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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Available-for-sale, amortized cost [Abstract] |  |  |  |  |
Due in one year or less | $ 30,015 |  | $ 30,015 |  |
Due after one through five years | 128,605 |  | 128,605 |  |
Due after five through ten years | 124,654 |  | 124,654 |  |
Due after ten years | 50,436 |  | 50,436 |  |
U.S. government sponsored agency mortgage-backed securities | 212,829 |  | 212,829 |  |
Amortized cost | 546,539 |  | 546,539 |  | $ 613,395
CRA investment funds | 25,000 |  | 25,000 |  |
Amortized cost | 571,539 |  | 571,539 |  | 638,395
Available-for-sale, fair value [Abstract] |  |  |  |  |
Due in one year or less | 30,092 |  | 30,092 |  |
Due after one through five years | 129,937 |  | 129,937 |  |
Due after five through ten years | 126,142 |  | 126,142 |  |
Due after ten years | 51,338 |  | 51,338 |  |
U.S. government sponsored agency mortgage-backed securities | 214,176 |  | 214,176 |  |
Total debt securities | 551,685 |  | 551,685 |  | 615,297
CRA investment funds | 25,028 |  | 25,028 |  |
Total securities | 576,713 |  | 576,713 |  |
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 |  |
Amortized cost | 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 | 1,182 |  | 1,182 |  |
Due after five through ten years | 469 |  | 469 |  |
Due after ten years | 0 |  | 0 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  | 0 |  |
Total debt securities | 1,651 |  | 1,651 |  | 1,644
CRA investment funds | 0 |  | 0 |  |
Total securities | 1,651 |  | 1,651 |  |
Securities gains (loss), net | 12 | $ (34) | 142 | $ (145) |
Realized pre-tax gain on sale of securities |  |  | 840 |  |
Realized pre-tax loss on sale of securities |  |  | 698 |  |
Amortized cost of securities pledged as collateral to secure public deposit and for other purposes | 217,600 |  | 217,600 |  | 267,100
Amortized cost of securities sold under agreements to repurchase | $ 286,400 |  | $ 286,400 |  | $ 280,900

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