shares [Roll Forward]        
Nonvested, beginning of period (in shares) 30,825 12,557    
Granted (in shares)   20,000 10,000 1,650
Vested (in shares)   (1,732)    
Forfeited (in shares)   0    
Nonvested, end of period (in shares)   30,825 12,557  
Nonvested options, weighted average grant date fair value [Abstract]        
Nonvested, beginning of period (in dollars per share) | $ / shares $ 7.02 $ 7.61    
Granted (in dollars per share) | $ / shares   6.60 $ 7.76 $ 8.23
Vested (in dollars per share) | $ / shares   6.48    
Forfeited (in dollars per share) | $ / shares   0    
Nonvested, end of period (in dollars per share) | $ / shares   $ 7.02 $ 7.61  
Weighted average fair value of options granted | $   $ 130,000 $ 80,000 $ 10,000
Intrinsic value of options exercised | $   3,000 11,000 477,000
Intrinsic value of options exercisable | $   275,000 376,000 790,000
Intrinsic value of outstanding options | $   $ 334,000 $ 421,000 $ 849,000
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Weighted average remaining contractual term   3 years 6 months    
2006 Plan [Member] | Restricted Stock [Member]        
Shares available for future issuance [Abstract]        
Issuances (in shares)   (10,582)    
2006 Plan [Member] | Restricted Stock [Member] | Subsequent Event [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      
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 for future issuance (in shares)   550,000    
[1] Under the 2015 Plan, 550,000 shares are authorized for issuance, none have been issued. Under the 2006 Plan, 1.65 million shares (plus any shares reserved for issuance under the 1998 Stock Option Plan) were authorized for issuance as nonqualified and incentive stock options, SARS, restricted stock and performance units. As of December 31, 2015, 1.5 million shares were available for issuance pursuant to awards granted prior to the termination of the plan on April 28, 2015. In January of 2016, 18,069 restricted stock shares were issued pursuant to these awards. 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, 2015. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $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 shall be 100,000 shares.