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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]    
Balance at beginning of period $ 176,084 $ 171,325
Loans charged off (6,397) (9,407)
Recoveries of loans previously charged off 2,362 5,929
Net loans charged off (4,035) (3,478)
Provision for credit losses 3,970 4,800
Balance at end of period $ 176,019 $ 172,647