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Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Lock Commitments [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfers from Level 3 to Level 2 $ 1,900,000    
Investment Securities Available For Sale [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfered assets 501,000    
Beginning balance 6,842,000 6,842,000 10,622,000
Included in earnings   (450,000) [1] 1,000,000 [1]
Unrealized gains (losses) included in other comprehensive income   (713,000) (228,000)
Change from consolidated to equity method investment   0 0
Purchases   0 0
Sales   0 (4,552,000)
Issuances   0 0
Settlements   (2,000,000) 0
Amortization of discount/premium   0 0
Transfers in and/or out of Level 3   (501,000) 0
Ending balance   3,178,000 6,842,000
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,   (450,000) 1,000,000
Private Equity Investments [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance 21,418,000 21,418,000 47,357,000
Included in earnings   8,233,000 [1] (1,118,000) [1]
Unrealized gains (losses) included in other comprehensive income   0 0
Change from consolidated to equity method investment   0 (27,291,000)
Purchases   1,057,000 [2] 2,470,000 [2]
Sales   0 0
Issuances   0 0
Settlements   0 0
Amortization of discount/premium   0 0
Transfers in and/or out of Level 3   0 0
Ending balance   30,708,000 21,418,000
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,   8,233,000 (1,118,000)
Other Derivative Contracts, Net [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance (7,242,000) [3] (7,242,000) [3] (4,180,000) [3]
Included in earnings   (6,304,000) [1],[3] (3,062,000) [1],[3]
Unrealized gains (losses) included in other comprehensive income   0 [3] 0 [3]
Change from consolidated to equity method investment   0 [3] 0 [3]
Purchases   0 [3] 0 [3]
Sales   0 [3] 0 [3]
Issuances   0 [3] 0 [3]
Settlements   12,441,000 [3] 0 [3]
Amortization of discount/premium   0 [3] 0 [3]
Transfers in and/or out of Level 3   (1,851,000) [3] 0 [3]
Ending balance   (2,956,000) [3] (7,242,000) [3]
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,   $ (6,304,000) [3] $ (3,062,000) [3]
[1] Included in earnings as a component of other non-interest income(expense).
[2] Represents additional capital contributed to a private equity investment fund for capital calls.
[3] Other derivative contracts include the Visa Derivative for both years presented and the mortgage derivatives for the year ended December 31, 2011