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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 176,941 $ 169,247 $ 169,410 $ 176,084
Loans and leases charged off (10,128) (6,883) (20,208) (55,440)
Recoveries of loans and leases previously charged off 3,814 3,842 11,300 8,475
Net loans and leases charged off (6,314) (3,041) (8,908) (46,965)
Provision for credit losses 2,170 1,620 12,295 38,707
Balance at end of period $ 172,797 $ 167,826 $ 172,797 $ 167,826