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Investment Securities (Schedule of Preferred Security and Associated Ratings) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 417,470 |  | $ 482,440
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 8,036 |  | 16,316
Available-for-sale Securities, Fair Value | 419,773 |  | 496,815
Countrywide Capital IV [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,770 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 2 |  |
Available-for-sale Securities, Fair Value | 1,772 |  |
Number of banks currently performing | 1 |  |
Countrywide Capital IV [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Countrywide Capital V [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 2,747 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 21 |  |
Available-for-sale Securities, Fair Value | 2,768 |  |
Number of banks currently performing | 1 |  |
Countrywide Capital V [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Countrywide Capital V [Member] | Additional Deal Value [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 250 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 2 |  |
Available-for-sale Securities, Fair Value | 252 |  |
Number of banks currently performing | 1 |  |
Countrywide Capital V [Member] | Additional Deal Value [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Citigroup Cap IX [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 992 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 9 |  |
Available-for-sale Securities, Fair Value | 1,001 |  |
Number of banks currently performing | 1 |  |
Citigroup Cap IX [Member] | Standard & Poor's, BB Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB |  |
Citigroup Cap IX [Member] | Additional Deal Value [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,906 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 25 |  |
Available-for-sale Securities, Fair Value | 1,931 |  |
Number of banks currently performing | 1 |  |
Citigroup Cap IX [Member] | Additional Deal Value [Member] | Standard & Poor's, BB Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB |  |
Citigroup Cap XI [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 246 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 3 |  |
Available-for-sale Securities, Fair Value | 249 |  |
Number of banks currently performing | 1 |  |
Citigroup Cap XI [Member] | Standard & Poor's, BB Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB |  |
Nationsbank Cap Trust III [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,573 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (313) |  |
Available-for-sale Securities, Fair Value | 1,260 |  |
Number of banks currently performing | 1 |  |
Nationsbank Cap Trust III [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Morgan Stanley Cap Trust IV [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 2,500 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (10) |  |
Available-for-sale Securities, Fair Value | 2,490 |  |
Number of banks currently performing | 1 |  |
Morgan Stanley Cap Trust IV [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Morgan Stanley Cap Trust IV [Member] | Additional Deal Value [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,742 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 0 |  |
Available-for-sale Securities, Fair Value | 1,742 |  |
Number of banks currently performing | 1 |  |
Morgan Stanley Cap Trust IV [Member] | Additional Deal Value [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Saturns - GS 2004-04 [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 535 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 11 |  |
Available-for-sale Securities, Fair Value | 546 |  |
Number of banks currently performing | 1 |  |
Saturns - GS 2004-04 [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Goldman Sachs [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,000 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (47) |  |
Available-for-sale Securities, Fair Value | 953 |  |
Number of banks currently performing | 1 |  |
Goldman Sachs [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | BB+ |  |
Stifel Financial [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 4,500 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | 151 |  |
Available-for-sale Securities, Fair Value | 4,651 |  |
Debt Instrument, Credit Rating | BBB- |  |
Number of banks currently performing | 1 |  |
ALESCO Preferred Funding VII [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 859 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) | (787) |  |
Available-for-sale Securities, Fair Value | $ 72 |  |
Deferral and Defaults as a percentage of collateral | 35.90% |  |
Expected deferral default as a percent of remaining performing colleteral | 34.50% |  |
ALESCO Preferred Funding VII [Member] | Ca Rating [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Instrument, Credit Rating | Ca |  |
ALESCO Preferred Funding VII [Member] | Maximum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Number of banks currently performing | 61 | [1] |
ALESCO Preferred Funding VII [Member] | Minimum [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Number of banks currently performing | 47 | [1] |
[1] | Includes banks and insurance companies.

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