INVESTMENTS (Amortized Cost and Estimated Fair Values of investment securities Available-For-Sale by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 3,179	$ 301
Due after one year through five years	152,318	157,710
Due after five years through ten years	247,172	168,136
Due after ten years	274,372	253,792
Total debt securities available for sale	677,041	579,939
Estimated Fair Value
Due in one year or less	3,234	306
Due after one year through five years	159,496	160,257
Due after five years through ten years	256,946	174,677
Due after ten years	279,587	255,586
Estimated Fair Value	$ 699,263	$ 590,826