LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Activity in allowance for loan losses
Balance, beginning of year	$ 13,568	$ 14,747	$ 20,965
Provision for loan losses	250	(603)	(3,900)
Charge-offs	(1,722)	(1,502)	(3,741)
Recoveries	679	926	1,423
Balance, end of year	12,775	13,568	14,747
Commercial
Activity in allowance for loan losses
Balance, beginning of year	9,803	11,148	14,993
Provision for loan losses	(38)	(1,336)	(2,197)
Charge-offs	(951)	(848)	(2,977)
Recoveries	424	839	1,329
Balance, end of year	9,238	9,803	11,148
Commercial \| Commercial Real Estate
Activity in allowance for loan losses
Balance, beginning of year	7,883	9,462	13,215
Provision for loan losses	107	(1,020)	(1,674)
Charge-offs	(872)	(711)	(2,637)
Recoveries	412	152	558
Balance, end of year	7,530	7,883	9,462
Commercial \| Acquisition and Development
Activity in allowance for loan losses
Balance, beginning of year	850	697	670
Provision for loan losses	(270)	(440)	92
Charge-offs	0	(22)	(70)
Recoveries	0	615	5
Balance, end of year	580	850	697
Commercial \| Commercial and Industrial
Activity in allowance for loan losses
Balance, beginning of year	1,012	806	864
Provision for loan losses	129	249	(554)
Charge-offs	(79)	(115)	(270)
Recoveries	12	72	766
Balance, end of year	1,074	1,012	806
Commercial \| Municipal
Activity in allowance for loan losses
Balance, beginning of year	58	183	244
Provision for loan losses	(4)	(125)	(61)
Charge-offs	0	0	0
Recoveries	0	0	0
Balance, end of year	54	58	183
Consumer
Activity in allowance for loan losses
Balance, beginning of year	2,991	2,381	3,904
Provision for loan losses	648	1,177	(853)
Charge-offs	(771)	(654)	(764)
Recoveries	255	87	94
Balance, end of year	3,123	2,991	2,381
Consumer \| Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of year	2,870	2,262	3,780
Provision for loan losses	532	1,122	(960)
Charge-offs	(577)	(592)	(587)
Recoveries	154	78	29
Balance, end of year	2,979	2,870	2,262
Consumer \| Installment and Other
Activity in allowance for loan losses
Balance, beginning of year	121	119	124
Provision for loan losses	116	55	107
Charge-offs	(194)	(62)	(177)
Recoveries	101	9	65
Balance, end of year	144	121	119
Unallocated
Activity in allowance for loan losses
Balance, beginning of year	774	1,218	2,068
Provision for loan losses	(360)	(444)	(850)
Charge-offs	0	0	0
Recoveries	0	0	0
Balance, end of year	$ 414	$ 774	$ 1,218

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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