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Loans Receivable and Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period $ 55,525 $ 55,562 $ 60,195
Provision charged to operations 29,712 13,100 23,700
Increase due to the initial adoption of CECL 7,920 0 0
Initial allowance related to PCD loans 13,586 0 0
Recoveries of loans previously charged off 2,636 1,895 1,685
Loans charged off (7,913) (15,032) (30,018)
Balance at end of period 101,466 55,525 55,562
Mortgage loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 25,511 27,678  
Provision charged to operations 18,945 (2,323)  
Increase due to the initial adoption of CECL 14,188    
Initial allowance related to PCD loans 11,984    
Recoveries of loans previously charged off 396 422  
Loans charged off (2,717) (266)  
Balance at end of period 68,307 25,511 27,678
Commercial loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 28,263 25,693  
Provision charged to operations 10,199 15,928  
Increase due to the initial adoption of CECL (9,974)    
Initial allowance related to PCD loans 1,582    
Recoveries of loans previously charged off 1,776 665  
Loans charged off (4,762) (14,023)  
Balance at end of period 27,084 28,263 25,693
Consumer loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 1,751 2,191  
Provision charged to operations 568 (505)  
Increase due to the initial adoption of CECL 3,706    
Initial allowance related to PCD loans 20    
Recoveries of loans previously charged off 464 808  
Loans charged off (434) (743)  
Balance at end of period $ 6,075 $ 1,751 $ 2,191