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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 329,924 | $ 194,619
Investment Securities Available-for-Sale, Gross Unrealized Gains | 9,497 | 2,271
Investment Securities Available-for-Sale, Gross Unrealized Losses | (962) | (1,120)
Investment Securities Available-for-Sale, Fair Value | 338,459 | 195,770
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 224,056
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 6,793
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (291)
Investment Securities Held-to-Maturity, Fair Value |  | 230,558
Total, Amortized Cost |  | 418,675
Total, Gross Unrealized Gains |  | 9,064
Total, Gross Unrealized Losses |  | (1,411)
Total, Fair Value |  | 426,328
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 55,024 | 29,062
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,084 | 142
Investment Securities Available-for-Sale, Gross Unrealized Losses | (9) | (58)
Investment Securities Available-for-Sale, Fair Value | 56,099 | 29,146
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 33,616
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 280
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (119)
Investment Securities Held-to-Maturity, Fair Value |  | 33,777
Residential mortgage pass-through securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 62,124 | 44,155
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,292 | 803
Investment Securities Available-for-Sale, Gross Unrealized Losses | (12) | (48)
Investment Securities Available-for-Sale, Fair Value | 63,404 | 44,910
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 3,805
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 11
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (6)
Investment Securities Held-to-Maturity, Fair Value |  | 3,810
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 4,218 | 2,981
Investment Securities Available-for-Sale, Gross Unrealized Gains | 151 |
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (9)
Investment Securities Available-for-Sale, Fair Value | 4,369 | 2,972
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 4,110
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 27
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (2)
Investment Securities Held-to-Maturity, Fair Value |  | 4,135
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 135,781 | 8,188
Investment Securities Available-for-Sale, Gross Unrealized Gains | 5,582 | 169
Investment Securities Available-for-Sale, Gross Unrealized Losses | (2) |
Investment Securities Available-for-Sale, Fair Value | 141,361 | 8,357
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 118,015
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 5,001
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (3)
Investment Securities Held-to-Maturity, Fair Value |  | 123,013
Trust Preferred Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 5,574 | 16,088
Investment Securities Available-for-Sale, Gross Unrealized Gains | 310 | 398
Investment Securities Available-for-Sale, Gross Unrealized Losses | (209) | (231)
Investment Securities Available-for-Sale, Fair Value | 5,675 | 16,255
Corporate Bonds And Notes [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 37,725 | 53,566
Investment Securities Available-for-Sale, Gross Unrealized Gains | 916 | 702
Investment Securities Available-for-Sale, Gross Unrealized Losses | (348) | (292)
Investment Securities Available-for-Sale, Fair Value | 38,293 | 53,976
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 36,039
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 719
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (161)
Investment Securities Held-to-Maturity, Fair Value |  | 36,597
Asset-backed Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 15,797 | 20,005
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1 | 18
Investment Securities Available-for-Sale, Gross Unrealized Losses | (296) | (298)
Investment Securities Available-for-Sale, Fair Value | 15,502 | 19,725
Certificates of Deposit [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 973 | 1,895
Investment Securities Available-for-Sale, Gross Unrealized Gains | 15 | 18
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (8)
Investment Securities Available-for-Sale, Fair Value | 988 | 1,905
Equity Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 376 | 376
Investment Securities Available-for-Sale, Gross Unrealized Gains | 52 | 21
Investment Securities Available-for-Sale, Gross Unrealized Losses | (3) | (23)
Investment Securities Available-for-Sale, Fair Value | 425 | 374
Other Securities [Member] |  |
Investment securities available-for-sale |  |
Investment Securities Available-for-Sale, Amortized Cost | 12,332 | 18,303
Investment Securities Available-for-Sale, Gross Unrealized Gains | 94 |
Investment Securities Available-for-Sale, Gross Unrealized Losses | (83) | (153)
Investment Securities Available-for-Sale, Fair Value | $ 12,343 | 18,150
U.S. Treasury and agency securities [Member] |  |
Investment securities held-to-maturity |  |
Investment Securities Held-to-Maturity, Amortized Cost |  | 28,471
Investment Securities Held-to-Maturity, Gross Unrealized Gains |  | 755
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  |
Investment Securities Held-to-Maturity, Fair Value |  | $ 29,226

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