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Employee Benefits (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 $ 900,000 $ 900,000
Number of allocated shares under 401 (K) plan (in shares) 501,388 531,361 507,932
Annual contribution percentage under ESOP (in hundredths) 4.00%    
Contributions to ESOP by employer 1,400,000 1,400,000 1,300,000
Number of allocated shares under ESOP (in shares) 680,613 661,691 647,158
Stock Ownership Incentive Plans [Line Items]      
Number of shares transferred from one plan to another plan (in shares) 198,024    
Black-Scholes option pricing model, weighted average assumptions [Abstract]      
Expected option life     7 years 6 months
Expected volatility (in hundredths)     39.10%
Expected dividend yield (in hundredths)     4.78%
Risk-free interest rate (in hundredths)     3.139%
Stock-based compensation expense 600,000 700,000 800,000
Dividends paid on restricted stock shares 121,000 120,000 74,000
Weighted Average Exercise Price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 33.02 $ 32.36  
Outstanding at end of year (in dollars per share) $ 38.95 $ 33.02 $ 32.36
Options Outstanding Remaining life      
Weighted Average Exercise Price (in dollars per share) $ 38.95 $ 33.02 $ 32.36
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 1,133,000 1,729,000 990,000
Grant date fair value of shares vested for the year 34,000 284,000 719,000
Cash received from option exercises under all share-based payment arrangements for the year 3,137,000 134,000 672,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year 496,000 23,000 205,000
Expected period for recognition of unrecognized compensation cost 1 year 6 months    
Stock Options [Member]
     
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares) 326,000    
Weighted Average Price (in dollars per share) $ 32.64    
Options Outstanding Remaining life      
Accelerated vesting of share based awards approved (in shares)   5,215 3,750
Accelerated vesting of share based awards approved price (in dollars per share)   $ 38.95 $ 28.32
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)       
Weighted Average Price (in dollars per share)       
Maximum number of shares to be grant to a participant (in shares) 40,000    
Nonvested/Outstanding shares [Roll Forward]      
Nonvested/Outstanding (in shares) 96,543 52,834 16,786
Granted (in shares) 331 45,542 44,996
Exercised (in shares) 0 (1,617) (4,474)
Forfeited (in shares) 0 (216) (4,474)
Nonvested/Outstanding (in shares) 96,874 96,543 52,834
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested/Outstanding (in dollars per share) $ 27.91 $ 26.10 $ 28.83
Granted (in dollars per share) $ 30.92 $ 30.09 $ 25.09
Exercised (in dollars per share) $ 0 $ 30.09 $ 26.14
Forfeited (in dollars per share) $ 0 $ 30.09 $ 26.14
Nonvested/Outstanding (in dollars per share) $ 27.92 $ 27.91 $ 26.10
Options Outstanding Remaining life      
Accelerated vesting of share based awards approved (in shares)   1,617 4,474
Accelerated vesting of share based awards approved price (in dollars per share)   $ 30.09 $ 26.14
Performance Shares [Member]
     
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares)       
Weighted Average Price (in dollars per share)       
Maximum amount of shares to be grant to a participant 250,000    
Stock Appreciation Rights (SARs) [Member]
     
Options vested and expected to vest [Abstract]      
Number of Shares to Be Issued Upon Exercise/Vesting (in shares)       
Weighted Average Price (in dollars per share)       
Maximum number of shares to be grant to a participant (in shares) 100,000    
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) 321,540 371,077 420,731
Granted (in shares) 0 0 0
Exercised (in shares) (143,914) (6,824) (48,730)
Forfeited/expired (in shares) (100) (42,713) (924)
Outstanding at end of year (in shares) 177,526 321,540 371,077
Exercisable (in shares) 177,526 321,540 361,077
Weighted Average Exercise Price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 26.85 $ 27.07 $ 25.64
Granted (in dollars per share) $ 0 $ 0 $ 0
Exercised (in dollars per share) $ 21.83 $ 19.63 $ 14.66
Forfeited/expired (in dollars per share) $ 32.44 $ 29.94 $ 32.44
Outstanding at end of year (in dollars per share) $ 30.89 $ 26.85 $ 27.07
Exercisable (in dollars per share) $ 30.89 $ 26.85 $ 26.92
Options Outstanding Remaining life      
Total outstanding (in shares) 177,526 321,540 371,077
Weighted Average Exercise Price (in dollars per share) $ 30.89 $ 26.85 $ 27.07
Intrinsic value of options exercised 690,000 27,000 627,000
Intrinsic value of exercisable options 1,517,000 833,000 1,206,000
Intrinsic value of outstanding options 1,517,000 833,000 1,206,000
1998 Stock Option Plan [Member] | Options with remaining life one year or less [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 2,435    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 20.99    
Options Outstanding Remaining life      
Total outstanding (in shares) 2,435    
Weighted Average Exercise Price (in dollars per share) $ 20.99    
1998 Stock Option Plan [Member] | Options with remaining life two years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 34,100    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 27.85    
Options Outstanding Remaining life      
Total outstanding (in shares) 34,100    
Weighted Average Exercise Price (in dollars per share) $ 27.85    
1998 Stock Option Plan [Member] | Options with remaining life three years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 57,849    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 30.88    
Options Outstanding Remaining life      
Total outstanding (in shares) 57,849    
Weighted Average Exercise Price (in dollars per share) $ 30.88    
1998 Stock Option Plan [Member] | Options with remaining life four years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 83,142    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 32.44    
Options Outstanding Remaining life      
Total outstanding (in shares) 83,142    
Weighted Average Exercise Price (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) 1,245,189    
Shares Available for Future Issuance [Abstract]      
Shares available at January 1, 2012 (in shares) 1,442,719    
1998 Plan Forfeitures in 2012 (in shares) 100    
Restricted stock issuances in 2012 (in shares) (331)    
2006 Plan Forfeitures in 2012 (in shares) 725    
Shares available for future issuance (in shares) 1,443,213 1,442,719  
Options [Roll Forward]      
Outstanding at beginning of year (in shares) 152,571 177,125 174,678
Granted (in shares) 0 0 4,525
Exercised (in shares) (3,188) 0 0
Forfeited/expired (in shares) (725) (24,554) (2,078)
Outstanding at end of year (in shares) 148,658 152,571 177,125
Exercisable (in shares) 102,323 101,092 90,962
Weighted Average Exercise Price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 34.57 $ 34.61 $ 34.85
Granted (in dollars per share) $ 0 $ 0 $ 25.09
Exercised (in dollars per share) $ 28.51 $ 0 $ 0
Forfeited/expired (in dollars per share) $ 30.05 $ 34.84 $ 33.83
Outstanding at end of year (in dollars per share) $ 34.72 $ 34.57 $ 34.61
Exercisable (in dollars per share) $ 37.69 $ 37.81 $ 37.70
Nonvested/Outstanding shares [Roll Forward]      
Nonvested/Outstanding (in shares) 51,479    
Granted (in shares) 0    
Vested (in shares) (4,894)    
Forfeited (in shares) (250)    
Nonvested/Outstanding (in shares) 46,335 51,479  
Nonvested/Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested/Outstanding (in dollars per share) $ 6.53    
Granted (in dollars per share) $ 0    
Vested (in dollars per share) $ 7.02    
Forfeited (in dollars per share) $ 7.05    
Nonvested/Outstanding (in dollars per share) $ 6.48 $ 6.53  
Options Outstanding Remaining life      
Total outstanding (in shares) 148,658 152,571 177,125
Weighted Average Exercise Price (in dollars per share) $ 34.72 $ 34.57 $ 34.61
Weighted average fair value of options granted     30,000
Weighted average fair value per share of options granted (in dollars per share)     $ 6.53
Intrinsic value of options exercised 22,000 0 0
Intrinsic value of exercisable options 88,000 43,000 0
Intrinsic value of outstanding options $ 388,000 $ 345,000 $ 0
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life four years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 89,746    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 38.95    
Options Outstanding Remaining life      
Total outstanding (in shares) 89,746    
Weighted Average Exercise Price (in dollars per share) $ 38.95    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life five years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 46,700    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 28.32    
Options Outstanding Remaining life      
Total outstanding (in shares) 46,700    
Weighted Average Exercise Price (in dollars per share) $ 28.32    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life six years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 7,937    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 29.82    
Options Outstanding Remaining life      
Total outstanding (in shares) 7,937    
Weighted Average Exercise Price (in dollars per share) $ 29.82    
2006 Stock Ownership Incentive Plan [Member] | Options with remaining life seven years [Member]
     
Options [Roll Forward]      
Outstanding at end of year (in shares) 4,275    
Weighted Average Exercise Price [Abstract]      
Outstanding at end of year (in dollars per share) $ 25.09    
Options Outstanding Remaining life      
Total outstanding (in shares) 4,275    
Weighted Average Exercise Price (in dollars per share) $ 25.09