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Deposits - Summary of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deposits [Abstract]    
Non-interest-bearing demand $ 3,059,949 $ 2,647,623
Interest-bearing demand 5,311,589 4,547,628
Savings 1,786,459 1,575,922
Certificates and other time deposits 2,465,466 2,611,035
Total Deposits $ 12,623,463 $ 11,382,208