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Fair Value (Reconciliation of assets and liabilities using significant unobservable inputs (Level 3)) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Sale of instruments       $ 0
Fair Value, Measurements, Recurring [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 50,627 62,526 57,721 48,428
Gains (losses) included in earnings (29) 158 15 401
Changes in fair value of investment securities available for sale included in other comprehensive income (2,247) 667 481 4,084
New instruments acquired 499 628 919 10,887
Principal repayments (223) 0 (442) (481)
Amortization 107 1,269 484 1,937
Sale of instruments 0 0 (10,530) 0
Changes in fair value of servicing assets (207) (579) (121) (587)
Balance 48,527 64,669 48,527 64,669
Fair Value, Measurements, Recurring [Member] | CLO's [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 0 16,380 10,530 16,143
Gains (losses) included in earnings 0 0 0 0
Changes in fair value of investment securities available for sale included in other comprehensive income 0 1,104 0 1,341
New instruments acquired 0 0 0 0
Principal repayments 0 0 0 0
Amortization 0 0 0 0
Sale of instruments 0 0 (10,530) 0
Changes in fair value of servicing assets 0 0 0 0
Balance 0 17,484 0 17,484
Fair Value, Measurements, Recurring [Member] | CMO's [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 29,643 28,782 26,758 25,550
Gains (losses) included in earnings 0 0 0 0
Changes in fair value of investment securities available for sale included in other comprehensive income (2,381) (554) 488 2,678
New instruments acquired 0 0 0 0
Principal repayments 18 0 34 0
Amortization 0 1 0 1
Sale of instruments 0 0 0 0
Changes in fair value of servicing assets 0 0 0 0
Balance 27,280 28,229 27,280 28,229
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 9,882 9,953 10,024 0
Gains (losses) included in earnings 0 0 0 0
Changes in fair value of investment securities available for sale included in other comprehensive income 134 117 (7) 65
New instruments acquired 0 0 0 10,005
Principal repayments 0 0 0 0
Amortization 0 (2) (1) (2)
Sale of instruments 0 0 0 0
Changes in fair value of servicing assets 0 0 0 0
Balance 10,016 10,068 10,016 10,068
Fair Value, Measurements, Recurring [Member] | Derivative asset (S&P Purchased Options) [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 12,515 11,764 9,317 9,870
Gains (losses) included in earnings (1,148) (64) 2,050 1,685
Changes in fair value of investment securities available for sale included in other comprehensive income 0 0 0 0
New instruments acquired 0 225 0 370
Principal repayments 0 0 0 0
Amortization 0 0 0 0
Sale of instruments 0 0 0 0
Changes in fair value of servicing assets 0 0 0 0
Balance 11,367 11,925 11,367 11,925
Fair Value, Measurements, Recurring [Member] | Servicing Assets [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 10,725 9,963 10,454 9,695
Gains (losses) included in earnings 0 0 0 0
Changes in fair value of investment securities available for sale included in other comprehensive income 0 0 0 0
New instruments acquired 499 693 919 1,213
Principal repayments (241) 0 (476) (481)
Amortization 0 (237) 0 0
Sale of instruments 0 0 0 0
Changes in fair value of servicing assets (207) (579) (121) (587)
Balance 10,776 9,840 10,776 9,840
Fair Value, Measurements, Recurring [Member] | Derivative liability (S&P Embedded Options) [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance (12,138) (14,316) (9,362) (12,830)
Gains (losses) included in earnings 1,119 222 (2,035) (1,284)
Changes in fair value of investment securities available for sale included in other comprehensive income 0 0 0 0
New instruments acquired 0 (290) 0 (701)
Principal repayments 0 0 0 0
Amortization 107 1,507 485 1,938
Sale of instruments 0 0 0  
Changes in fair value of servicing assets 0 0 0 0
Balance $ (10,912) $ (12,877) $ (10,912) $ (12,877)