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Stock Incentive Plans (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Plan
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
The 1995 Plan [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Stock Options [Member]
Dec. 31, 2012
The 2005 Plan [Member]
Stock Options [Member]
Dec. 31, 2011
The 2005 Plan [Member]
Stock Options [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Stock Options [Member]
Maximum [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Stock Options [Member]
Management Shares [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Stock Options [Member]
Officer [Member]
Sep. 30, 2007
The 2005 Plan [Member]
Performance Shares [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Performance Shares [Member]
Sep. 30, 2007
The 2005 Plan [Member]
Performance Shares [Member]
Management Shares [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Performance Shares [Member]
Management Shares [Member]
Dec. 31, 2012
The 2005 Plan [Member]
Performance Shares [Member]
Management Shares [Member]
Sep. 30, 2007
The 2005 Plan [Member]
Performance Shares [Member]
Employee Shares [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Performance Shares [Member]
Employee Shares [Member]
Sep. 30, 2007
The 2005 Plan [Member]
Performance Shares [Member]
Directors and Senior Management [Member]
Dec. 31, 2012
The 2005 Plan [Member]
Performance Shares [Member]
Employee Share [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Dec. 31, 2012
The 2005 Plan [Member]
Non Vested Shares [Member]
Dec. 31, 2011
The 2005 Plan [Member]
Non Vested Shares [Member]
Feb. 28, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Management Shares [Member]
Employee
Feb. 29, 2012
The 2005 Plan [Member]
Non Vested Shares [Member]
Management Shares [Member]
Employee
Feb. 28, 2011
The 2005 Plan [Member]
Non Vested Shares [Member]
Management Shares [Member]
Employee
Jun. 30, 2010
The 2005 Plan [Member]
Non Vested Shares [Member]
Management Shares [Member]
Employee
Dec. 31, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Management Shares [Member]
May 31, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Employee Shares [Member]
May 31, 2012
The 2005 Plan [Member]
Non Vested Shares [Member]
Employee Shares [Member]
Apr. 30, 2011
The 2005 Plan [Member]
Non Vested Shares [Member]
Employee Shares [Member]
Feb. 28, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Non Employee Director Shares [Member]
Feb. 29, 2012
The 2005 Plan [Member]
Non Vested Shares [Member]
Non Employee Director Shares [Member]
Feb. 28, 2011
The 2005 Plan [Member]
Non Vested Shares [Member]
Non Employee Director Shares [Member]
Jun. 30, 2010
The 2005 Plan [Member]
Non Vested Shares [Member]
Non Employee Director Shares [Member]
Dec. 31, 2013
The 2005 Plan [Member]
Non Vested Shares [Member]
Non Employee Director Shares [Member]
Jun. 30, 2010
The 2005 Plan [Member]
Non Vested Shares [Member]
Directors and Senior Management [Member]
Share-based Payment Award [Line Items]                                                                          
Number of Stock Incentive Plans 2                                                                        
Number of shares authorized for issuance (in shares)       1,440,000 1,440,000             68,130                                                  
Life of award       10 years 10 years       10 years   7 years                                                    
Stock options annual vesting percentage (in hundredths)                   25.00%                                                      
Fair Value Assumptions [Abstract]                                                                          
Dividend rate (in hundredths)           2.38% 3.05% 1.99%                                                          
Risk free interest rate (in hundredths)           1.15% 1.22% 2.73%                                                          
Expected lives of options           6 years 3 months 6 years 3 months 6 years 3 months                                                          
Price volatility (in hundredths)           40.66% 38.80% 38.45%                                                          
Share-based Compensation Expense           $ 612,000 $ 561,000 $ 601,000                         $ 1,300,000 $ 1,300,000 $ 1,100,000                            
Share based compensation income tax benefit           134,000 129,000 80,000                         500,000 300,000 400,000                            
Compensation cost related to non-vested           600,000                             1,900,000                                
Weighted-average period           3 years 1 month 6 days                             2 years 4 months 24 days                                
Options, Outstanding [Roll Forward]                                                                          
Outstanding at beginning of year (in shares) 748,000 661,000 503,000     494,688 406,894 341,108                                                          
Granted (in shares)           133,048 151,522 81,343                                                          
Cancelled (in shares)           (10,591) (8,728) (10,557)                                                          
Exercised (in shares)           (66,638) (55,000) (5,000)                                                          
Outstanding at end of period (in shares) 748,000 661,000 503,000     550,507 494,688 406,894                                                          
Options, weighted average grant price per option [Roll Forward]                                                                          
Outstanding at beginning of year (in dollars per share)           $ 17.82 $ 19.16 $ 19.69                                                          
Granted (in dollars per share)           $ 13.84 $ 10.82 $ 16.58                                                          
Cancelled (in dollars per share)           $ 25.26 $ 25.26 $ 21.87                                                          
Exercised (in dollars per share)           $ 16.82 $ 7.34 $ 7.34                                                          
Outstanding at end of period (in dollars per share)           $ 16.71 $ 17.82 $ 19.16                                                          
Options, Additional Disclosures [Abstract]                                                                          
Fair value per option (in dollars per share)           $ 4.33 $ 3.02 $ 5.62                                                          
Intrinsic value of outstanding options           4,900,000                                                              
Weighted average remaining contractual life           6 years 3 months 18 days                                                              
Number of options exercisable (in shares)           217,156                                                              
Weighted average exercise price, options exercisable (in dollars per share)           $ 20.49                                                              
Intrinsic value, options exercisable           1,100,000                                                              
Options exercisable, weighted average remaining contractual term           4 years 3 months 18 days                                                              
Share Price (in dollars per share)           $ 25.67                                                              
Fair value of options vested           600,000                                                              
Intrinsic value of options exercised           300,000                                                              
Proceeds from stock options exercised           1,200,000                                                              
Tax benefit realized from exercise of stock options           100,000                                                              
Compensation, nonvested awards, compensation cost not yet recognized           600,000                             1,900,000                                
Compensation, nonvested awards, cost not yet recognized, period for recognition           3 years 1 month 6 days                             2 years 4 months 24 days                                
Nonvested Shares [Roll Forward]                                                                          
Nonvested number, at beginning of year (in shares)                                         213,354 147,143 94,100                            
Granted (in shares)                                 44,726   23,404   98,686 119,354 78,707 62,283 66,384 54,075 34,142   24,843 38,186 16,184 11,560 14,784 8,448 7,272    
Cancelled (in shares)                                         (30,994) (8,098) (6,733)                            
Vested and issued (in shares)                                         (67,956) (45,045) (18,931)           9,567 14,040 8,159            
Nonvested number at end of year (in shares)                                         213,090 213,354 147,143                            
Stock Awards Additional Disclosures [Abstract]                                                                          
Period Stock Awards Can Vest                           30 days                                              
Fair value per share (in dollars per share)                       $ 20.50                       $ 13.84 $ 10.82 $ 16.58 $ 16.50   $ 17.48 $ 10.51 $ 18.06 $ 13.84 $ 10.82 $ 16.58     $ 16.50
Premium on grant date fair value (in dollars per share)                         $ 1.64                                                
Estimated expected forfeitures (in hundredths)                             40.00%     35.00%   39.00%                                  
Estimated forfeiture rate of awards (in hundredths)                               15.00%                                          
Additional compensation expense                               $ 48,000       $ 40,000                                  
Number of employees participating in grants of non vested shares                                               18 17 18 16                    
Share based awards vesting annually (in hundredths)                                                       25.00%               33.00%