Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 37,392	$ 26,490
ACL Allocation	3,209	308
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	36,601	24,380
Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	461	2,000
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	330	110
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	896	795
ACL Allocation	29	122
Commercial and industrial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	107	103
Commercial and industrial | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	461	582
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	328	110
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	36,496	25,695
ACL Allocation	3,180	186
Commercial real estate | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	36,494	24,277
Commercial real estate | Business Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	1,418
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 2	$ 0