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Loans - Narrative, Collateral-Dependent Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]    
Collateral-dependent impaired loans $ 7,000 $ 7,400
Real estate loans: | Commercial mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Collateral-dependent impaired loans 4,700  
Real estate loans: | Multifamily    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Collateral-dependent impaired loans 1,900  
Real estate loans: | One-to-four family residential mortgage    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Collateral-dependent impaired loans $ 309