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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Non-interest-bearing $ 351,743 $ 337,143
Interest-bearing checking 860,468 859,927
Money market deposit 163,885 153,196
Savings 327,845 310,989
Time deposits 267,420 255,423
Total deposits $ 1,971,360 $ 1,916,678