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Securities (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Security | Jun. 30, 2012 Security | Dec. 31, 2012
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | $ 691,793,000 |  | $ 691,793,000 |  | $ 583,858,000
Gross Unrealized Gains | 9,008,000 |  | 9,008,000 |  | 19,970,000
Gross Unrealized Losses | (13,439,000) |  | (13,439,000) |  | (485,000)
Fair Value | 687,362,000 |  | 687,362,000 |  | 603,343,000
Held-to-Maturity [Abstract] |  |  |  |  |
Amortized Cost | 1,662,000 |  | 1,662,000 |  | 1,662,000
Gross Unrealized Gains | 1,000 |  | 1,000 |  | 1,000
Gross Unrealized Losses | (42,000) |  | (42,000) |  | (4,000)
Fair Value | 1,621,000 |  | 1,621,000 |  | 1,659,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Due in one year or less | 5,785,000 |  | 5,785,000 |  |
Due after one through five years | 22,121,000 |  | 22,121,000 |  |
Due after five through ten years | 121,095,000 |  | 121,095,000 |  |
Due after ten years | 37,793,000 |  | 37,793,000 |  |
U.S. government sponsored agency mortgage-backed securities | 449,999,000 |  | 449,999,000 |  |
Total debt securities | 636,793,000 |  | 636,793,000 |  |
Marketable equity securities | 55,000,000 |  | 55,000,000 |  |
Total securities | 691,793,000 |  | 691,793,000 |  |
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Due in one year or less | 5,823,000 |  | 5,823,000 |  |
Due after one through five years | 22,811,000 |  | 22,811,000 |  |
Due after five through ten years | 117,651,000 |  | 117,651,000 |  |
Due after ten years | 37,265,000 |  | 37,265,000 |  |
U.S. government sponsored agency mortgage-backed securities | 450,336,000 |  | 450,336,000 |  |
Total debt securities | 633,886,000 |  | 633,886,000 |  |
Marketable equity securities | 53,476,000 |  | 53,476,000 |  |
Total securities | 687,362,000 |  | 687,362,000 |  |
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 | 1,182,000 |  | 1,182,000 |  |
Due after ten years | 480,000 |  | 480,000 |  |
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 | 1,183,000 |  | 1,183,000 |  |
Due after ten years | 438,000 |  | 438,000 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  | 0 |  |
Total debt securities | 1,621,000 |  | 1,621,000 |  |
Marketable equity securities | 0 |  | 0 |  |
Total securities | 1,621,000 |  | 1,621,000 |  |
Securities gains (loss), net | (8,000) | 819,000 | (8,000) | 819,000 |
Number of security sold |  |  | 2 | 2 |
Realized pre-tax gain on sale of securities |  |  |  | 885,000 |
Realized pre-tax loss on sale of securities |  |  |  | 66,000 |
Securities pledged as collateral to secure public deposit and for other purposes | 250,800,000 |  | 250,800,000 |  | 262,400,000
Amortized cost of securities sold under agreements to repurchase | 241,500,000 |  | 241,500,000 |  | 237,300,000
Percentage of total investment with unrealized losses (in hundredths) | 61.40% |  | 61.40% |  | 14.80%
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 435,115,000 |  | 435,115,000 |  | 89,265,000
Total | 436,215,000 |  | 436,215,000 |  | 89,265,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (13,416,000) |  | (13,416,000) |  | (485,000)
Total | (13,439,000) |  | (13,439,000) |  | (485,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 421,699,000 |  | 421,699,000 |  | 88,780,000
Total | 422,773,000 |  | 422,773,000 |  | 88,780,000
Held-to-Maturity, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 480,000 |  | 480,000 |  | 480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (42,000) |  | (42,000) |  | (4,000)
Held-to-Maturity, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 438,000 |  | 438,000 |  | 476,000
U.S. Treasury and government agencies [Member] |  |  |  |  |
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | 71,075,000 |  | 71,075,000 |  | 60,625,000
Gross Unrealized Gains | 288,000 |  | 288,000 |  | 463,000
Gross Unrealized Losses | (3,755,000) |  | (3,755,000) |  | (173,000)
Fair Value | 67,608,000 |  | 67,608,000 |  | 60,915,000
Held-to-Maturity [Abstract] |  |  |  |  |
Amortized Cost | 480,000 |  | 480,000 |  | 480,000
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | (42,000) |  | (42,000) |  | (4,000)
Fair Value | 438,000 |  | 438,000 |  | 476,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 60,516,000 |  | 60,516,000 |  | 47,576,000
Total | 60,516,000 |  | 60,516,000 |  | 47,576,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (3,755,000) |  | (3,755,000) |  | (173,000)
Total | (3,755,000) |  | (3,755,000) |  | (173,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 56,761,000 |  | 56,761,000 |  | 47,403,000
Total | 56,761,000 |  | 56,761,000 |  | 47,403,000
Held-to-Maturity, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 480,000 |  | 480,000 |  | 480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (42,000) |  | (42,000) |  | (4,000)
Held-to-Maturity, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 438,000 |  | 438,000 |  | 476,000
State and political subdivisions [Member] |  |  |  |  |
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | 115,719,000 |  | 115,719,000 |  | 107,987,000
Gross Unrealized Gains | 2,429,000 |  | 2,429,000 |  | 5,369,000
Gross Unrealized Losses | (2,206,000) |  | (2,206,000) |  | (135,000)
Fair Value | 115,942,000 |  | 115,942,000 |  | 113,221,000
Held-to-Maturity [Abstract] |  |  |  |  |
Amortized Cost | 1,182,000 |  | 1,182,000 |  | 1,182,000
Gross Unrealized Gains | 1,000 |  | 1,000 |  | 1,000
Gross Unrealized Losses | 0 |  | 0 |  | 0
Fair Value | 1,183,000 |  | 1,183,000 |  | 1,183,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 57,652,000 |  | 57,652,000 |  | 11,126,000
12 Months or More | 1,097,000 |  | 1,097,000 |  |
Total | 58,749,000 |  | 58,749,000 |  | 11,126,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (2,183,000) |  | (2,183,000) |  | (135,000)
12 Months or More | (23,000) |  | (23,000) |  |
Total | (2,206,000) |  | (2,206,000) |  | (135,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 55,469,000 |  | 55,469,000 |  | 10,991,000
12 Months or More | 1,074,000 |  | 1,074,000 |  |
Total | 56,543,000 |  | 56,543,000 |  | 10,991,000
U.S. government sponsored agency mortgage-backed securities [Member] |  |  |  |  |
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | 449,999,000 |  | 449,999,000 |  | 370,246,000
Gross Unrealized Gains | 6,291,000 |  | 6,291,000 |  | 13,347,000
Gross Unrealized Losses | (5,954,000) |  | (5,954,000) |  | (12,000)
Fair Value | 450,336,000 |  | 450,336,000 |  | 383,581,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 261,947,000 |  | 261,947,000 |  | 10,563,000
Total | 261,947,000 |  | 261,947,000 |  | 10,563,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (5,954,000) |  | (5,954,000) |  | (12,000)
Total | (5,954,000) |  | (5,954,000) |  | (12,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 255,993,000 |  | 255,993,000 |  | 10,551,000
Total | 255,993,000 |  | 255,993,000 |  | 10,551,000
Debt securities [Member] |  |  |  |  |
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | 636,793,000 |  | 636,793,000 |  | 538,858,000
Gross Unrealized Gains | 9,008,000 |  | 9,008,000 |  | 19,179,000
Gross Unrealized Losses | (11,915,000) |  | (11,915,000) |  | (320,000)
Fair Value | 633,886,000 |  | 633,886,000 |  | 557,717,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 380,115,000 |  | 380,115,000 |  | 69,265,000
12 Months or More | 1,097,000 |  | 1,097,000 |  |
Total | 381,212,000 |  | 381,212,000 |  | 69,265,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (11,892,000) |  | (11,892,000) |  | (320,000)
12 Months or More | (23,000) |  | (23,000) |  |
Total | (11,915,000) |  | (11,915,000) |  | (320,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 368,223,000 |  | 368,223,000 |  | 68,945,000
12 Months or More | 1,074,000 |  | 1,074,000 |  |
Total | 369,297,000 |  | 369,297,000 |  | 68,945,000
Marketable equity securities [Member] |  |  |  |  |
Available-for-Sale [Abstract] |  |  |  |  |
Amortized Cost | 55,000,000 |  | 55,000,000 |  | 45,000,000
Gross Unrealized Gains | 0 |  | 0 |  | 791,000
Gross Unrealized Losses | (1,524,000) |  | (1,524,000) |  | (165,000)
Fair Value | 53,476,000 |  | 53,476,000 |  | 45,626,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |  |  |
Less Than 12 Months | 55,000,000 |  | 55,000,000 |  | 20,000,000
Total | 55,000,000 |  | 55,000,000 |  | 20,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |  |  |
Less Than 12 Months | (1,524,000) |  | (1,524,000) |  | (165,000)
Total | (1,524,000) |  | (1,524,000) |  | (165,000)
Available-for-Sale, Fair Value [Abstract] |  |  |  |  |
Less Than 12 Months | 53,476,000 |  | 53,476,000 |  | 19,835,000
Total | $ 53,476,000 |  | $ 53,476,000 |  | $ 19,835,000

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