ACL for Loans - Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 41,135 $ 52,736
Total Recorded Investment in Collateral Dependent Loans 34,640 48,318
Recorded Investment without a Specific Reserve 18,406 23,400
Recorded Investment with a Specific Reserve 16,234 24,918
Related Specific Reserve 1,024 6,185
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 29,562 37,184
Total Recorded Investment in Collateral Dependent Loans 27,617 35,915
Recorded Investment without a Specific Reserve 11,891 14,728
Recorded Investment with a Specific Reserve 15,726 21,187
Related Specific Reserve 896 3,454
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 8,880 10,628
Total Recorded Investment in Collateral Dependent Loans 4,699 8,409
Recorded Investment without a Specific Reserve 4,191 4,696
Recorded Investment with a Specific Reserve 508 3,713
Related Specific Reserve 128 2,713
Commercial construction    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,181 3,668
Total Recorded Investment in Collateral Dependent Loans 1,045 2,999
Recorded Investment without a Specific Reserve 1,045 2,999
Recorded Investment with a Specific Reserve 0 0
Related Specific Reserve 0 0
SBA Paycheck Protection Program ("PPP")    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 0 0
Total Recorded Investment in Collateral Dependent Loans 0 0
Recorded Investment without a Specific Reserve 0 0
Recorded Investment with a Specific Reserve 0 0
Related Specific Reserve 0 0
Residential mortgages    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,165 699
Total Recorded Investment in Collateral Dependent Loans 1,033 596
Recorded Investment without a Specific Reserve 1,033 596
Recorded Investment with a Specific Reserve 0 0
Related Specific Reserve 0 0
Home equity loans and lines    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 347 539
Total Recorded Investment in Collateral Dependent Loans 246 381
Recorded Investment without a Specific Reserve 246 381
Recorded Investment with a Specific Reserve 0 0
Related Specific Reserve 0 0
Consumer    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 0 18
Total Recorded Investment in Collateral Dependent Loans 0 18
Recorded Investment without a Specific Reserve 0 0
Recorded Investment with a Specific Reserve 0 18
Related Specific Reserve $ 0 $ 18