Portfolio Loans Receivable - Outstanding Loan Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 1,616,423	$ 1,531,202
Residential | Real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	430,244	401,607
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	193,262	175,956
Commercial and Industrial | Real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	608,646	556,339
Construction | Real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	241,249	255,147
Construction | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	100,974	118,518
Consumer | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	142,166	141,120
Consumer | Credit card | Savings Deposits
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	121,300	121,700
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	2,295	2,247
Loans receivable, gross	856	1,033
Commitments to Extend Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	364,791	360,386
Letters of credit	5,085	5,105
Commitments to Extend Credit | Residential | Real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	18,255	15,747
Commitments to Extend Credit | Residential | Residential - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	37,390	37,640
Commitments to Extend Credit | Residential | Commitments to originate residential loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	183	1,385
Commitments to Extend Credit | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	48,919	45,135
Commitments to Extend Credit | Commercial and Industrial | Real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	30,879	17,225
Commitments to Extend Credit | Consumer | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit	$ 126,079	$ 123,874