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Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Banking and Thrift, Other Disclosures [Abstract]    
Savings $ 1,310,231 $ 983,714
Money market 2,124,907 1,738,202
NOW 2,603,551 2,092,413
Non-interest bearing 2,375,864 1,554,253
Certificates of deposit 1,144,688 734,027
Total deposits $ 9,559,241 $ 7,102,609