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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Available-for-sale, amortized cost [Abstract] |  |  |
Due in one year or less | $ 43,386 |  |
Due after one through five years | 189,343 |  |
Due after five through ten years | 86,596 |  |
Due after ten years | 46,774 |  |
U.S. government sponsored agency mortgage-backed securities | 202,282 |  |
Amortized cost | 568,381 | $ 613,395 |
CRA investment funds | 25,000 |  |
Amortized cost | 593,381 | 638,395 |
Available-for-sale, fair value [Abstract] |  |  |
Due in one year or less | 43,403 |  |
Due after one through five years | 189,131 |  |
Due after five through ten years | 88,577 |  |
Due after ten years | 47,498 |  |
U.S. government sponsored agency mortgage-backed securities | 201,576 |  |
Total debt securities | 570,185 | 615,297 |
CRA investment funds | 24,751 |  |
Total securities | 594,936 |  |
Held-to-maturity, amortized cost [Abstract] |  |  |
Due in one year or less | 0 |  |
Due after one through five years | 1,181 |  |
Due after five through ten years | 480 |  |
Due after ten years | 0 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Amortized cost | 1,661 | 1,662 |
CRA investment funds | 0 |  |
Total securities | 1,661 |  |
Held-to-maturity, fair value [Abstract] |  |  |
Due in one year or less | 0 |  |
Due after one through five years | 1,183 |  |
Due after five through ten years | 468 |  |
Due after ten years | 0 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Total debt securities | 1,651 | 1,644 |
CRA investment funds | 0 |  |
Total securities | 1,651 |  |
Net loss realized on sales and calls of AFS securities | (106) | (211) | $ (45)
Realized pre-tax gain on sale of securities | 839 |  |
Realized pre-tax loss on sale of securities | 945 |  |
Securities pledged as collateral to secure public deposit and for other purposes | 228,200 | 267,100 |
Amortized cost of securities sold under agreements to repurchase | $ 285,500 | $ 280,900 |
Percentage of total investment with unrealized losses | 62.80% | 44.10% |
CRA Investments Funds [Member] |  |  |
Schedule of Available for Sale Securities [Line Items] |  |  |
Severity of impairment in percentage of fair value less than cost | 1.00% |  |

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