Loans Receivable and Allowance for Credit Losses - Payment Status Recorded Investment (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	$ 122,678,000
Commitment to lend	5,800,000	$ 16,200,000
Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	113,850,000
30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	1,931,000
90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	6,897,000
Commercial lending
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	111,616,000
Commercial lending | Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	105,184,000
Commercial lending | 30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial lending | 90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	6,432,000
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	64,913,000
Commercial lending | Commercial and industrial (“C&I”) | Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	58,481,000
Commercial lending | Commercial and industrial (“C&I”) | 30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial lending | Commercial and industrial (“C&I”) | 90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	6,432,000
Commercial lending | CRE
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	46,703,000
Commercial lending | CRE | Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	46,703,000
Commercial lending | CRE | 30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial lending | CRE | 90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Consumer lending
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	11,062,000
Consumer lending | Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	8,666,000
Consumer lending | 30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	1,931,000
Consumer lending | 90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	465,000
Consumer lending | Real estate loan | Single-family residential
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	9,085,000
Consumer lending | Real estate loan | Current Accruing Loans | Single-family residential
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	7,430,000
Consumer lending | Real estate loan | 30 - 89 Days Past Due | Single-family residential
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	1,190,000
Consumer lending | Real estate loan | 90+ Days Past Due | Single-family residential
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	465,000
Consumer lending | HELOCs
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	1,977,000
Consumer lending | HELOCs | Current Accruing Loans
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	1,236,000
Consumer lending | HELOCs | 30 - 89 Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	741,000
Consumer lending | HELOCs | 90+ Days Past Due
Financing Receivable Allowance for Credit Losses
Financing receivable, modified, accumulated	$ 0