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Deposits - Principal Maturities of Certificate of Deposit and Individual Retirement Accounts (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Banking and Thrift [Abstract]  
2016 $ 232,189
2017 132,540
2018 93,092
2019 35,463
2020 21,305
Thereafter 508
Time Deposits, Total $ 515,097