Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans and leases	$ 120,345	$ 125,098
Loans and leases 90 days or more past due and still accruing	19,593	16,057
Total non-performing loans and leases	139,938	141,155
Other real estate owned (OREO)	6,593	6,831
Total non-performing assets	146,531	$ 147,986
Mortgage Loans in Process of Foreclosure, Amount	$ 14,800