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Employee Benefits (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
H
Plan
Dec. 31, 2012
Dec. 31, 2011
Employee Benefits [Abstract]      
Number of retirement savings plan 2    
Minimum age of employees to participate in plan 21 years    
Minimum requisite service period to participate in retirement plans 1 year    
Minimum annual working hours required to participate in plan 1,000    
Percentage of employee contribution, Minimum (in hundredths) 1.00%    
Percentage of employee contribution, Maximum (in hundredths) 15.00%    
Employer matching contribution (in hundredths) 50.00%    
Maximum contribution on employees gross pay (in hundredths) 4.00%    
Contribution by employer under 401(K) plan $ 1,000,000 $ 1,000,000 $ 900,000
Number of allocated shares under 401 (K) plan (in shares) 443,027 501,388 531,361
Annual contribution percentage under ESOP (in hundredths) 4.00%    
Contributions to ESOP by employer 1,500,000 1,400,000 1,400,000
Number of allocated shares under ESOP (in shares) 678,418 680,613 661,691
Stock Ownership Incentive Plans [Line Items]      
Number of active incentive stock option plan 1    
Number of inactive incentive stock option plan 1    
Number of shares transferred from one plan to another plan (in shares) 198,024    
Options vested and expected to vest [Abstract]      
Shares available for future issuance (in shares) 1,430,891    
Shares Available for Future Issuance [Abstract]      
Shares available for future issuance (in shares) 1,430,891    
Black-Scholes option pricing model, weighted average assumptions [Abstract]      
Expected option life (in years) 7 years 6 months    
Expected volatility (in hundredths) 39.11%    
Expected dividend yield (in hundredths) 3.74%    
Risk-free interest rate (in hundredths) 1.331%    
Stock-based compensation expense 700,000 600,000 700,000
Dividends paid on restricted stock shares 124,000 121,000 120,000
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted average fair value of options granted   0 0
Unrecognized compensation cost related to nonvested awards grant date fair value of vested shares and tax benefit realized from option exercises [Abstract]      
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end 1,366,000 1,133,000 1,729,000
Grant date fair value of shares vested for the year 521,000 34,000 284,000
Cash received from option exercises under all share-based payment arrangements for the year 5,306,000 3,137,000 134,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year 303,000 496,000 23,000
Expected period for recognition of unrecognized compensation cost 1 year 11 months 23 days    
Stock Options [Member]
      
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares) 159,000    
Weighted Average Price (in dollars per share) $ 33.86    
Shares available for future issuance (in shares) 1,430,891 [1]    
Shares Available for Future Issuance [Abstract]      
Shares available for future issuance (in shares) 1,430,891 [1]    
Restricted Stock [Member]
      
Stock Ownership Incentive Plans [Line Items]      
Shares authorized (in shares) 400,000    
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares)    [2]    
Weighted Average Price (in dollars per share)    [3]    
Shares available for future issuance (in shares)    [1]    
Maximum number of shares to be grant to a participant (in shares) 40,000    
Shares Available for Future Issuance [Abstract]      
Shares available for future issuance (in shares)    [1]    
Nonvested/Outstanding Options [Roll Forward]      
Nonvested/Outstanding (in shares) 96,874 96,543 52,834
Granted (in shares) 10,822 331 45,542
Vested (in shares) (9,959) 0 (1,617)
Forfeited (in shares) 0 0 (216)
Nonvested/Outstanding (in shares) 97,737 96,874 96,543
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested/Outstanding (in dollars per share) $ 27.92 $ 27.91 $ 26.10
Granted (in dollars per share) $ 33.70 $ 30.92 $ 30.09
Vested (in dollars per share) $ 28.46 $ 0 $ 30.09
Forfeited (in dollars per share) $ 0 $ 0 $ 30.09
Nonvested/Outstanding (in dollars per share) $ 28.50 $ 27.92 $ 27.91
Accelerated vesting of share based awards approved (in shares)     1,617
Accelerated vesting of share based awards approved price (in dollars per share)     $ 30.09
Performance Shares [Member]
      
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares)    [4]    
Weighted Average Price (in dollars per share)    [3]    
Shares available for future issuance (in shares)    [1]    
Maximum amount of shares to be grant to a participant 250,000    
Shares Available for Future Issuance [Abstract]      
Shares available for future issuance (in shares)    [1]    
Stock Appreciation Rights (SARs) [Member]
      
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares)    [5]    
Weighted Average Price (in dollars per share)    [3]    
Shares available for future issuance (in shares)    [1]    
Maximum number of shares to be grant to a participant (in shares) 100,000    
Shares Available for Future Issuance [Abstract]      
Shares available for future issuance (in shares)    [1]    
1998 Stock Option Plan [Member]
      
Stock Ownership Incentive Plans [Line Items]      
Shares authorized (in shares) 1,046,831    
Options [Roll Forward]      
Outstanding at beginning of year (in shares) 177,526 321,540 371,077
Granted (in shares) 0 0 0
Exercised (in shares) (106,557) (143,914) (6,824)
Forfeited/expired (in shares) 0 (100) (42,713)
Total outstanding, at end of year (in shares) 70,969 177,526 321,540
Exercisable (in shares) 70,969 177,526 321,540
Weighted Average Exercise Price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 30.89 $ 26.85 $ 27.07
Granted (in dollars per share) $ 0 $ 0 $ 0
Exercised (in dollars per share) $ 30.29 $ 21.83 $ 19.63
Forfeited/expired (in dollars per share) $ 0 $ 32.44 $ 29.94
Weighted average price outstanding at end of year (in dollars per share) $ 31.80 $ 30.89 $ 26.85
Exercisable (in dollars per share) $ 31.80 $ 30.89 $ 26.85
Nonvested/Outstanding Options [Roll Forward]      
Nonvested/Outstanding (in shares) 0    
Nonvested/Outstanding (in shares) 0 0  
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Intrinsic value of options exercised 1,175,000 690,000 27,000
Intrinsic value of exercisable options 948,000 1,517,000 833,000
Intrinsic value of outstanding options 948,000 1,517,000 833,000
1998 Stock Option Plan [Member] | Options with remaining life one year or less [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 28,971    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 30.88    
1998 Stock Option Plan [Member] | Options with remaining life two years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 41,998    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 32.44    
2006 Stock Ownership Incentive Plan [Member]
      
Stock Ownership Incentive Plans [Line Items]      
Shares authorized (in shares) 1,500,000    
Shares available for future grants (in shares) 1,232,867    
Options vested and expected to vest [Abstract]      
Shares available for future issuance (in shares) 1,430,891 1,443,213  
Shares Available for Future Issuance [Abstract]      
Shares available at January 1, 2013 (in shares) 1,443,213    
1998 Plan forfeitures in 2013 (in shares) 0    
2006 Plan stock option issuances for 2013 (in shares) (1,500)    
2006 Plan restricted stock issuances in 2013 (in shares) (10,822)    
2006 Plan forfeitures in 2013 (in shares) 0    
Shares available for future issuance (in shares) 1,430,891 1,443,213  
Options [Roll Forward]      
Outstanding at beginning of year (in shares) 148,658 152,571 177,125
Granted (in shares) 1,500 0 0
Exercised (in shares) (61,933) (3,188) 0
Forfeited/expired (in shares) 0 (725) (24,554)
Total outstanding, at end of year (in shares) 88,225 148,658 152,571
Exercisable (in shares) 84,543 102,323 101,092
Weighted Average Exercise Price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 34.72 $ 34.57 $ 34.61
Granted (in dollars per share) $ 33.70 $ 0 $ 0
Exercised (in dollars per share) $ 33.57 $ 28.51 $ 0
Forfeited/expired (in dollars per share) $ 0 $ 30.05 $ 34.84
Weighted average price outstanding at end of year (in dollars per share) $ 35.52 $ 34.72 $ 34.57
Exercisable (in dollars per share) $ 35.82 $ 37.69 $ 37.81
Nonvested/Outstanding Options [Roll Forward]      
Nonvested/Outstanding (in shares) 46,335    
Granted (in shares) 1,500    
Vested (in shares) (44,153)    
Forfeited (in shares) 0    
Nonvested/Outstanding (in shares) 3,682 46,335  
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested/Outstanding (in dollars per share) $ 6.48    
Granted (in dollars per share) $ 9.05    
Vested (in dollars per share) $ 6.48    
Forfeited (in dollars per share) $ 0    
Nonvested/Outstanding (in dollars per share) $ 7.56 $ 6.48  
Weighted average fair value of options granted 10,000    
Weighted average fair value per share of options granted (in dollars per share) $ 9.05 $ 0 $ 0
Intrinsic value of options exercised 477,000 22,000 0
Intrinsic value of exercisable options 790,000 88,000 43,000
Intrinsic value of outstanding options $ 849,000 $ 388,000 $ 345,000
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life three years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 59,563    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 38.95    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life four years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 18,700    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 28.32    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life five years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 4,500    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 29.82    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life six years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 3,962    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 25.09    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life nine years [Member]
      
Options [Roll Forward]      
Total outstanding, at end of year (in shares) 1,500    
Weighted Average Exercise Price [Abstract]      
Weighted average price outstanding at end of year (in dollars per share) $ 33.70    
[1] Under the 2006 Plan, 1.5 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, 2013, the above shares remained available for issuance.
[2] The maximum number of shares of restricted stock that may be granted is 400,000 shares, and the maximum that may be granted to a participant during any calendar year is 40,000 shares.
[3] Not applicable
[4] No performance units had been issued as of December 31, 2013. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $250,000.
[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.