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Loans Receivable and Allowance for Loan Losses - Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 8,974 $ 5,067
Collectively evaluated for impairment 92,492 50,458
Total 101,466 55,525
Mortgage loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 4,220 1,580
Collectively evaluated for impairment 64,087 23,931
Total 68,307 25,511
Commercial loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 4,715 3,462
Collectively evaluated for impairment 22,369 24,801
Total 27,084 28,263
Consumer loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 39 25
Collectively evaluated for impairment 6,036 1,726
Total $ 6,075 $ 1,751