Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Non-accrual loans and leases	$ 143,889	$ 137,198
Loans and leases 90 days or more past due and still accruing	8,559	9,929
Total non-performing loans and leases	152,448	147,127
Other real estate owned (OREO)	3,664	4,178
Total non-performing assets	156,112	151,305
Mortgage Loans in Process of Foreclosure, Amount	$ 7,600	$ 8,100