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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Available-for-sale, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | $ 22,117 |  | $ 22,117 |  |
Due after one through five years | 114,754 |  | 114,754 |  |
Due after five through ten years | 127,998 |  | 127,998 |  |
Due after ten years | 50,627 |  | 50,627 |  |
U.S. government sponsored agency mortgage-backed securities | 239,017 |  | 239,017 |  |
Total debt securities | 554,513 |  | 554,513 |  | $ 613,395
CRA investment funds | 25,000 |  | 25,000 |  |
Amortized cost | 579,513 |  | 579,513 |  | 638,395
Available-for-sale, fair value [Abstract] |  |  |  |  |
Due in one year or less | 22,209 |  | 22,209 |  |
Due after one through five years | 115,899 |  | 115,899 |  |
Due after five through ten years | 127,897 |  | 127,897 |  |
Due after ten years | 50,870 |  | 50,870 |  |
U.S. government sponsored agency mortgage-backed securities | 239,564 |  | 239,564 |  |
Total debt securities | 556,439 |  | 556,439 |  | 615,297
CRA investment funds | 24,797 |  | 24,797 |  |
Total securities | 581,236 |  | 581,236 |  |
Held-to-maturity, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | 0 |  | 0 |  |
Due after one through five years | 1,181 |  | 1,181 |  |
Due after five through ten years | 480 |  | 480 |  |
Due after ten years | 0 |  | 0 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  | 0 |  |
Total debt securities | 1,661 |  | 1,661 |  | 1,662
CRA investment funds | 0 |  | 0 |  |
Total securities | 1,661 |  | 1,661 |  |
Held-to-maturity, fair value [Abstract] |  |  |  |  |
Due in one year or less | 0 |  | 0 |  |
Due after one through five years | 1,183 |  | 1,183 |  |
Due after five through ten years | 458 |  | 458 |  |
Due after ten years | 0 |  | 0 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  | 0 |  |
Total debt securities | 1,641 |  | 1,641 |  | 1,644
CRA investment funds | 0 |  | 0 |  |
Total securities | 1,641 |  | 1,641 |  |
Securities gains (loss), net | (14) | $ (51) | 130 | $ (111) |
Realized pre-tax gain on sale of securities |  |  | 828 |  |
Realized pre-tax loss on sale of securities |  |  | 698 |  |
Amortized cost of securities pledged as collateral to secure public deposit and for other purposes | 227,300 |  | 227,300 |  | 267,100
Amortized cost of securities sold under agreements to repurchase | $ 272,600 |  | $ 272,600 |  | $ 280,900

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