CREDIT QUALITY ASSESSMENT (Recorded Investment with Respect to Impaired loans, Associated Allowance by Applicable Portfolio Segment and Principal Balance of Impaired Loans prior to Amounts Charged-off) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	$ 13,563	$ 14,208	$ 11,411
Impaired loans without a specific allowance	10,529	14,719	18,008
Impaired loans	24,092	28,927	$ 29,419
Impaired Financing Receivable, Related Allowance	4,825	3,375
Unpaid principal balance in total impaired loans	39,016	42,461
Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	11,720	12,536
Impaired loans without a specific allowance	3,207	5,035
Impaired loans	14,927	17,571
Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,140	876
Impaired loans without a specific allowance	1,349	3,591
Impaired loans	2,489	4,467
Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	703	796
Impaired loans without a specific allowance	5,973	6,093
Impaired loans	6,676	6,889
Commercial
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	4,011	2,200
Impaired loans without a specific allowance	3,007	3,073
Impaired loans	7,018	5,273
Impaired Financing Receivable, Related Allowance	2,604	1,318
Unpaid principal balance in total impaired loans	10,082	7,158
Commercial | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,807	1,168
Impaired loans without a specific allowance	1,562	974
Impaired loans	4,369	2,142
Commercial | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,140	876
Impaired loans without a specific allowance	45	701
Impaired loans	1,185	1,577
Commercial | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	64	156
Impaired loans without a specific allowance	1,400	1,398
Impaired loans	1,464	1,554
All Other
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	3,263	6,439
Impaired loans	3,263	6,439
Impaired Financing Receivable, Related Allowance	0	0
Unpaid principal balance in total impaired loans	3,971	7,154
All Other | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	2,750
Impaired loans	0	2,750
All Other | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	560	577
Impaired loans	560	577
All Other | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	2,703	3,112
Impaired loans	2,703	3,112
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	58
Impaired loans without a specific allowance	137	136
Impaired loans	137	194
Impaired Financing Receivable, Related Allowance	0	58
Unpaid principal balance in total impaired loans	4,398	4,456
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	58
Impaired loans without a specific allowance	0	0
Impaired loans	0	58
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	0
Impaired loans	0	0
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	137	136
Impaired loans	137	136
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	7,029	7,791
Impaired loans without a specific allowance	1,078	2,650
Impaired loans	8,107	10,441
Impaired Financing Receivable, Related Allowance	1,736	1,489
Unpaid principal balance in total impaired loans	12,805	15,138
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	7,029	7,791
Impaired loans without a specific allowance	562	518
Impaired loans	7,591	8,309
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	2,073
Impaired loans	0	2,073
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	516	59
Impaired loans	516	59
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,523	4,159
Impaired loans without a specific allowance	3,044	2,421
Impaired loans	5,567	6,580
Impaired Financing Receivable, Related Allowance	485	510
Unpaid principal balance in total impaired loans	7,760	8,555
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,884	3,519
Impaired loans without a specific allowance	1,083	793
Impaired loans	2,967	4,312
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	744	240
Impaired loans	744	240
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	639	640
Impaired loans without a specific allowance	1,217	1,388
Impaired loans	$ 1,856	$ 2,028