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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 169,247 $ 174,998 $ 176,084 $ 171,325
Loans charged off (6,883) (7,795) (55,440) (25,917)
Recoveries of loans previously charged off 3,842 2,471 8,475 12,766
Net loans charged off (3,041) (5,324) (46,965) (13,151)
Provision for credit losses 1,620 5,075 38,707 16,575
Balance at end of period $ 167,826 $ 174,749 $ 167,826 $ 174,749