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CREDIT QUALITY ASSESSMENT (Summary of Impaired Loans) (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Credit Quality Assessment [Abstract]    
Impaired loans with a specific allowance $ 13,436 $ 13,563
Impaired loans without a specific allowance 9,077 10,529
Total impaired loans 22,513 24,092
Allowance for loan and lease losses related to impaired loans 4,770 4,825
Allowance for loan and lease losses related to loans collectively evaluated 40,154 39,242
Total allowance for loan and lease losses 44,924 44,067
Average impaired loans for the period 23,772 26,382
Contractual interest income due on impaired loans during the period 1,813 2,082
Interest income on impaired loans recognized on a cash basis 462 511
Interest income on impaired loans recognized on an accrual basis $ 215 $ 186