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Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans Receivable by Class (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance $ 48,672 $ 19,491  
Loans with no related allowance, Recorded Investment 43,683 15,952  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 40,411 16,416  
Loans with no related allowance, Interest Income Recognized 667 636  
Loans with an allowance recorded, Unpaid Principal Balance 48,455 58,335  
Loans with an allowance recorded, Recorded Investment 42,363 54,689  
Loans with an allowance recorded, Related Allowance 8,974 5,067  
Loans with an allowance recorded, Average Recorded Investment 26,352 57,721  
Loans with an allowance recorded, Interest Income Recognized 1,208 1,487  
Total, Unpaid Principal Balance 97,127 77,826  
Total, Recorded Investment 86,046 70,641  
Total, Related Allowance 8,974 5,067  
Total, Average Recorded Investment 66,763 74,137  
Total, Interest Income Recognized 1,875 2,123 $ 2,000
Mortgage loans      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 31,395 13,478  
Loans with no related allowance, Recorded Investment 28,794 10,739  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 27,613 10,910  
Loans with no related allowance, Interest Income Recognized 571 533  
Loans with an allowance recorded, Unpaid Principal Balance 22,943 29,705  
Loans with an allowance recorded, Recorded Investment 19,989 29,171  
Loans with an allowance recorded, Related Allowance 4,220 1,580  
Loans with an allowance recorded, Average Recorded Investment 7,727 29,316  
Loans with an allowance recorded, Interest Income Recognized 877 997  
Total, Unpaid Principal Balance 54,338 43,183  
Total, Recorded Investment 48,783 39,910  
Total, Related Allowance 4,220 1,580  
Total, Average Recorded Investment 35,340 40,226  
Total, Interest Income Recognized 1,448 1,530  
Mortgage loans | Residential Real Estate      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 13,981 13,478  
Loans with no related allowance, Recorded Investment 11,380 10,739  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 11,587 10,910  
Loans with no related allowance, Interest Income Recognized 511 533  
Loans with an allowance recorded, Unpaid Principal Balance 7,950 10,860  
Loans with an allowance recorded, Recorded Investment 7,506 10,326  
Loans with an allowance recorded, Related Allowance 806 829  
Loans with an allowance recorded, Average Recorded Investment 7,604 10,454  
Loans with an allowance recorded, Interest Income Recognized 307 428  
Total, Unpaid Principal Balance 21,931 24,338  
Total, Recorded Investment 18,886 21,065  
Total, Related Allowance 806 829  
Total, Average Recorded Investment 19,191 21,364  
Total, Interest Income Recognized 818 961  
Mortgage loans | Commercial Real Estate      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 17,414 0  
Loans with no related allowance, Recorded Investment 17,414 0  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 16,026 0  
Loans with no related allowance, Interest Income Recognized 60 0  
Loans with an allowance recorded, Unpaid Principal Balance 14,993 18,845  
Loans with an allowance recorded, Recorded Investment 12,483 18,845  
Loans with an allowance recorded, Related Allowance 3,414 751  
Loans with an allowance recorded, Average Recorded Investment 123 18,862  
Loans with an allowance recorded, Interest Income Recognized 570 569  
Total, Unpaid Principal Balance 32,407 18,845  
Total, Recorded Investment 29,897 18,845  
Total, Related Allowance 3,414 751  
Total, Average Recorded Investment 16,149 18,862  
Total, Interest Income Recognized 630 569  
Mortgage loans | Multifamily      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 0 0  
Loans with no related allowance, Recorded Investment 0 0  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 0 0  
Loans with no related allowance, Interest Income Recognized 0 0  
Loans with an allowance recorded, Unpaid Principal Balance 0 0  
Loans with an allowance recorded, Recorded Investment 0 0  
Loans with an allowance recorded, Related Allowance 0 0  
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Unpaid Principal Balance 0 0  
Total, Recorded Investment 0 0  
Total, Related Allowance 0 0  
Total, Average Recorded Investment 0 0  
Total, Interest Income Recognized 0 0  
Mortgage loans | Construction      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 0 0  
Loans with no related allowance, Recorded Investment 0 0  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 0 0  
Loans with no related allowance, Interest Income Recognized 0 0  
Loans with an allowance recorded, Unpaid Principal Balance 0 0  
Loans with an allowance recorded, Recorded Investment 0 0  
Loans with an allowance recorded, Related Allowance 0 0  
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Unpaid Principal Balance 0 0  
Total, Recorded Investment 0 0  
Total, Related Allowance 0 0  
Total, Average Recorded Investment 0 0  
Total, Interest Income Recognized 0 0  
Commercial loans      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 15,895 3,927  
Loans with no related allowance, Recorded Investment 14,009 3,696  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 12,791 4,015  
Loans with no related allowance, Interest Income Recognized 46 17  
Loans with an allowance recorded, Unpaid Principal Balance 24,947 27,762  
Loans with an allowance recorded, Recorded Investment 21,823 24,661  
Loans with an allowance recorded, Related Allowance 4,715 3,462  
Loans with an allowance recorded, Average Recorded Investment 18,620 27,527  
Loans with an allowance recorded, Interest Income Recognized 311 444  
Total, Unpaid Principal Balance 40,842 31,689  
Total, Recorded Investment 35,832 28,357  
Total, Related Allowance 4,715 3,462  
Total, Average Recorded Investment 31,411 31,542  
Total, Interest Income Recognized 357 461  
Consumer loans      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance, Unpaid Principal Balance 1,382 2,086  
Loans with no related allowance, Recorded Investment 880 1,517  
Loans with no related allowance, Related Allowance 0 0  
Loans with no related allowance, Average Recorded Investment 7 1,491  
Loans with no related allowance, Interest Income Recognized 50 86  
Loans with an allowance recorded, Unpaid Principal Balance 565 868  
Loans with an allowance recorded, Recorded Investment 551 857  
Loans with an allowance recorded, Related Allowance 39 25  
Loans with an allowance recorded, Average Recorded Investment 5 878  
Loans with an allowance recorded, Interest Income Recognized 20 46  
Total, Unpaid Principal Balance 1,947 2,954  
Total, Recorded Investment 1,431 2,374  
Total, Related Allowance 39 25  
Total, Average Recorded Investment 12 2,369  
Total, Interest Income Recognized $ 70 $ 132