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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to extend credit    
Other Commitments [Line Items]    
Fixed Rate $ 10,697 $ 40,312
Variable Rate 219,865 99,026
Unused lines of credit    
Other Commitments [Line Items]    
Fixed Rate 12,354 6,044
Variable Rate 698,215 508,295
Letters of credit    
Other Commitments [Line Items]    
Fixed Rate 1,377 2,611
Variable Rate $ 13,790 $ 11,278