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Securities (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Available-for-Sale [Abstract]          
Amortized Cost $ 598,878,000   $ 598,878,000   $ 511,731,000
Gross Unrealized Gains 22,716,000   22,716,000   15,891,000
Gross Unrealized Losses (364,000)   (364,000)   (224,000)
Fair Value 621,230,000   621,230,000   527,398,000
Held-to-Maturity [Abstract]          
Amortized Cost 1,662,000   1,662,000   1,662,000
Gross Unrealized Gains 2,000   2,000   0
Gross Unrealized Losses 0   0   (1,000)
Fair Value 1,664,000   1,664,000   1,661,000
Available-for-Sale, Amortized Cost [Abstract]          
Due in one year or less 6,598,000   6,598,000    
Due after one through five years 21,375,000   21,375,000    
Due after five through ten years 64,291,000   64,291,000    
Due after ten years 33,641,000   33,641,000    
U.S. government sponsored agency mortgage-backed securities 437,391,000   437,391,000    
Total debt securities 563,296,000   563,296,000    
Marketable equity securities 35,582,000   35,582,000    
Total securities 598,878,000   598,878,000    
Available-for-Sale, Fair Value [Abstract]          
Due in one year or less 6,688,000   6,688,000    
Due after one through five years 22,377,000   22,377,000    
Due after five through ten years 67,275,000   67,275,000    
Due after ten years 35,679,000   35,679,000    
U.S. government sponsored agency mortgage-backed securities 452,731,000   452,731,000    
Total debt securities 584,750,000   584,750,000    
Marketable equity securities 36,480,000   36,480,000    
Total securities 621,230,000   621,230,000    
Held-to-Maturity, Amortized Cost [Abstract]          
Due in one year or less 0   0    
Due after one through five years 0   0    
Due after five through ten years 1,662,000   1,662,000    
Due after ten years 0   0    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,662,000   1,662,000    
Marketable equity securities 0   0    
Total securities 1,662,000   1,662,000    
Held-to-Maturity, Fair Value [Abstract]          
Due in one year or less 0   0    
Due after one through five years 0   0    
Due after five through ten years 1,664,000   1,664,000    
Due after ten years 0   0    
U.S. government sponsored agency mortgage-backed securities 0   0    
Total debt securities 1,664,000   1,664,000    
Marketable equity securities 0   0    
Total securities 1,664,000   1,664,000    
Securities gains, net 0 0 819,000 0  
Realized pre-tax gain on sale of securities     885,000 0  
Realized pre-tax loss on sale of securities     66,000 0  
Securities pledged as collateral to secure public deposit and for other purposes 233,700,000   233,700,000   198,600,000
Amortized cost of securities sold under agreements to repurchase 238,800,000   238,800,000   217,200,000
Percentage of total investment with unrealized losses (in hundredths) 3.40%   3.40%   4.80%
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 21,232,000   21,232,000   24,073,000
12 Months or More 329,000   329,000   942,000
Total 21,561,000   21,561,000   25,015,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (161,000)   (161,000)   (82,000)
12 Months or More (203,000)   (203,000)   (142,000)
Total (364,000)   (364,000)   (224,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 21,071,000   21,071,000   23,991,000
12 Months or More 126,000   126,000   800,000
Total 21,197,000   21,197,000   24,791,000
Held-to-Maturity, Amortized Cost [Abstract]          
Less Than 12 Months         480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]          
Less Than 12 Months         (1,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months         479,000
Unrealized losses of held-to-maturity securities 0   0    
U.S. Treasury and government agencies [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 26,139,000   26,139,000   32,077,000
Gross Unrealized Gains 516,000   516,000   1,171,000
Gross Unrealized Losses 0   0   0
Fair Value 26,655,000   26,655,000   33,248,000
Held-to-Maturity [Abstract]          
Amortized Cost 480,000   480,000   480,000
Gross Unrealized Gains 1,000   1,000   0
Gross Unrealized Losses 0   0   (1,000)
Fair Value 481,000   481,000   479,000
Held-to-Maturity, Amortized Cost [Abstract]          
Less Than 12 Months         480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]          
Less Than 12 Months         (1,000)
Held-to-Maturity, Fair Value [Abstract]          
Less Than 12 Months         479,000
State and political subdivisions [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 99,766,000   99,766,000   68,358,000
Gross Unrealized Gains 5,627,000   5,627,000   3,816,000
Gross Unrealized Losses (29,000)   (29,000)   (30,000)
Fair Value 105,364,000   105,364,000   72,144,000
Held-to-Maturity [Abstract]          
Amortized Cost 1,182,000   1,182,000   1,182,000
Gross Unrealized Gains 1,000   1,000   0
Gross Unrealized Losses 0   0   0
Fair Value 1,183,000   1,183,000   1,182,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 4,615,000   4,615,000   6,173,000
12 Months or More         613,000
Total 4,615,000   4,615,000   6,786,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (29,000)   (29,000)   (25,000)
12 Months or More         (5,000)
Total (29,000)   (29,000)   (30,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 4,586,000   4,586,000   6,148,000
12 Months or More         608,000
Total 4,586,000   4,586,000   6,756,000
U.S. government sponsored agency mortgage-backed securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 437,391,000   437,391,000   390,714,000
Gross Unrealized Gains 15,472,000   15,472,000   10,186,000
Gross Unrealized Losses (132,000)   (132,000)   (57,000)
Fair Value 452,731,000   452,731,000   400,843,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 16,617,000   16,617,000   17,900,000
Total 16,617,000   16,617,000   17,900,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (132,000)   (132,000)   (57,000)
Total (132,000)   (132,000)   (57,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 16,485,000   16,485,000   17,843,000
Total 16,485,000   16,485,000   17,843,000
Debt securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 563,296,000   563,296,000   491,149,000
Gross Unrealized Gains 21,615,000   21,615,000   15,173,000
Gross Unrealized Losses (161,000)   (161,000)   (87,000)
Fair Value 584,750,000   584,750,000   506,235,000
Available-for-Sale, Amortized Cost [Abstract]          
Less Than 12 Months 21,232,000   21,232,000   24,073,000
12 Months or More         613,000
Total 21,232,000   21,232,000   24,686,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
Less Than 12 Months (161,000)   (161,000)   (82,000)
12 Months or More         (5,000)
Total (161,000)   (161,000)   (87,000)
Available-for-Sale, Fair Value [Abstract]          
Less Than 12 Months 21,071,000   21,071,000   23,991,000
12 Months or More         608,000
Total 21,071,000   21,071,000   24,599,000
Marketable equity securities [Member]
          
Available-for-Sale [Abstract]          
Amortized Cost 35,582,000   35,582,000   20,582,000
Gross Unrealized Gains 1,101,000   1,101,000   718,000
Gross Unrealized Losses (203,000)   (203,000)   (137,000)
Fair Value 36,480,000   36,480,000   21,163,000
Available-for-Sale, Amortized Cost [Abstract]          
12 Months or More 329,000   329,000   329,000
Total 329,000   329,000   329,000
Available-for-Sale, Gross Unrealized Losses [Abstract]          
12 Months or More (203,000)   (203,000)   (137,000)
Total (203,000)   (203,000)   (137,000)
Available-for-Sale, Fair Value [Abstract]          
12 Months or More 126,000   126,000   192,000
Total $ 126,000   $ 126,000   $ 192,000