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Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Non-accrual loans $ 132,154 $ 121,080
Accruing loans 90 days or more past due 12,867 17,402
Total non-performing loans 145,021 138,482
Other real estate owned (OREO) 10,561 12,022
Total non-performing assets $ 155,582 $ 150,504