Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Non-accrual loans and leases	$ 133,118	$ 128,572
Loans and leases 90 days or more past due and still accruing	14,598	11,106
Total non-performing loans and leases	147,716	139,678
Other real estate owned (OREO)	7,241	10,518
Total non-performing assets	$ 154,957	$ 150,196