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Investment Securities (Schedule of Unrealized Losses Not Recognized in Income) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | $ 130,084 | $ 54,492
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (4,466) | (323)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 4,539 | 10,752
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | (1,267) | (1,618)
Investment Securities Available-for-Sale: Total, fair value | 134,623 | 65,244
Investment Securities Available-for-Sale: Total, unrealized losses | (5,733) | (1,941)
Investment Securities Held-to-Maturity: Less than 12 months, fair value | 81,419 | 932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses | (3,539) | (5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value | 468 | 0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses | (6) | 0
Investment Securities Held-to-Maturity: Total, fair value | 81,887 | 932
Investment Securities Held-to-Maturity: Total, unrealized losses | (3,545) | (5)
Temporarily Impaired Securities, Total Fair Value | 216,510 | 66,176
Temporarily Impaired Securities, Total Unrealized Losses | (9,278) | (1,946)
Temporarily Impaired Securities, Less than 12 Months, Fair Value | 211,503 | 55,424
Temporarily Impaired Securities, Less than 12 Months, unrealized losses | (8,005) | (328)
Temporarily Impaired Securities, 12 months or longer, Fair Value | 5,007 | 10,752
Temporarily Impaired Securities, 12 months or longer, Aggregate losses | (1,273) | (1,618)
U.S. treasury notes [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 42,138 | 4,460
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (1,312) | (23)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 | 0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: Total, fair value | 42,138 | 4,460
Investment Securities Available-for-Sale: Total, unrealized losses | (1,312) | (23)
Federal agency obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 9,709 | 877
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (437) | (5)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 | 0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: Total, fair value | 9,709 | 877
Investment Securities Available-for-Sale: Total, unrealized losses | (437) | (5)
Commercial mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 9,421 |
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (288) |
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 |
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 |
Investment Securities Available-for-Sale: Total, fair value | 9,421 |
Investment Securities Available-for-Sale: Total, unrealized losses | (288) |
Investment Securities Held-to-Maturity: Less than 12 months, fair value | 4,399 | 932
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses | (92) | (5)
Investment Securities Held-to-Maturity: 12 months or longer, fair value | 468 | 0
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses | (6) | 0
Investment Securities Held-to-Maturity: Total, fair value | 4,867 | 932
Investment Securities Held-to-Maturity: Total, unrealized losses | (98) | (5)
Residential mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 10,045 | 1,669
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (221) | (1)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 | 0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: Total, fair value | 10,045 | 1,669
Investment Securities Available-for-Sale: Total, unrealized losses | (221) | (1)
Obligations of U.S. states and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 2,226 | 18,360
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (25) | (132)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 | 0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: Total, fair value | 2,226 | 18,360
Investment Securities Available-for-Sale: Total, unrealized losses | (25) | (132)
Investment Securities Held-to-Maturity: Less than 12 months, fair value | 67,011 |
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses | (3,365) |
Investment Securities Held-to-Maturity: 12 months or longer, fair value | 0 |
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses | 0 |
Investment Securities Held-to-Maturity: Total, fair value | 67,011 |
Investment Securities Held-to-Maturity: Total, unrealized losses | (3,365) |
Trust preferred securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 5,184 | 10,494
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (58) | (18)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 1,333 | 1,246
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | (1,099) | (1,156)
Investment Securities Available-for-Sale: Total, fair value | 6,517 | 11,740
Investment Securities Available-for-Sale: Total, unrealized losses | (1,157) | (1,174)
Corporate bonds and notes [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 50,554 | 18,244
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (2,096) | (134)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 1,966 | 8,196
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | (32) | (237)
Investment Securities Available-for-Sale: Total, fair value | 52,520 | 26,440
Investment Securities Available-for-Sale: Total, unrealized losses | (2,128) | (371)
Investment Securities Held-to-Maturity: Less than 12 months, fair value | 10,009 |
Investment Securities Held-to-Maturity: 12 months or less, unrealized losses | (82) |
Investment Securities Held-to-Maturity: 12 months or longer, fair value | 0 |
Investment Securities Held-to-Maturity: 12 months or longer, unrealized losses | 0 |
Investment Securities Held-to-Maturity: Total, fair value | 10,009 |
Investment Securities Held-to-Maturity: Total, unrealized losses | (82) |
Certificates of Deposit [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 807 | 388
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | (29) | (10)
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 0 | 0
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: Total, fair value | 807 | 388
Investment Securities Available-for-Sale: Total, unrealized losses | (29) | (10)
Equity securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 0 | 0
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 255 | 325
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | (121) | (210)
Investment Securities Available-for-Sale: Total, fair value | 255 | 325
Investment Securities Available-for-Sale: Total, unrealized losses | (121) | (210)
Other securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Less than 12 months, fair value | 0 | 0
Investment Securities Available-for-Sale: Less than 12 months, unrealized losses | 0 | 0
Investment Securities Available-for-Sale: 12 Months or Longer, fair value | 985 | 985
Investment Securities Available-for-Sale: 12 months or longer, unrealized losses | (15) | (15)
Investment Securities Available-for-Sale: Total, fair value | 985 | 985
Investment Securities Available-for-Sale: Total, unrealized losses | $ (15) | $ (15)

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