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Deposits - Summary of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Noninterest-bearing:    
Noninterest-bearing demand $ 2,189,573 $ 1,626,252
Total noninterest-bearing 2,189,573 1,626,252
Interest-bearing:    
Interest-bearing demand 2,129,725 1,062,228
Savings 1,563,000 538,213
Money market 2,100,188 1,542,962
Customer time deposits 1,356,610 672,942
Brokered deposits 247,761 197,834
Total interest-bearing 7,397,284 4,014,179
Total deposits $ 9,586,857 $ 5,640,431