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FDIC Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
FDIC Indemnification Asset [Roll Forward]        
Balance $ 143,660 $ 253,379 $ 189,240 $ 302,295
Indemnification agreements reimbursements from the FDIC (12,837) (14,036) (31,537) (32,732)
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 1,597 (510) 5,159 (2,525)
FDIC indemnification asset, expense (16,059) (15,198) (51,180) (46,623)
Incurred expenses to be reimbursed under shared-loss agreements 4,258 1,947 8,937 5,167
Balance 120,619 225,582 120,619 225,582
True-up payment obligation [Roll Forward]        
Balance 20,231 16,907 18,510 15,496
Change in true-up payment obligation expense 875 767 2,596 2,178
Balance $ 21,106 $ 17,674 $ 21,106 $ 17,674