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Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]    
Savings $ 1,428,630 $ 1,348,147
Money market 2,461,688 2,245,412
NOW 3,558,816 2,808,637
Non-interest bearing 2,606,983 2,341,459
Certificates of deposit 780,504 1,094,174
Total deposits $ 10,836,621 $ 9,837,829