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FDIC Loss Share Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
FDIC Indemnification Asset [Roll Forward]    
Balance $ 189,240 $ 302,295
Shared-loss agreements reimbursements from the FDIC 8,236 6,650
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 40 (1,822)
FDIC shared-loss asset, expense (17,622) (12,201)
Incurred expenses to be reimbursed under shared-loss agreements 2,772 1,502
Balance 166,194 283,124
True-up payment obligation [Roll Forward]    
Balance 18,510 15,496
FDIC shared loss expense 865 670
Balance $ 19,375 $ 16,166