LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commitments to extend credit
Other Commitments [Line Items]
Fixed Rate	$ 88,774	$ 40,312
Variable Rate	180,288	99,026
Unused lines of credit
Other Commitments [Line Items]
Fixed Rate	15,305	6,044
Variable Rate	785,898	508,295
Letters of credit
Other Commitments [Line Items]
Fixed Rate	1,411	2,611
Variable Rate	$ 10,469	$ 11,278