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Securities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Available-for-Sale [Abstract] |  |  |
Amortized Cost | $ 583,858,000 | $ 511,731,000 |
Gross Unrealized Gains | 19,805,000 | 15,891,000 |
Gross Unrealized Losses | (320,000) | (224,000) |
Fair Value | 603,343,000 | 527,398,000 |
Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,662,000 | 1,662,000 |
Gross Unrealized Gains | 1,000 | 0 |
Gross Unrealized Losses | (4,000) | (1,000) |
Fair Value | 1,659,000 | 1,661,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Due in one year or less | 6,408,000 |  |
Due after one through five years | 23,034,000 |  |
Due after five through ten years | 102,857,000 |  |
Due after ten years | 36,313,000 |  |
U.S. government sponsored agency mortgage-backed securities | 370,246,000 |  |
Total debt securities | 538,858,000 |  |
Marketable equity securities | 45,000,000 |  |
Total securities | 583,858,000 |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Due in one year or less | 6,483,000 |  |
Due after one through five years | 24,006,000 |  |
Due after five through ten years | 105,721,000 |  |
Due after ten years | 37,926,000 |  |
U.S. government sponsored agency mortgage-backed securities | 383,581,000 |  |
Total debt securities | 557,717,000 |  |
Marketable equity securities | 45,626,000 |  |
Total securities | 603,343,000 |  |
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 | 1,182,000 |  |
Due after ten years | 480,000 |  |
U.S. government sponsored agency mortgage-backed securities | 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 | 1,183,000 |  |
Due after ten years | 476,000 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Total debt securities | 1,659,000 |  |
Marketable equity securities | 0 |  |
Total securities | 1,659,000 |  |
Securities gains, net | 1,155,000 | 218,000 | 0
Realized pre-tax gain on sale of securities | 2,400,000 | 218,000 | 0
Realized pre-tax loss on sale of securities | 1,200,000 |  | 0
Securities pledged as collateral to secure public deposit and for other purposes | 262,400,000 | 198,600,000 |
Amortized cost of securities sold under agreements to repurchase | 237,300,000 | 217,200,000 |
Percentage of total investment with unrealized losses (in hundredths) | 11.50% | 4.80% |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 69,265,000 | 24,073,000 |
12 Months or More |  | 942,000 |
Total | 69,265,000 | 25,015,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (320,000) | (82,000) |
12 Months or More |  | (142,000) |
Total | (320,000) | (224,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 68,945,000 | 23,991,000 |
12 Months or More |  | 800,000 |
Total | 68,945,000 | 24,791,000 |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 480,000 | 480,000 |
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (4,000) | (1,000) |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Less Than 12 Months | 476,000 | 479,000 |
U.S. Treasury and government agencies [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 60,625,000 | 32,077,000 |
Gross Unrealized Gains | 463,000 | 1,171,000 |
Gross Unrealized Losses | (173,000) | 0 |
Fair Value | 60,915,000 | 33,248,000 |
Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 480,000 | 480,000 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4,000) | (1,000) |
Fair Value | 476,000 | 479,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 47,576,000 |  |
Total | 47,576,000 |  |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (173,000) |  |
Total | (173,000) |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 47,403,000 |  |
Total | 47,403,000 |  |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 480,000 | 480,000 |
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (4,000) | (1,000) |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Less Than 12 Months | 476,000 | 479,000 |
State and political subdivisions [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 107,987,000 | 68,358,000 |
Gross Unrealized Gains | 5,369,000 | 3,816,000 |
Gross Unrealized Losses | (135,000) | (30,000) |
Fair Value | 113,221,000 | 72,144,000 |
Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,182,000 | 1,182,000 |
Gross Unrealized Gains | 1,000 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 1,183,000 | 1,182,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 11,126,000 | 6,173,000 |
12 Months or More |  | 613,000 |
Total | 11,126,000 | 6,786,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (135,000) | (25,000) |
12 Months or More |  | (5,000) |
Total | (135,000) | (30,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 10,991,000 | 6,148,000 |
12 Months or More |  | 608,000 |
Total | 10,991,000 | 6,756,000 |
U.S. government sponsored agency mortgage-backed securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 370,246,000 | 390,714,000 |
Gross Unrealized Gains | 13,347,000 | 10,186,000 |
Gross Unrealized Losses | (12,000) | (57,000) |
Fair Value | 383,581,000 | 400,843,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 10,563,000 | 17,900,000 |
Total | 10,563,000 | 17,900,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (12,000) | (57,000) |
Total | (12,000) | (57,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 10,551,000 | 17,843,000 |
Total | 10,551,000 | 17,843,000 |
Debt securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 538,858,000 | 491,149,000 |
Gross Unrealized Gains | 19,179,000 | 15,173,000 |
Gross Unrealized Losses | (320,000) | (87,000) |
Fair Value | 557,717,000 | 506,235,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 69,265,000 | 24,073,000 |
12 Months or More |  | 613,000 |
Total | 69,265,000 | 24,686,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (320,000) | (82,000) |
12 Months or More |  | (5,000) |
Total | (320,000) | (87,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 68,945,000 | 23,991,000 |
12 Months or More |  | 608,000 |
Total | 68,945,000 | 24,599,000 |
Marketable equity securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 45,000,000 | 20,582,000 |
Gross Unrealized Gains | 626,000 | 718,000 |
Gross Unrealized Losses | 0 | (137,000) |
Fair Value | 45,626,000 | 21,163,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
12 Months or More |  | 329,000 |
Total |  | 329,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
12 Months or More |  | (137,000) |
Total |  | (137,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
12 Months or More |  | 192,000 |
Total |  | $ 192,000 |
Agency Securities [Member] |  |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Number of security sold | 4 |  |
Mortgage Backed Securities [Member] |  |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Number of security sold | 1 |  |
Auction Rate Securities [Member] |  |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Number of security sold | 5 |  |

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