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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
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment $ 50,181 $ 52,019
Collectively evaluated for impairment 6,979,486 6,952,289
Total gross loans 7,029,667 7,004,308
Mortgage Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 28,578 29,551
Collectively evaluated for impairment 4,810,985 4,827,558
Total gross loans 4,839,563 4,857,109
Commercial Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 19,393 20,255
Collectively evaluated for impairment 1,689,449 1,610,189
Total gross loans 1,708,842 1,630,444
Consumer Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Individually evaluated for impairment 2,210 2,213
Collectively evaluated for impairment 479,052 514,542
Total gross loans $ 481,262 $ 516,755