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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Balance at beginning of year $ 176,084 $ 171,325 $ 171,412
Loans charged off (66,076) (33,290) (33,927)
Recoveries of loans previously charged off 12,495 14,744 20,658
Net loans charged off (53,581) (18,546) (13,269)
Provision for credit losses 46,907 23,305 13,182
Balance at end of year $ 169,410 $ 176,084 $ 171,325