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OFF-BALANCE SHEET COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Commitments to extend credit    
Other Commitments [Line Items]    
Fixed Rate $ 69,279 $ 87,517
Variable Rate 66,222 82,818
Unused lines of credit    
Other Commitments [Line Items]    
Fixed Rate 17,929 20,631
Variable Rate 405,106 295,626
Letters of credit    
Other Commitments [Line Items]    
Fixed Rate 760 825
Variable Rate $ 9,862 $ 10,411