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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

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