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Deposits - Time Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Time Deposits [Abstract]    
Time deposits under $100,000 $ 113,903us-gaap_TimeDepositsLessThan100000 $ 135,998us-gaap_TimeDepositsLessThan100000
Time deposits of $100,000 or more 81,597us-gaap_TimeDeposits100000OrMore 100,362us-gaap_TimeDeposits100000OrMore
Total $ 195,500us-gaap_TimeDeposits $ 236,360us-gaap_TimeDeposits