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Investment Securities (Details) - Unrealized gains on investment securities (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | $ 258,198 | $ 319,147
Investment Securities Available-for-Sale, Gross Unrealized Gains | 9,542 | 6,960
Investment Securities Available-for-Sale, Gross Unrealized Losses | (781) | (3,037)
Investment Securities Available-for-Sale, Fair Value | 266,959 | 323,070
Investment Securities Held-to-Maturity, Amortized Cost | 218,159 | 215,286
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 4,791 | 1,516
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (447) | (5,844)
Investment Securities Held-to-Maturity, Fair Value | 222,503 | 210,958
Total, Amortized Cost | 476,357 | 534,433
Total, Gross Unrealized Gains | 14,333 | 8,476
Total, Gross Unrealized Losses | (1,228) | (8,881)
Total, Fair Value | 489,462 | 534,028
US Treasury Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 9,608 | 14,344
Investment Securities Available-for-Sale, Gross Unrealized Losses | (136) | (825)
Investment Securities Available-for-Sale, Fair Value | 9,472 | 13,519
Investment Securities Held-to-Maturity, Amortized Cost | 28,159 | 28,056
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 257 |
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (1,019)
Investment Securities Held-to-Maturity, Fair Value | 28,416 | 27,037
Federal Agency Obligations [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 22,643 | 20,567
Investment Securities Available-for-Sale, Gross Unrealized Gains | 116 | 29
Investment Securities Available-for-Sale, Gross Unrealized Losses | (111) | (655)
Investment Securities Available-for-Sale, Fair Value | 22,648 | 19,941
Investment Securities Held-to-Maturity, Amortized Cost | 22,039 | 15,249
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 166 | 23
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (19) | (389)
Investment Securities Held-to-Maturity, Fair Value | 22,186 | 14,883
Residential Mortgage Backed Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 44,369 | 48,312
Investment Securities Available-for-Sale, Gross Unrealized Gains | 1,563 | 791
Investment Securities Available-for-Sale, Gross Unrealized Losses | (13) | (229)
Investment Securities Available-for-Sale, Fair Value | 45,919 | 48,874
Investment Securities Held-to-Maturity, Amortized Cost | 2,049 | 2,246
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 14 |
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (64)
Investment Securities Held-to-Maturity, Fair Value | 2,063 | 2,182
Commercial Mortgage Backed Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 3,072 | 7,145
Investment Securities Available-for-Sale, Gross Unrealized Gains |  | 3
Investment Securities Available-for-Sale, Gross Unrealized Losses | (51) | (157)
Investment Securities Available-for-Sale, Fair Value | 3,021 | 6,991
Investment Securities Held-to-Maturity, Amortized Cost | 4,341 | 4,417
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 77 | 41
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (18) | (62)
Investment Securities Held-to-Maturity, Fair Value | 4,400 | 4,396
US States and Political Subdivisions Debt Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 6,303 | 30,804
Investment Securities Available-for-Sale, Gross Unrealized Gains | 200 | 711
Investment Securities Available-for-Sale, Gross Unrealized Losses |  | (55)
Investment Securities Available-for-Sale, Fair Value | 6,503 | 31,460
Investment Securities Held-to-Maturity, Amortized Cost | 123,646 | 127,418
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 3,327 | 1,303
Investment Securities Held-to-Maturity, Gross Unrealized Losses | (410) | (3,688)
Investment Securities Held-to-Maturity, Fair Value | 126,563 | 125,033
Trust Preferred Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 16,085 | 19,763
Investment Securities Available-for-Sale, Gross Unrealized Gains | 490 | 150
Investment Securities Available-for-Sale, Gross Unrealized Losses | (239) | (510)
Investment Securities Available-for-Sale, Fair Value | 16,336 | 19,403
Corporate Bonds and Notes [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 132,401 | 154,182
Investment Securities Available-for-Sale, Gross Unrealized Gains | 6,969 | 4,930
Investment Securities Available-for-Sale, Gross Unrealized Losses | (43) | (482)
Investment Securities Available-for-Sale, Fair Value | 139,327 | 158,630
Investment Securities Held-to-Maturity, Amortized Cost | 37,925 | 37,900
Investment Securities Held-to-Maturity, Gross Unrealized Gains | 950 | 149
Investment Securities Held-to-Maturity, Gross Unrealized Losses |  | (622)
Investment Securities Held-to-Maturity, Fair Value | 38,875 | 37,427
Asset-backed Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 15,010 | 15,733
Investment Securities Available-for-Sale, Gross Unrealized Gains | 166 | 246
Investment Securities Available-for-Sale, Fair Value | 15,176 | 15,979
Certificates of Deposit [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 2,099 | 2,250
Investment Securities Available-for-Sale, Gross Unrealized Gains | 38 | 32
Investment Securities Available-for-Sale, Gross Unrealized Losses | (5) | (20)
Investment Securities Available-for-Sale, Fair Value | 2,132 | 2,262
Equity Securities [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 376 | 376
Investment Securities Available-for-Sale, Gross Unrealized Losses | (83) | (89)
Investment Securities Available-for-Sale, Fair Value | 293 | 287
Money Market Funds [Member] |  |
Investment Securities (Details) - Unrealized gains on investment securities [Line Items] |  |
Investment Securities Available-for-Sale, Amortized Cost | 6,232 | 5,671
Investment Securities Available-for-Sale, Gross Unrealized Gains |  | 68
Investment Securities Available-for-Sale, Gross Unrealized Losses | (100) | (15)
Investment Securities Available-for-Sale, Fair Value | $ 6,132 | $ 5,724

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