Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans and leases	$ 125,037	$ 125,098
Loans and leases 90 days or more past due and still accruing	14,767	16,057
Total non-performing loans and leases	139,804	141,155
Other real estate owned (OREO)	5,418	6,831
Total non-performing assets	145,222	$ 147,986
Mortgage Loans in Process of Foreclosure, Amount	$ 10,600