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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 258,057 | $ 281,461
Investment Securities Available-for-Sale, Gross Unrealized Gains | 6,650 | 8,596
Investment Securities Available-for-Sale, Gross Unrealized Losses | (609) | (525)
Investment Securities Available-for-Sale, Fair Value | 264,098 | 289,532
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 232,557 | 224,682
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 5,225 | 6,858
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (577) | (95)
Investment Securities Held-to-Maturity, Fair Value | 237,205 | 231,445
Total, Amortized Cost | 490,614 | 506,143
Total, Gross Unrealized Gains | 11,875 | 15,454
Total, Gross Unrealized Losses | (1,186) | (620)
Total, Fair Value | 501,303 | 520,977
Federal Agency Obligations [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 30,713 | 32,650
Investment Securities Available-for-Sale, Gross Unrealized Gains | 304 | 217
Investment Securities Available-for-Sale, Gross Unrealized Losses | (45) | (50)
Investment Securities Available-for-Sale, Fair Value | 30,972 | 32,817
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 35,146 | 27,103
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 368 | 322
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (140) | (28)
Investment Securities Held-to-Maturity, Fair Value | 35,374 | 27,397
Residential Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 53,624 | 58,836
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,181 | 1,531
Investment Securities Available-for-Sale, Gross Unrealized Losses | (71) | (11)
Investment Securities Available-for-Sale, Fair Value | 54,734 | 60,356
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,751 | 5,955
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 2 | 28
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (28) |
Investment Securities Held-to-Maturity, Fair Value | 4,725 | 5,983
Commercial Mortgage Backed Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 3,012 | 3,042
Investment Securities Available-for-Sale, Gross Unrealized Gains | 11 | 4
Investment Securities Available-for-Sale, Fair Value | 3,023 | 3,046
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 4,188 | 4,266
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 56 | 50
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (1) |
Investment Securities Held-to-Maturity, Fair Value | 4,243 | 4,316
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 8,194 | 8,201
Investment Securities Available-for-Sale, Gross Unrealized Gains | 164 | 205
Investment Securities Available-for-Sale, Fair Value | 8,358 | 8,406
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 119,130 | 120,144
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 3,466 | 4,512
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (277) | (60)
Investment Securities Held-to-Maturity, Fair Value | 122,319 | 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 | 456 | 489
Investment Securities Available-for-Sale, Gross Unrealized Losses | (237) | (269)
Investment Securities Available-for-Sale, Fair Value | 16,306 | 16,306
Corporate Bonds and Notes [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 105,518 | 119,838
Investment Securities Available-for-Sale, Gross Unrealized Gains | 4,386 | 5,950
Investment Securities Available-for-Sale, Gross Unrealized Losses | (66) | (11)
Investment Securities Available-for-Sale, Fair Value | 109,838 | 125,777
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 40,975 | 38,950
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 684 | 1,026
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (131) | (7)
Investment Securities Held-to-Maturity, Fair Value | 41,528 | 39,969
Asset-backed Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 24,592 | 27,393
Investment Securities Available-for-Sale, Gross Unrealized Gains | 103 | 140
Investment Securities Available-for-Sale, Gross Unrealized Losses | (13) | (31)
Investment Securities Available-for-Sale, Fair Value | 24,682 | 27,502
Certificates of Deposit [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,096 | 2,098
Investment Securities Available-for-Sale, Gross Unrealized Gains | 27 | 27
Investment Securities Available-for-Sale, Gross Unrealized Losses | (8) | (2)
Investment Securities Available-for-Sale, Fair Value | 2,115 | 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 | (49) | (69)
Investment Securities Available-for-Sale, Fair Value | 327 | 307
Other Securities [Member] |  |
Investment securities available-for-sale: |  |
Investment Securities Available-for-Sale, Amortized Cost | 13,845 | 12,941
Investment Securities Available-for-Sale, Gross Unrealized Gains | 18 | 33
Investment Securities Available-for-Sale, Gross Unrealized Losses | (120) | (82)
Investment Securities Available-for-Sale, Fair Value | 13,743 | 12,892
US Treasury Securities [Member] |  |
Investment securities held-to-maturity: |  |
Investment Securities Held-to-Maturity, Amortized Cost | 28,367 | 28,264
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 649 | 920
Investment Securities Held-to-Maturity, Fair Value | $ 29,016 | $ 29,184

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