SECURITIES AVAILABLE FOR SALE - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized Cost
Total debt securities	$ 401,869
Equity securities	50
Totals	401,919	$ 392,279
Gross Unrealized Gains
Totals	3,138	3,885
Gross Unrealized Losses
Totals	4,903	2,040
Fair Value
Total debt securities	400,063
Equity securities	91
Totals	400,154	394,124
Debt securities
Amortized Cost
Total debt securities	401,869	392,229
Gross Unrealized Gains
Total debt securities	3,097	3,862
Gross Unrealized Losses
Total debt securities	4,903	2,040
Fair Value
Total debt securities	400,063	394,051
Debt securities \| U.S. Government Agencies
Amortized Cost
Total debt securities	39,569	47,209
Gross Unrealized Gains
Total debt securities	147	200
Gross Unrealized Losses
Total debt securities	124	182
Fair Value
Total debt securities	39,592	47,227
Debt securities \| States and political subdivisions
Amortized Cost
Total debt securities	163,677	124,421
Gross Unrealized Gains
Total debt securities	1,782	2,483
Gross Unrealized Losses
Total debt securities	1,177	943
Fair Value
Total debt securities	164,282	125,961
Debt securities \| U.S. Government Sponsored Enterprises (GSE) residential mortgage-backed securities
Amortized Cost
Total debt securities	116,022	132,389
Gross Unrealized Gains
Total debt securities	928	229
Gross Unrealized Losses
Total debt securities	6	269
Fair Value
Total debt securities	116,944	132,349
Debt securities \| GSE residential collateralized mortgage obligations (CMOs)
Amortized Cost
Total debt securities	72,411	15,668
Gross Unrealized Gains
Total debt securities	240	215
Gross Unrealized Losses
Total debt securities	3,268	40
Fair Value
Total debt securities	69,383	15,843
Debt securities \| GSE commercial CMOs
Amortized Cost
Total debt securities	5,148	63,598
Gross Unrealized Gains
Total debt securities	0	735
Gross Unrealized Losses
Total debt securities	292	563
Fair Value
Total debt securities	4,856	63,770
Debt securities \| Private label CMOs
Amortized Cost
Total debt securities	5,042	8,944
Gross Unrealized Gains
Total debt securities	0	0
Gross Unrealized Losses
Total debt securities	36	43
Fair Value
Total debt securities	5,006	8,901
Equity securities
Amortized Cost
Equity securities	50	50
Gross Unrealized Gains
Equity securities	41	23
Gross Unrealized Losses
Equity securities	0	0
Fair Value
Equity securities	$ 91	$ 73

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

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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