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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available-for-Sale |  |
Amortized Cost | $ 419,711 | $ 391,694
Gross Unrealized Gains | 504 | 1,147
Gross Unrealized Losses | (11,379) | (7,355)
Fair Value | 408,836 | 385,486
Securities Held-to-Maturity |  |
Amortized Cost | 250,044 | 259,670
Gross Unrealized Gains | 8,188 | 5,035
Gross Unrealized Losses | (24) | (1,439)
Fair Value | 258,208 | 263,266
U.S. Treasury |  |
Securities Available-for-Sale |  |
Amortized Cost | 1,514 | 1,529
Gross Unrealized Gains | 1 |
Gross Unrealized Losses |  | (2)
Fair Value | 1,515 | 1,527
U.S. government agencies |  |
Securities Available-for-Sale |  |
Amortized Cost | 1,690 | 1,711
Gross Unrealized Losses | (113) | (87)
Fair Value | 1,577 | 1,624
States and political subdivisions |  |
Securities Available-for-Sale |  |
Amortized Cost | 22,918 | 21,682
Gross Unrealized Gains | 401 | 432
Gross Unrealized Losses | (149) | (96)
Fair Value | 23,170 | 22,018
Corporate bonds |  |
Securities Available-for-Sale |  |
Amortized Cost | 30,160 | 31,243
Gross Unrealized Gains |  | 309
Gross Unrealized Losses | (580) | (567)
Fair Value | 29,580 | 30,985
Collateralized mortgage obligations |  |
Securities Available-for-Sale |  |
Amortized Cost | 72,015 | 65,728
Gross Unrealized Gains | 53 | 31
Gross Unrealized Losses | (1,191) | (2,132)
Fair Value | 70,877 | 63,627
Securities Held-to-Maturity |  |
Amortized Cost | 213,298 | 222,545
Gross Unrealized Gains | 5,746 | 3,005
Gross Unrealized Losses | (24) | (1,439)
Fair Value | 219,020 | 224,111
Asset-backed securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 195,100 | 175,565
Gross Unrealized Gains | 49 | 199
Gross Unrealized Losses | (8,053) | (2,268)
Fair Value | 187,096 | 173,496
Collateralized loan obligations |  |
Securities Available-for-Sale |  |
Amortized Cost | 94,265 | 94,236
Gross Unrealized Gains |  | 176
Gross Unrealized Losses | (1,278) | (2,203)
Fair Value | 92,987 | 92,209
U.S. government agency mortgage-backed |  |
Securities Available-for-Sale |  |
Amortized Cost | 2,049 |
Gross Unrealized Losses | (15) |
Fair Value | 2,034 |
Securities Held-to-Maturity |  |
Amortized Cost | 36,746 | 37,125
Gross Unrealized Gains | 2,442 | 2,030
Fair Value | $ 39,188 | $ 39,155

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