SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	$ 313,073
Equity securities, amortized cost	50
Totals, amortized cost	313,123	$ 392,279
Totals, gross unrealized gains	11,747	3,885
Totals, gross unrealized losses	330	2,040
Total debt securities, fair value	324,465
Equity securities, fair value	75
Totals, fair value	324,540	394,124
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	313,073	392,229
Total debt securities, gross unrealized gains	11,722	3,862
Total debt securities, gross unrealized losses	330	2,040
Total debt securities, fair value	324,465	394,051
Debt Securities \| U.S. Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	43,330	47,209
Total debt securities, gross unrealized gains	199	200
Total debt securities, gross unrealized losses	135	182
Total debt securities, fair value	43,394	47,227
Debt Securities \| States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	123,818	124,421
Total debt securities, gross unrealized gains	8,478	2,483
Total debt securities, gross unrealized losses	113	943
Total debt securities, fair value	132,183	125,961
Debt Securities \| U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	126,213	132,389
Total debt securities, gross unrealized gains	2,662	229
Total debt securities, gross unrealized losses	0	269
Total debt securities, fair value	128,875	132,349
Debt Securities \| GSE residential collateralized mortgage obligations (CMOs)
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	12,363	15,668
Total debt securities, gross unrealized gains	383	215
Total debt securities, gross unrealized losses	9	40
Total debt securities, fair value	12,737	15,843
Debt Securities \| GSE commercial CMOs
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost		63,598
Total debt securities, gross unrealized gains		735
Total debt securities, gross unrealized losses		563
Total debt securities, fair value		63,770
Debt Securities \| Private label CMOs
Schedule of Available-for-sale Securities [Line Items]
Total debt securities, amortized cost	7,349	8,944
Total debt securities, gross unrealized gains	0	0
Total debt securities, gross unrealized losses	73	43
Total debt securities, fair value	7,276	8,901
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Equity securities, amortized cost	50	50
Equity securities, gross unrealized gains	25	23
Equity securities, gross unrealized losses	0	0
Equity securities, fair value	$ 75	$ 73

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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