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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 220,130 | $ 281,461
Investment Securities Available-for-Sale, Gross Unrealized Gains | 4,749 | 8,596
Investment Securities Available-for-Sale, Gross Unrealized Losses | (665) | (525)
Investment Securities Available-for-Sale, Fair Value | 224,214 | 289,532
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 227,221 | 224,682
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 7,444 | 6,858
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (172) | (95)
Investment Securities Held-to-Maturity, Fair Value | 234,493 | 231,445
Total, Amortized Cost | 447,351 | 506,143
Total, Gross Unrealized Gains | 12,193 | 15,454
Total, Gross Unrealized Losses | (837) | (620)
Total, Fair Value | 458,707 | 520,977
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 30,474 | 32,650
Investment Securities Available-for-Sale, Gross Unrealized Gains | 438 | 217
Investment Securities Available-for-Sale, Gross Unrealized Losses | (7) | (50)
Investment Securities Available-for-Sale, Fair Value | 30,905 | 32,817
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 35,519 | 27,103
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 642 | 322
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (47) | (28)
Investment Securities Held-to-Maturity, Fair Value | 36,114 | 27,397
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 46,943 | 58,836
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,162 | 1,531
Investment Securities Available-for-Sale, Gross Unrealized Losses | (14) | (11)
Investment Securities Available-for-Sale, Fair Value | 48,091 | 60,356
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,240 | 5,955
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 19 | 28
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (1) |
Investment Securities Held-to-Maturity, Fair Value | 4,258 | 5,983
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,996 | 3,042
Investment Securities Available-for-Sale, Gross Unrealized Gains | 59 | 4
Investment Securities Available-for-Sale, Fair Value | 3,055 | 3,046
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,150 | 4,266
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 97 | 50
Investment Securities Held-to-Maturity, Fair Value | 4,247 | 4,316
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 8,191 | 8,201
Investment Securities Available-for-Sale, Gross Unrealized Gains | 191 | 205
Investment Securities Available-for-Sale, Fair Value | 8,382 | 8,406
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 118,877 | 120,144
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 4,470 | 4,512
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (46) | (60)
Investment Securities Held-to-Maturity, Fair Value | 123,301 | 124,596
Trust Preferred Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 16,087 | 16,086
Investment Securities Available-for-Sale, Gross Unrealized Gains | 385 | 489
Investment Securities Available-for-Sale, Gross Unrealized Losses | (150) | (269)
Investment Securities Available-for-Sale, Fair Value | 16,322 | 16,306
Corporate Bonds and Notes [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 76,049 | 119,838
Investment Securities Available-for-Sale, Gross Unrealized Gains | 2,418 | 5,950
Investment Securities Available-for-Sale, Gross Unrealized Losses | (81) | (11)
Investment Securities Available-for-Sale, Fair Value | 78,386 | 125,777
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 36,016 | 38,950
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 888 | 1,026
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (78) | (7)
Investment Securities Held-to-Maturity, Fair Value | 36,826 | 39,969
Asset-backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 21,403 | 27,393
Investment Securities Available-for-Sale, Gross Unrealized Gains | 2 | 140
Investment Securities Available-for-Sale, Gross Unrealized Losses | (275) | (31)
Investment Securities Available-for-Sale, Fair Value | 21,130 | 27,502
Certificates of Deposit [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 1,896 | 2,098
Investment Securities Available-for-Sale, Gross Unrealized Gains | 27 | 27
Investment Securities Available-for-Sale, Gross Unrealized Losses | (3) | (2)
Investment Securities Available-for-Sale, Fair Value | 1,920 | 2,123
Equity Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 376 | 376
Investment Securities Available-for-Sale, Gross Unrealized Losses | (38) | (69)
Investment Securities Available-for-Sale, Fair Value | 338 | 307
Other Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 15,715 | 12,941
Investment Securities Available-for-Sale, Gross Unrealized Gains | 67 | 33
Investment Securities Available-for-Sale, Gross Unrealized Losses | (97) | (82)
Investment Securities Available-for-Sale, Fair Value | 15,685 | 12,892
US Treasury Securities [Member] |  |
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost | 28,419 | 28,264
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 1,328 | 920
Investment Securities Held-to-Maturity, Fair Value | $ 29,747 | $ 29,184

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