Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans and leases	$ 128,321	$ 125,098
Loans and leases 90 days or more past due and still accruing	13,761	16,057
Total non-performing loans and leases	142,082	141,155
Other real estate owned (OREO)	4,565	6,831
Total non-performing assets	146,647	$ 147,986
Mortgage Loans in Process of Foreclosure, Amount	$ 9,600