LOANS AND LEASES - Restructured Loans (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) loans	Jun. 30, 2016 USD ($) loans	Jun. 30, 2017 USD ($) loans d	Jun. 30, 2016 USD ($) loans	Dec. 31, 2016 USD ($) loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extended Maturities	$ 2,587,000	$ 35,000	$ 3,261,000	$ 521,000
Adjusted Interest Rates	0	0	2,767,000	0
Combined Rate And Maturity	180,000	0	180,000	162,000
Forebearance Agreements	827,000	88,000	827,000	88,000
Other	38,000	954,000	38,000	2,837,000
Total	$ 3,632,000	$ 1,077,000	$ 7,073,000	$ 3,608,000
Restructured loans, Number of Loans | loans	10	12	12	29
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 3,683,000	$ 1,514,000	$ 7,185,000	$ 4,077,000
Restructured loans, Period End Balance	$ 3,632,000	$ 1,077,000	$ 7,073,000	$ 3,608,000
Restructured loans with payment default within 12 months of modification, Number of Loans | loans	0	0	0	4
Restructured loans with payment default within 12 months of modification, Period End Balance	$ 0	$ 0	$ 0	$ 300,000
Number of Restructured Loans | loans	229		229		247
Total restructured loans	$ 29,600,000		$ 29,600,000		$ 35,400,000
Restructured loans on accrual status	20,135,000		20,135,000		30,240,000
Restructured Loans, Nonaccrual Status	9,400,000		9,400,000		5,100,000
Loans and Leases Receivable, Impaired, Commitment to Lend	200,000		200,000		900,000
Allowance for loan and lease losses lncluded in reserves for restructured loans	1,100,000		1,100,000		1,900,000
Restructured loans uncollectible portion written off	100,000	$ 300,000	100,000	$ 500,000
Accruing TDRs performing in accordance with restructured terms for more than one year	$ 13,800,000		$ 13,800,000		$ 22,600,000
Restructured loans performance threshold (days) | d			90
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	4	2	6	10
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 2,177,000	$ 44,000	$ 5,679,000	$ 2,127,000
Restructured loans, Period End Balance	$ 2,183,000	$ 35,000	$ 5,624,000	$ 2,130,000
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0	$ 0	$ 0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	6	9	6	10
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 1,506,000	$ 1,468,000	$ 1,506,000	$ 1,510,000
Restructured loans, Period End Balance	$ 1,449,000	$ 1,040,000	$ 1,449,000	$ 1,082,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0	0	2
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0	$ 0	$ 282,000
Restructured loans, Period End Balance	$ 0	$ 0	0	$ 247,000
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			$ 100,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0	0	4
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0	$ 0	$ 149,000
Restructured loans, Period End Balance	$ 0	$ 0	$ 0	$ 140,000
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	1	0	3
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 2,000	$ 0	$ 9,000
Restructured loans, Period End Balance	$ 0	$ 2,000	$ 0	$ 9,000