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Investment Securities (Unrealized Gains) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | $ 417,470 | $ 482,440
Investment Securities Available-for-Sale: Unrealized Gains | 8,036 | 16,316
Investment Securities Available-for-Sale: Unrealized Losses | (5,733) | (1,941)
Investment securities: Available-for-sale | 419,773 | 496,815
Investment Securities Held-to-Maturity: Amortized Cost | 136,786 | 58,064
Investment Securities Held-to-Maturity: Unrealized Gains | 2,113 | 4,372
Investment Securities Held-to-Maturity: Unrealized Losses | (3,545) | (5)
Investment Securities Held-to-Maturity: Fair Value | 135,354 | 62,431
Total investment securities, amortized cost | 554,256 | 540,504
Total investment securities, gross unrealized gains | 10,149 | 20,688
Total investment securities, gross unrealized losses | (9,278) | (1,946)
Total investment securities, fair value | 555,127 | 559,246
U.S. treasury notes [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 43,450 | 11,870
Investment Securities Available-for-Sale: Unrealized Gains | 0 | 62
Investment Securities Available-for-Sale: Unrealized Losses | (1,312) | (23)
Investment securities: Available-for-sale | 42,138 | 11,909
Federal agency obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 14,265 | 20,207
Investment Securities Available-for-Sale: Unrealized Gains | 30 | 333
Investment Securities Available-for-Sale: Unrealized Losses | (437) | (5)
Investment securities: Available-for-sale | 13,858 | 20,535
Investment Securities Held-to-Maturity: Amortized Cost | 3,698 | 4,178
Investment Securities Held-to-Maturity: Unrealized Gains | 68 | 79
Investment Securities Held-to-Maturity: Unrealized Losses | 0 | 0
Investment Securities Held-to-Maturity: Fair Value | 3,766 | 4,257
Residential mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 48,925 | 52,400
Investment Securities Available-for-Sale: Unrealized Gains | 682 | 1,385
Investment Securities Available-for-Sale: Unrealized Losses | (221) | (1)
Investment securities: Available-for-sale | 49,386 | 53,784
Commercial mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 9,709 | 9,725
Investment Securities Available-for-Sale: Unrealized Gains | 0 | 244
Investment Securities Available-for-Sale: Unrealized Losses | (288) | 0
Investment securities: Available-for-sale | 9,421 | 9,969
Investment Securities Held-to-Maturity: Amortized Cost | 4,965 | 5,501
Investment Securities Held-to-Maturity: Unrealized Gains | 0 | 154
Investment Securities Held-to-Maturity: Unrealized Losses | (98) | (5)
Investment Securities Held-to-Maturity: Fair Value | 4,867 | 5,650
Obligations of U.S. states and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 39,341 | 103,193
Investment Securities Available-for-Sale: Unrealized Gains | 1,092 | 4,653
Investment Securities Available-for-Sale: Unrealized Losses | (25) | (132)
Investment securities: Available-for-sale | 40,408 | 107,714
Investment Securities Held-to-Maturity: Amortized Cost | 118,032 | 48,385
Investment Securities Held-to-Maturity: Unrealized Gains | 2,045 | 4,139
Investment Securities Held-to-Maturity: Unrealized Losses | (3,365) | 0
Investment Securities Held-to-Maturity: Fair Value | 116,712 | 52,524
Trust preferred securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 20,620 | 22,279
Investment Securities Available-for-Sale: Unrealized Gains | 224 | 144
Investment Securities Available-for-Sale: Unrealized Losses | (1,157) | (1,174)
Investment securities: Available-for-sale | 19,687 | 21,249
Investment Securities Held-to-Maturity: Amortized Cost | 10,091 |
Investment Securities Held-to-Maturity: Unrealized Gains | 0 |
Investment Securities Held-to-Maturity: Unrealized Losses | (82) |
Investment Securities Held-to-Maturity: Fair Value | 10,009 |
Corporate bonds and notes [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 215,263 | 228,681
Investment Securities Available-for-Sale: Unrealized Gains | 5,667 | 9,095
Investment Securities Available-for-Sale: Unrealized Losses | (2,128) | (371)
Investment securities: Available-for-sale | 218,802 | 237,405
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost |  | 2,120
Investment Securities Available-for-Sale: Unrealized Gains | 24 | 0
Investment Securities Available-for-Sale: Unrealized Losses |  | 0
Investment securities: Available-for-sale |  | 2,120
Asset-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 19,038 | 19,431
Investment Securities Available-for-Sale: Unrealized Gains | 243 | 311
Investment Securities Available-for-Sale: Unrealized Losses | 0 | 0
Investment securities: Available-for-sale | 19,281 | 19,742
Certificates of Deposit [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 2,402 | 2,854
Investment Securities Available-for-Sale: Unrealized Gains | 30 | 21
Investment Securities Available-for-Sale: Unrealized Losses | (29) | (10)
Investment securities: Available-for-sale | 2,403 | 2,865
Equity securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 376 | 535
Investment Securities Available-for-Sale: Unrealized Gains | 0 | 0
Investment Securities Available-for-Sale: Unrealized Losses | (121) | (210)
Investment securities: Available-for-sale | 255 | 325
Other securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Amortized cost | 4,081 | 9,145
Investment Securities Available-for-Sale: Unrealized Gains | 68 | 68
Investment Securities Available-for-Sale: Unrealized Losses | (15) | (15)
Investment securities: Available-for-sale | $ 4,134 | $ 9,198

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