INVESTMENT SECURITIES - Schedule of Unrealized Losses and Fair Value by Investment Category for Securities Available for Sale (Detail) $ in Thousands	Mar. 31, 2017 USD ($) Security	Dec. 31, 2016 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Count | Security	205	222
Less than 12 months fair value	$ 110,017	$ 115,234
Less than 12 Months unrealized losses	(2,277)	(3,268)
12 months or more fair value	10,094	9,647
12 months or more unrealized losses	(314)	(315)
Total fair value	120,111	124,881
Unrealized losses	$ (2,591)	$ (3,583)
Obligations of other U.S. government agencies and corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	47	45
Less than 12 months fair value	$ 25,563	$ 22,819
Less than 12 Months unrealized losses	(316)	(382)
12 months or more fair value	440	448
12 months or more unrealized losses	(4)	(5)
Total fair value	26,003	23,267
Unrealized losses	$ (320)	$ (387)
Obligations of state and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	22	33
Less than 12 months fair value	$ 23,027	$ 25,764
Less than 12 Months unrealized losses	(1,063)	(1,791)
12 months or more fair value	0	0
12 months or more unrealized losses	0	0
Total fair value	23,027	25,764
Unrealized losses	$ (1,063)	$ (1,791)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	25	27
Less than 12 months fair value	$ 2,745	$ 3,724
Less than 12 Months unrealized losses	(103)	(132)
12 months or more fair value	7,180	6,929
12 months or more unrealized losses	(245)	(246)
Total fair value	9,925	10,653
Unrealized losses	$ (348)	$ (378)
Residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	104	110
Less than 12 months fair value	$ 56,232	$ 60,433
Less than 12 Months unrealized losses	(732)	(883)
12 months or more fair value	1,988	1,778
12 months or more unrealized losses	(12)	(17)
Total fair value	58,220	62,211
Unrealized losses	$ (744)	$ (900)
Commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	4	4
Less than 12 months fair value	$ 2,445	$ 2,444
Less than 12 Months unrealized losses	(62)	(76)
12 months or more fair value	0	0
12 months or more unrealized losses	0	0
Total fair value	2,445	2,444
Unrealized losses	$ (62)	$ (76)
Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Count | Security	3	3
Less than 12 months fair value	$ 5	$ 50
Less than 12 Months unrealized losses	(1)	(4)
12 months or more fair value	486	492
12 months or more unrealized losses	(53)	(47)
Total fair value	491	542
Unrealized losses	$ (54)	$ (51)