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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Rate
Dec. 31, 2012
Rate
Dec. 31, 2011
Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, number of shares authorized 10,000,000    
Share-based compensation, number of shares available for grant 329,887    
Deferred compensation arrangement with individual, nonemployee directors, vesting period five    
Deferred compensation arrangement with individual, nonemployee director, service period, former plan six    
Salaries, Wages and Officers' Compensation [Abstract]      
Compensation expense, all share-based payment plans $ 1,411 $ 1,508 $ 1,349
Income tax benefit 348 383 329
Employee Stock Purchase Plan [Abstract]      
Shares purchased during the year 118,444    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Volatility rate 11.30% 11.70% 11.90%
Risk-free interest rate 2.10% 1.60% 2.90%
Expected dividend yield 1.50% 1.50% 1.50%
Expected life of awards (years) 9 years 4 months 24 days 9 years 1 month 6 days 8 years 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance 761,254    
Granted, Stock Options 198,500    
Exercised (297,508)    
Forfeited 0    
Outstanding, ending balance 662,246 761,254  
Exercisable, ending balance 342,146    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Granted, weighted average exercise price $ 23.20    
Exercised, weighted average exercise price $ 7.47    
Forfeited, weighted average exercise price $ 0    
Outstanding, weighted average exercise price, ending balance   $ 11.38  
Exercisable, weighted average remaining contractual life (years) 3 years 8 months 9 days    
Outstanding, unrecognized compensation cost 867    
Outstanding, aggregate intrinsic value 4,784    
Exercisable, aggregate intrinisic value 3,724    
Number outstanding 662,246    
Weighted average remaining contractual life (years) 5 years 11 months 1 day    
Outstanding options, weighted average exercise price $ 16.68    
Number exercisable 342,146    
Exercisable options, weighted average exercise price $ 13.02    
Employee Stock Purchase Plan [Member]
     
Employee Stock Purchase Plan [Abstract]      
Employee stock purchase, discount from market price, purchase date 15.00%    
Number of employees participating 1,500 1,157 1,272
Shares purchased during the year 118,444 136,947 150,253
Weighted-average per share purchase price paid $ 20.01 $ 17.20 $ 15.46
Cumulative shares purchased since 1982 8,636,226 8,517,782 8,380,835
Employee Stock Purchase Plan [Member]
     
Salaries, Wages and Officers' Compensation [Abstract]      
Compensation expense, all share-based payment plans 417 415 410
Employee Stock Purchase Plan [Abstract]      
Employee stock purchase plan, service period 1 year    
Employee stock purchase plan, percentage of market price, purchase date 85.00%    
Employee stock purchase, discount from market price, purchase date 15.00%    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, vesting period 10 years    
Salaries, Wages and Officers' Compensation [Abstract]      
Compensation expense, all share-based payment plans 234 166 269
Employee Stock Purchase Plan [Abstract]      
Stock options, awarded, outstanding 662,246    
Stock Appreciation Rights (SARs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation agreement with individual, annual grant per nonemployee director 3,000    
Share-based compensation, vesting period 5 years    
Salaries, Wages and Officers' Compensation [Abstract]      
Compensation expense, all share-based payment plans 315 283 185
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, beginning balance 257,817    
Granted 117,280    
Forfeited 0    
Vested (91,644)    
Unvested, ending balance 283,453 257,817  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, beginning balance $ 3.17    
Granted, weighted average award date value $ 3.17    
Forfeited, weighted average award date value $ 0    
Vested, weighted average award date value $ 3.23    
Unvested, weighted average award date value, ending balance $ 3.15 $ 3.17  
Weighted average remaining contractual life (years) 2 years 2 months 12 days    
Unrecognized compensation cost 630    
Aggregate intrinsic value 6,775    
Employee SSARs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, ending balance 253,720    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, ending balance $ 3.24    
Weighted average remaining contractual life (years) 2 years 1 month 6 days    
Unrecognized compensation cost 575    
Aggregate intrinsic value 6,064    
Nonemployee Director SSARs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, ending balance 29,733    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, ending balance $ 2.32    
Weighted average remaining contractual life (years) 2 years 6 months    
Unrecognized compensation cost 55    
Aggregate intrinsic value 711    
Restricted Stock Units (RSUs) [Member]
     
Salaries, Wages and Officers' Compensation [Abstract]      
Compensation expense, all share-based payment plans 445 644 485
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, beginning balance 78,653    
Granted 42,290    
Forfeited 0    
Vested (25,385)    
Unvested, ending balance 95,558 78,653  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, beginning balance $ 16.87    
Granted, weighted average award date value $ 21.67    
Forfeited, weighted average award date value $ 0    
Vested, weighted average award date value $ 16.73    
Unvested, weighted average award date value, ending balance $ 19.03 $ 16.87  
Weighted average remaining contractual life (years) 2 years 9 months 18 days    
Unrecognized compensation cost 1,098    
Aggregate intrinsic value 2,284    
Employee PRSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, ending balance 86,252    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, ending balance $ 18.69    
Weighted average remaining contractual life (years) 2 years 10 months 24 days    
Unrecognized compensation cost 932    
Aggregate intrinsic value 2,062    
Nonemployee Director PRSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, ending balance 9,306    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Unvested, weighted average award date value, ending balance $ 22.18    
Weighted average remaining contractual life (years) 2 years 3 months 18 days    
Unrecognized compensation cost 166    
Aggregate intrinsic value $ 222    
Employee Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, number of shares available for grant 3,200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Number outstanding 656,912    
Weighted average remaining contractual life (years) 5 years 11 months 16 days    
Outstanding options, weighted average exercise price $ 16.68    
Number exercisable 336,812    
Exercisable options, weighted average exercise price $ 12.96    
Employee Stock Option [Member] | $11.25 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Lower range limit $ 11.25    
Upper range limit $ 11.25    
Number outstanding 220,791    
Weighted average remaining contractual life (years) 2 years 5 months 5 days    
Outstanding options, weighted average exercise price $ 11.25    
Number exercisable 220,791    
Exercisable options, weighted average exercise price $ 11.25    
Employee Stock Option [Member] | $16.00 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Lower range limit $ 16.00    
Upper range limit $ 16.0    
Number outstanding 128,221    
Weighted average remaining contractual life (years) 5 years 10 months 2 days    
Outstanding options, weighted average exercise price $ 16.00    
Number exercisable 72,621    
Exercisable options, weighted average exercise price $ 16.00    
Employee Stock Option [Member] | $16.60 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Lower range limit $ 16.60    
Upper range limit $ 16.60    
Number outstanding 109,400    
Weighted average remaining contractual life (years) 6 years 10 months 2 days    
Outstanding options, weighted average exercise price $ 16.60    
Number exercisable 43,400    
Exercisable options, weighted average exercise price $ 16.60    
Employee Stock Option [Member] | $23.20 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Lower range limit $ 23.20    
Upper range limit $ 23.20    
Number outstanding 198,500    
Weighted average remaining contractual life (years) 9 years 5 months 23 days    
Outstanding options, weighted average exercise price $ 23.20    
Number exercisable 0    
Exercisable options, weighted average exercise price $ 23.20    
Director Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation aggrangement with individual, nonemployee director, former plan, term six    
Deferred compensation arrangement with individual, nonemployee director, annual grant per director, former plan 4,000    
Director Stock Option [Member] | $ 16.40 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Lower range limit $ 16.4    
Upper range limit $ 16.4    
Number outstanding 5,334    
Weighted average remaining contractual life (years) 8 months 16 days    
Outstanding options, weighted average exercise price $ 16.40    
Number exercisable 5,334    
Exercisable options, weighted average exercise price $ 16.40