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Securities (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Available-for-Sale [Abstract]      
Amortized Cost $ 610,226,000   $ 511,731,000
Gross Unrealized Gains 19,145,000   15,891,000
Gross Unrealized Losses (129,000)   (224,000)
Fair Value 629,242,000   527,398,000
Held-to-Maturity [Abstract]      
Amortized Cost 1,662,000   1,662,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   (1,000)
Fair Value 1,662,000   1,661,000
Available-for-Sale, Amortized Cost [Abstract]      
Due in one year or less 6,869,000    
Due after one through five years 22,426,000    
Due after five through ten years 56,828,000    
Due after ten years 33,618,000    
Without single maturity 464,903,000    
Total debt securities 584,644,000    
Marketable equity securities 25,582,000    
Total securities 610,226,000    
Available-for-Sale, Fair Value [Abstract]      
Due in one year or less 6,917,000    
Due after one through five years 23,373,000    
Due after five through ten years 59,180,000    
Due after ten years 35,362,000    
Without single maturity 477,846,000    
Total debt securities 602,678,000    
Marketable equity securities 26,564,000    
Total securities 629,242,000    
Held-to-Maturity, Amortized Cost [Abstract]      
Due in one year or less 0    
Due after one through five years 0    
Due after five through ten years 1,662,000    
Due after ten years 0    
Without single maturity 0    
Total debt securities 1,662,000    
Marketable equity securities 0    
Total securities 1,662,000    
Held-to-Maturity, Fair Value [Abstract]      
Due in one year or less 0    
Due after one through five years 0    
Due after five through ten years 1,662,000    
Due after ten years 0    
Without single maturity 0    
Total debt securities 1,662,000    
Marketable equity securities 0    
Total securities 1,662,000    
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 242,800,000   198,600,000
Amortized cost of securities sold under agreements to repurchase 234,300,000   217,200,000
Percentage of total investment with unrealized losses (in hundredths) 3.00%   4.80%
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 18,421,000   24,073,000
12 Months or More 434,000   942,000
Total 18,855,000   25,015,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (88,000)   (82,000)
12 Months or More (41,000)   (142,000)
Total (129,000)   (224,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 18,333,000   23,991,000
12 Months or More 393,000   800,000
Total 18,726,000   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
U.S. Treasury and government agencies [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 26,169,000   32,077,000
Gross Unrealized Gains 496,000   1,171,000
Gross Unrealized Losses 0   0
Fair Value 26,665,000   33,248,000
Held-to-Maturity [Abstract]      
Amortized Cost 480,000   480,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   (1,000)
Fair Value 480,000   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 93,572,000   68,358,000
Gross Unrealized Gains 4,676,000   3,816,000
Gross Unrealized Losses (81,000)   (30,000)
Fair Value 98,167,000   72,144,000
Held-to-Maturity [Abstract]      
Amortized Cost 1,182,000   1,182,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses 0   0
Fair Value 1,182,000   1,182,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 8,129,000   6,173,000
12 Months or More 105,000   613,000
Total 8,234,000   6,786,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (81,000)   (25,000)
12 Months or More 0   (5,000)
Total (81,000)   (30,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 8,048,000   6,148,000
12 Months or More 105,000   608,000
Total 8,153,000   6,756,000
U.S. government sponsored agency mortgage-backed securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 464,903,000   390,714,000
Gross Unrealized Gains 12,950,000   10,186,000
Gross Unrealized Losses (7,000)   (57,000)
Fair Value 477,846,000   400,843,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 10,292,000   17,900,000
Total 10,292,000   17,900,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (7,000)   (57,000)
Total (7,000)   (57,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 10,285,000   17,843,000
Total 10,285,000   17,843,000
Debt securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 584,644,000   491,149,000
Gross Unrealized Gains 18,122,000   15,173,000
Gross Unrealized Losses (88,000)   (87,000)
Fair Value 602,678,000   506,235,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 18,421,000   24,073,000
12 Months or More 105,000   613,000
Total 18,526,000   24,686,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (88,000)   (82,000)
12 Months or More 0   (5,000)
Total (88,000)   (87,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 18,333,000   23,991,000
12 Months or More 105,000   608,000
Total 18,438,000   24,599,000
Marketable equity securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 25,582,000   20,582,000
Gross Unrealized Gains 1,023,000   718,000
Gross Unrealized Losses (41,000)   (137,000)
Fair Value 26,564,000   21,163,000
Available-for-Sale, Amortized Cost [Abstract]      
12 Months or More 329,000   329,000
Total 329,000   329,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
12 Months or More (41,000)   (137,000)
Total (41,000)   (137,000)
Available-for-Sale, Fair Value [Abstract]      
12 Months or More 288,000   192,000
Total $ 288,000   $ 192,000