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Securities (Trust Preferred Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Schedule Of Securities [Line Items]    
Amortized Cost $ 1,101,523 $ 645,658
Securities Available For Sale, Fair Value 1,097,801 640,571
Available-for-sale, Unrealized Loss (15,911) (14,916)
Securities held to maturity fair value, Amortized Cost 1,178,558 917,212
Securities held to maturity, fair value 1,212,826 952,033
Single Issuer TPS, Fair Value 7,786  
TPS, Current Par Value 114,173  
TPS, Amortized Cost 46,867  
TPS, Fair Value 31,978  
TPS, Unrealized Loss (14,889)  
TPS, Number Of Issuers Currently Performing 1,030  
Pooled TPS P1 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,500  
Amortized Cost 2,312  
Securities Available For Sale, Fair Value 958  
Available-for-sale, Unrealized Loss (1,354)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 43  
Actual Defaults (as a percent of original collateral) 21.00%  
Actual Deferrals (as a percent of original collateral) 13.00%  
Projected Recovery Rates on Current Deferrals 41.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P2 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 4,889  
Amortized Cost 2,794  
Securities Available For Sale, Fair Value 785  
Available-for-sale, Unrealized Loss (2,009)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 44  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 14.00%  
Projected Recovery Rates on Current Deferrals 30.00% [1]  
Expected Defaults 12.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P3 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,561  
Amortized Cost 4,218  
Securities Available For Sale, Fair Value 1,145  
Available-for-sale, Unrealized Loss (3,073)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 46  
Actual Defaults (as a percent of original collateral) 13.00%  
Actual Deferrals (as a percent of original collateral) 10.00%  
Projected Recovery Rates on Current Deferrals 33.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P4 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 3,994  
Amortized Cost 2,891  
Securities Available For Sale, Fair Value 822  
Available-for-sale, Unrealized Loss (2,069)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 51  
Actual Defaults (as a percent of original collateral) 15.00%  
Actual Deferrals (as a percent of original collateral) 9.00%  
Projected Recovery Rates on Current Deferrals 38.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P5 [Member]
    
Schedule Of Securities [Line Items]    
Class MEZ  
Current Par Value 474  
Amortized Cost 297  
Securities Available For Sale, Fair Value 215  
Available-for-sale, Unrealized Loss (82)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 14  
Actual Defaults (as a percent of original collateral) 19.00%  
Actual Deferrals (as a percent of original collateral) 7.00%  
Projected Recovery Rates on Current Deferrals 75.00% [1]  
Expected Defaults 10.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P6 [Member]
    
Schedule Of Securities [Line Items]    
Class MEZ  
Current Par Value 1,909  
Amortized Cost 999  
Securities Available For Sale, Fair Value 571  
Available-for-sale, Unrealized Loss (428)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 14  
Actual Defaults (as a percent of original collateral) 21.00%  
Actual Deferrals (as a percent of original collateral) 15.00%  
Projected Recovery Rates on Current Deferrals 39.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P7 [Member]
    
Schedule Of Securities [Line Items]    
Class B3  
Current Par Value 2,000  
Amortized Cost 726  
Securities Available For Sale, Fair Value 319  
Available-for-sale, Unrealized Loss (407)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 19  
Actual Defaults (as a percent of original collateral) 29.00%  
Actual Deferrals (as a percent of original collateral) 13.00%  
Projected Recovery Rates on Current Deferrals 47.00% [1]  
Expected Defaults 10.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P8 [Member]
    
Schedule Of Securities [Line Items]    
Class B1  
Current Par Value 3,028  
Amortized Cost 2,386  
Securities Available For Sale, Fair Value 682  
Available-for-sale, Unrealized Loss (1,704)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 49  
Actual Defaults (as a percent of original collateral) 14.00%  
Actual Deferrals (as a percent of original collateral) 21.00%  
Projected Recovery Rates on Current Deferrals 41.00% [1]  
Expected Defaults 12.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P9 [Member]
    
Schedule Of Securities [Line Items]    
Class C  
Current Par Value 5,048  
Amortized Cost 756  
Securities Available For Sale, Fair Value 238  
Available-for-sale, Unrealized Loss (518)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 33  
Actual Defaults (as a percent of original collateral) 14.00%  
Actual Deferrals (as a percent of original collateral) 31.00%  
Projected Recovery Rates on Current Deferrals 42.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P10 [Member]
    
Schedule Of Securities [Line Items]    
Class C  
Current Par Value 507  
Amortized Cost 461  
Securities Available For Sale, Fair Value 63  
Available-for-sale, Unrealized Loss (398)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 47  
Actual Defaults (as a percent of original collateral) 13.00%  
Actual Deferrals (as a percent of original collateral) 19.00%  
Projected Recovery Rates on Current Deferrals 31.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P11 [Member]
    
Schedule Of Securities [Line Items]    
Class C  
Current Par Value 2,010  
Amortized Cost 788  
Securities Available For Sale, Fair Value 112  
Available-for-sale, Unrealized Loss (676)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 39  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 17.00%  
Projected Recovery Rates on Current Deferrals 42.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P12 [Member]
    
Schedule Of Securities [Line Items]    
Class A4L  
Current Par Value 2,000  
Amortized Cost 645  
Securities Available For Sale, Fair Value 132  
Available-for-sale, Unrealized Loss (513)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 22  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 26.00%  
Projected Recovery Rates on Current Deferrals 53.00% [1]  
Expected Defaults 12.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Total OTTI [Member]
    
Schedule Of Securities [Line Items]    
Class Total OTTI  
Current Par Value 36,920  
Amortized Cost 19,273  
Securities Available For Sale, Fair Value 6,042  
Available-for-sale, Unrealized Loss (13,231)  
Number of Issuers Currently Performing 421  
Actual Defaults (as a percent of original collateral) 17.00%  
Actual Deferrals (as a percent of original collateral) 16.00%  
Projected Recovery Rates on Current Deferrals 40.00% [1]  
Expected Defaults 12.00% [2]  
Pooled TPS P13 [Member]
    
Schedule Of Securities [Line Items]    
Class SNR  
Current Par Value 1,506  
Amortized Cost 1,564  
Securities Available For Sale, Fair Value 1,387  
Available-for-sale, Unrealized Loss (177)  
Lowest Credit Ratings BBB  
Number of Issuers Currently Performing 11  
Actual Defaults (as a percent of original collateral) 15.00%  
Actual Deferrals (as a percent of original collateral) 14.00%  
Projected Recovery Rates on Current Deferrals 43.00% [1]  
Expected Defaults 10.00% [2]  
Excess Subordination (as a percent of current collateral) 77.27% [3]  
Pooled TPS P14 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,219  
Amortized Cost 866  
Securities Available For Sale, Fair Value 909  
Available-for-sale, Unrealized Loss 43  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 43  
Actual Defaults (as a percent of original collateral) 21.00%  
Actual Deferrals (as a percent of original collateral) 13.00%  
Projected Recovery Rates on Current Deferrals 41.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P15 [Member]
    
Schedule Of Securities [Line Items]    
Class A2A  
Current Par Value 5,000  
Amortized Cost 1,995  
Securities Available For Sale, Fair Value 1,948  
Available-for-sale, Unrealized Loss (47)  
Lowest Credit Ratings CCC  
Number of Issuers Currently Performing 44  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 14.00%  
Projected Recovery Rates on Current Deferrals 30.00% [1]  
Expected Defaults 12.00% [2]  
Excess Subordination (as a percent of current collateral) 43.23% [3]  
Pooled TPS P16 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 4,781  
Amortized Cost 1,064  
Securities Available For Sale, Fair Value 985  
Available-for-sale, Unrealized Loss (79)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 46  
Actual Defaults (as a percent of original collateral) 13.00%  
Actual Deferrals (as a percent of original collateral) 10.00%  
Projected Recovery Rates on Current Deferrals 33.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P17 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,260  
Amortized Cost 1,010  
Securities Available For Sale, Fair Value 1,083  
Available-for-sale, Unrealized Loss 73  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 51  
Actual Defaults (as a percent of original collateral) 15.00%  
Actual Deferrals (as a percent of original collateral) 9.00%  
Projected Recovery Rates on Current Deferrals 38.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P18 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,190  
Amortized Cost 837  
Securities Available For Sale, Fair Value 706  
Available-for-sale, Unrealized Loss (131)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 56  
Actual Defaults (as a percent of original collateral) 14.00%  
Actual Deferrals (as a percent of original collateral) 18.00%  
Projected Recovery Rates on Current Deferrals 33.00% [1]  
Expected Defaults 14.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P19 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 3,206  
Amortized Cost 320  
Securities Available For Sale, Fair Value 173  
Available-for-sale, Unrealized Loss (147)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 42  
Actual Defaults (as a percent of original collateral) 19.00%  
Actual Deferrals (as a percent of original collateral) 15.00%  
Projected Recovery Rates on Current Deferrals 37.00% [1]  
Expected Defaults 14.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P20 [Member]
    
Schedule Of Securities [Line Items]    
Class C  
Current Par Value 3,339  
Amortized Cost 504  
Securities Available For Sale, Fair Value 618  
Available-for-sale, Unrealized Loss 114  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 35  
Actual Defaults (as a percent of original collateral) 15.00%  
Actual Deferrals (as a percent of original collateral) 19.00%  
Projected Recovery Rates on Current Deferrals 33.00% [1]  
Expected Defaults 15.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P21 [Member]
    
Schedule Of Securities [Line Items]    
Class B  
Current Par Value 2,069  
Amortized Cost 559  
Securities Available For Sale, Fair Value 549  
Available-for-sale, Unrealized Loss (10)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 34  
Actual Defaults (as a percent of original collateral) 12.00%  
Actual Deferrals (as a percent of original collateral) 25.00%  
Projected Recovery Rates on Current Deferrals 33.00% [1]  
Expected Defaults 16.00% [2]  
Excess Subordination (as a percent of current collateral) 20.04% [3]  
Pooled TPS P22 [Member]
    
Schedule Of Securities [Line Items]    
Class B2  
Current Par Value 5,000  
Amortized Cost 2,145  
Securities Available For Sale, Fair Value 2,176  
Available-for-sale, Unrealized Loss 31  
Lowest Credit Ratings CCC  
Number of Issuers Currently Performing 21  
Actual Defaults (as a percent of original collateral) 0.00%  
Actual Deferrals (as a percent of original collateral) 8.00%  
Projected Recovery Rates on Current Deferrals 10.00% [1]  
Expected Defaults 10.00% [2]  
Excess Subordination (as a percent of current collateral) 41.76% [3]  
Pooled TPS P23 [Member]
    
Schedule Of Securities [Line Items]    
Class MEZ  
Current Par Value 1,894  
Amortized Cost 567  
Securities Available For Sale, Fair Value 566  
Available-for-sale, Unrealized Loss (1)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 14  
Actual Defaults (as a percent of original collateral) 21.00%  
Actual Deferrals (as a percent of original collateral) 15.00%  
Projected Recovery Rates on Current Deferrals 39.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P24 [Member]
    
Schedule Of Securities [Line Items]    
Class B2  
Current Par Value 1,000  
Amortized Cost 268  
Securities Available For Sale, Fair Value 270  
Available-for-sale, Unrealized Loss 2  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 47  
Actual Defaults (as a percent of original collateral) 13.00%  
Actual Deferrals (as a percent of original collateral) 15.00%  
Projected Recovery Rates on Current Deferrals 27.00% [1]  
Expected Defaults 14.00% [2]  
Excess Subordination (as a percent of current collateral) 3.30% [3]  
Pooled TPS P25 [Member]
    
Schedule Of Securities [Line Items]    
Class B  
Current Par Value 4,008  
Amortized Cost 895  
Securities Available For Sale, Fair Value 933  
Available-for-sale, Unrealized Loss 38  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 39  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 17.00%  
Projected Recovery Rates on Current Deferrals 42.00% [1]  
Expected Defaults 13.00% [2]  
Excess Subordination (as a percent of current collateral) 10.49% [3]  
Pooled TPS P26 [Member]
    
Schedule Of Securities [Line Items]    
Class SNR  
Current Par Value 4,344  
Amortized Cost 2,534  
Securities Available For Sale, Fair Value 2,511  
Available-for-sale, Unrealized Loss (23)  
Lowest Credit Ratings CCC  
Number of Issuers Currently Performing 50  
Actual Defaults (as a percent of original collateral) 21.00%  
Actual Deferrals (as a percent of original collateral) 7.00%  
Projected Recovery Rates on Current Deferrals 40.00% [1]  
Expected Defaults 12.00% [2]  
Excess Subordination (as a percent of current collateral) 48.61% [3]  
Pooled TPS P27 [Member]
    
Schedule Of Securities [Line Items]    
Class B  
Current Par Value 5,000  
Amortized Cost 1,195  
Securities Available For Sale, Fair Value 1,202  
Available-for-sale, Unrealized Loss 7  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 17  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 8.00%  
Projected Recovery Rates on Current Deferrals 32.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P28 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,531  
Amortized Cost 1,120  
Securities Available For Sale, Fair Value 1,015  
Available-for-sale, Unrealized Loss (105)  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 27  
Actual Defaults (as a percent of original collateral) 15.00%  
Actual Deferrals (as a percent of original collateral) 13.00%  
Projected Recovery Rates on Current Deferrals 41.00% [1]  
Expected Defaults 10.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Pooled TPS P29 [Member]
    
Schedule Of Securities [Line Items]    
Class C1  
Current Par Value 5,606  
Amortized Cost 1,008  
Securities Available For Sale, Fair Value 1,119  
Available-for-sale, Unrealized Loss 111  
Lowest Credit Ratings C  
Number of Issuers Currently Performing 26  
Actual Defaults (as a percent of original collateral) 16.00%  
Actual Deferrals (as a percent of original collateral) 13.00%  
Projected Recovery Rates on Current Deferrals 48.00% [1]  
Expected Defaults 11.00% [2]  
Excess Subordination (as a percent of current collateral) 0.00% [3]  
Total Not OTTI [Member]
    
Schedule Of Securities [Line Items]    
Securities held to maturity, Class Total Not OTTI  
Securities held to maturity, Current Par Value 67,953  
Securities held to maturity fair value, Amortized Cost 18,451  
Securities held to maturity, fair value 18,150  
Securities Held to Maturity, Unrealized Loss (301)  
Securities held to maturity, Number of Issuers Currently Performing 603  
Securities held to maturity, Actual Defaults (as a percent of original collateral) 15.00%  
Securities held to maturity, Actual Deferrals (as a percent of original collateral) 13.00%  
Securities held to maturity, Projected Recovery Rates on Current Deferrals 35.00% [1]  
Securities held to maturity, Expected Defaults 13.00% [2]  
Total Pooled TPS [Member]
    
Schedule Of Securities [Line Items]    
Securities held to maturity, Class Total Pooled TPS  
Securities held to maturity, Current Par Value 104,873  
Securities held to maturity fair value, Amortized Cost 37,724  
Securities held to maturity, fair value 24,192  
Securities Held to Maturity, Unrealized Loss (13,532)  
Securities held to maturity, Number of Issuers Currently Performing 1,024  
Securities held to maturity, Actual Defaults (as a percent of original collateral) 16.00%  
Securities held to maturity, Actual Deferrals (as a percent of original collateral) 14.00%  
Securities held to maturity, Projected Recovery Rates on Current Deferrals 38.00% [1]  
Securities held to maturity, Expected Defaults 12.00% [2]  
Single Issuer TPS [Member]
    
Schedule Of Securities [Line Items]    
Single Issuer TPS, Current Par Value 9,300  
Single Issuer TPS, Amortized cost 9,143  
Single Issuer TPS, Fair Value 7,786  
Single Issuer TPS, Unrealized Loss (1,357)  
Single Issuer TPS, Number Of Issuers Currently Performing 6  
Single Issuer TPS S1 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BB  
Single Issuer TPS, Current Par Value 2,000  
Single Issuer TPS, Amortized cost 1,950  
Single Issuer TPS, Fair Value 1,400  
Single Issuer TPS, Unrealized Loss (550)  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Single Issuer TPS S2 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BBB  
Single Issuer TPS, Current Par Value 2,000  
Single Issuer TPS, Amortized cost 1,916  
Single Issuer TPS, Fair Value 1,522  
Single Issuer TPS, Unrealized Loss (394)  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Single Issuer TPS S3 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BB-  
Single Issuer TPS, Current Par Value 1,000  
Single Issuer TPS, Amortized cost 954  
Single Issuer TPS, Fair Value 1,018  
Single Issuer TPS, Unrealized Loss 64  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Single Issuer TPS S4 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BB  
Single Issuer TPS, Current Par Value 2,000  
Single Issuer TPS, Amortized cost 2,000  
Single Issuer TPS, Fair Value 1,840  
Single Issuer TPS, Unrealized Loss (160)  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Single Issuer TPS S5 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BB  
Single Issuer TPS, Current Par Value 1,000  
Single Issuer TPS, Amortized cost 999  
Single Issuer TPS, Fair Value 705  
Single Issuer TPS, Unrealized Loss (294)  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Single Issuer TPS S6 [Member]
    
Schedule Of Securities [Line Items]    
Lowest Credit Ratings BB  
Single Issuer TPS, Current Par Value 1,300  
Single Issuer TPS, Amortized cost 1,324  
Single Issuer TPS, Fair Value 1,301  
Single Issuer TPS, Unrealized Loss $ (23)  
Single Issuer TPS, Number Of Issuers Currently Performing 1  
Maximum [Member]
    
Schedule Of Securities [Line Items]    
Deferral rate after five years 90.00%  
Minimum [Member]
    
Schedule Of Securities [Line Items]    
Deferral rate after five years 10.00%  
[1] Some current deferrals will cure at rates varying from 10% to 90% after five years.
[2] Expected future defaults as a percent of remaining performing collateral.
[3] Excess subordination represents the additional defaults in excess of both current and projected defaults that the CDO can absorb before the bond experiences any credit impairment.