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Loans Receivable and Allowance for Loan Losses - Summary of nonaccrual loans by portfolio segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due    
Total nonaccrual loans $ 31,366 $ 33,416
Residential Real Estate    
Financing Receivable, Recorded Investment, Past Due    
Total nonaccrual loans 1,289 1,492
Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due    
Total nonaccrual loans 19,277 21,093
Commercial business    
Financing Receivable, Recorded Investment, Past Due    
Total nonaccrual loans 1,803 1,834
Construction    
Financing Receivable, Recorded Investment, Past Due    
Total nonaccrual loans $ 8,997 $ 8,997