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Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Portfolio Segment and Impairment Method) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 65,809 $ 70,641
Collectively evaluated for impairment 9,708,784 7,266,923
Total gross loans 9,774,593 7,337,564
Mortgage Portfolio Segment    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 43,397 39,910
Collectively evaluated for impairment 7,034,549 5,271,535
Total gross loans 7,077,946 5,311,445
Commercial Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 20,963 28,357
Collectively evaluated for impairment 2,269,233 1,606,402
Total gross loans 2,290,196 1,634,759
Consumer Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 1,449 2,374
Collectively evaluated for impairment 405,002 388,986
Total gross loans $ 406,451 $ 391,360