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Loans Receivable and Allowance for Loan Losses - Summary of Loans Receivable by Portfolio Segment and Impairment Method (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 86,046 $ 70,641
Collectively evaluated for impairment 9,753,812 7,266,923
Total gross loans 9,839,858 7,337,564
Mortgage loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 48,783 39,910
Collectively evaluated for impairment 6,731,039 5,271,535
Total gross loans 6,779,822 5,311,445
Commercial loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 35,832 28,357
Collectively evaluated for impairment 2,531,638 1,606,402
Total gross loans 2,567,470 1,634,759
Consumer loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,431 2,374
Collectively evaluated for impairment 491,135 388,986
Total gross loans $ 492,566 $ 391,360