Loans and Allowance for Credit Losses - Non-TDR Loan Modifications due to COVID-19 (Details) - CARES Act Modification $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) deferral	Dec. 31, 2020 USD ($)
Financing Receivable, Modification [Line Items]
Deferrals Balance	$ 39,285	$ 63,902
Number of Deferrals | deferral	305
Commercial and commercial real estate
Financing Receivable, Modification [Line Items]
Deferrals Balance	$ 32,242	53,823
Number of Deferrals | deferral	47
Second deferrals between 90 and 180 days, amount	$ 2,200
Residential real estate
Financing Receivable, Modification [Line Items]
Deferrals Balance	$ 1,763	1,855
Number of Deferrals | deferral	8
Second deferrals between 90 and 180 days, amount	$ 700
Consumer credit
Financing Receivable, Modification [Line Items]
Deferrals Balance	$ 5,280	$ 8,224
Number of Deferrals | deferral	250
Second deferrals between 90 and 180 days, amount	$ 700