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Deposits - Summary of Balances of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Deposits [Abstract]    
Noninterest-bearing demand $ 1,221,503 $ 1,155,695
Interest-bearing demand 910,638 853,961
Savings 1,366,892 1,281,540
Time certificates, $250,000 and over 76,047 75,897
Other time certificates 260,932 264,173
Total deposits $ 3,836,012 $ 3,631,266