CREDIT QUALITY ASSESSMENT (Summary of Impaired Loans) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Credit Quality Assessment [Abstract]
Impaired loans with a specific allowance	$ 13,563	$ 14,208	$ 11,411
Impaired loans without a specific allowance	10,529	14,719	18,008
Total impaired loans	24,092	28,927	29,419
Allowance for loan and lease losses related to impaired loans	4,825	3,375	2,894
Allowance for loan and lease losses related to loans collectively evaluated	39,242	37,520	34,908
Total allowance for loan and lease losses	44,067	40,895	37,802
Average impaired loans for the period	26,382	29,828	34,331
Contractual interest income due on impaired loans during the period	2,082	2,527	2,339
Interest income on impaired loans recognized on a cash basis	511	961	773
Interest income on impaired loans recognized on an accrual basis	$ 186	$ 274	$ 280