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Loans and Allowance for Credit Losses Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Receivables [Abstract]            
Allowance for loan losses $ 167,136 $ 167,485 $ 184,144 $ 189,477 $ 191,685 $ 202,780
Reserve for unfunded lending commitments 2,259   1,787      
Allowance for credit losses $ 169,395 $ 169,453 $ 185,931 $ 191,108 $ 193,442 $ 204,917