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Deposits - Composition of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Noninterest-bearing Deposit Liabilities [Abstract]    
Noninterest-bearing deposits $ 3,673,541 $ 3,250,174
Interest-bearing deposits    
Investment checking 407,058 367,253
Money market 1,504,021 1,293,210
Savings 342,236 296,135
Time deposits 382,824 710,488
Total deposits $ 6,309,680 $ 5,917,260
Noninterest-bearing deposits,percentage of total deposits 58.20% 54.90%
Investment checking, percentage of total deposits 6.50% 6.20%
Money market,percentage of total deposits 23.80% 21.90%
Savings,percentage of total deposits 5.40% 5.00%
Time deposits, percentage of total deposits 6.10% 12.00%
Percentage of deposit, total 100.00% 100.00%