Loans Receivable, Including Loans Held For Sale - Past Due Loans (Accruing and Nonaccruing) (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Receivable [Line Items]
Total Loans	$ 1,151,445,000	$ 982,008,000
Recorded Investment In Accruing Loans 90+ Days Past Due	15,790,000	15,940,000
Nonaccrual Loans That Are Current	788,000	788,000
Current
Receivable [Line Items]
Total Loans	1,119,215,000	948,798,000
30-89 Days Past Due
Receivable [Line Items]
Total Loans	16,440,000	17,270,000
90+ Days Past Due
Receivable [Line Items]
Total Loans	15,790,000	15,940,000
Total Past Due
Receivable [Line Items]
Total Loans	32,230,000	33,210,000
Commercial real estate loans
Receivable [Line Items]
Total Loans	1,270,000	987,000
Recorded Investment In Accruing Loans 90+ Days Past Due	0	0
Nonaccrual Loans That Are Current	0	0
Commercial real estate loans | Current
Receivable [Line Items]
Total Loans	1,270,000	987,000
Commercial real estate loans | 30-89 Days Past Due
Receivable [Line Items]
Total Loans	0	0
Commercial real estate loans | 90+ Days Past Due
Receivable [Line Items]
Total Loans	0	0
Commercial real estate loans | Total Past Due
Receivable [Line Items]
Total Loans	0	0
Commercial and industrial
Receivable [Line Items]
Total Loans	1,020,600,000	857,817,000
Recorded Investment In Accruing Loans 90+ Days Past Due	10,620,000	11,260,000
Nonaccrual Loans That Are Current	788,000	788,000
Commercial and industrial | Current
Receivable [Line Items]
Total Loans	997,380,000	832,757,000
Commercial and industrial | 30-89 Days Past Due
Receivable [Line Items]
Total Loans	12,600,000	13,800,000
Commercial and industrial | 90+ Days Past Due
Receivable [Line Items]
Total Loans	10,620,000	11,260,000
Commercial and industrial | Total Past Due
Receivable [Line Items]
Total Loans	23,220,000	25,060,000
Consumer loans
Receivable [Line Items]
Total Loans	129,575,000	123,204,000
Recorded Investment In Accruing Loans 90+ Days Past Due	5,170,000	4,680,000
Nonaccrual Loans That Are Current	0	0
Consumer loans | Current
Receivable [Line Items]
Total Loans	120,565,000	115,054,000
Consumer loans | 30-89 Days Past Due
Receivable [Line Items]
Total Loans	3,840,000	3,470,000
Consumer loans | 90+ Days Past Due
Receivable [Line Items]
Total Loans	5,170,000	4,680,000
Consumer loans | Total Past Due
Receivable [Line Items]
Total Loans	$ 9,010,000	$ 8,150,000