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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, 2019
Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]    
Balance at beginning of period $ 169,410 $ 176,084
Loans and leases charged off (6,369) (6,397)
Recoveries of loans and leases previously charged off 2,231 2,362
Net loans and leases charged off (4,138) (4,035)
Provision for credit losses 5,100 3,970
Balance at end of period $ 170,372 $ 176,019