LOANS AND LEASES - Restructured Loans (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) loans d	Mar. 31, 2018 USD ($) loans	Dec. 31, 2018 USD ($) loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extended Maturities	$ 2,877,000	$ 888,000
Adjusted Interest Rates	5,284,000	52,000
Combined Rate And Maturity	508,000	0
Forebearance Agreements	557,000	0
Other	142,000	138,000
Total	$ 9,368,000	$ 1,078,000
Restructured loans, Number of Loans | loans	17	8
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 9,435,000	$ 1,093,000
Restructured loans, Period End Balance	9,368,000	1,078,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 6,900,000	0
Number of Restructured Loans | loans	201		196
Total restructured loans	$ 35,900,000		$ 38,500,000
Restructured loans on accrual status	22,817,000		16,109,000
Restructured Loans, Nonaccrual Status	13,100,000		22,400,000
Loans and Leases Receivable, Impaired, Commitment to Lend	0		0
Allowance for loan and lease losses lncluded in reserves for restructured loans	1,400,000		1,500,000
Restructured Loans, Portion Determined to be Uncollectible	0	$ 0
Accruing TDRs performing in accordance with restructured terms for more than one year	$ 7,500,000		$ 7,900,000
Restructured loans performance threshold (days) | d	90
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	2	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	5	4
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 7,637,000	$ 928,000
Restructured loans, Period End Balance	$ 7,661,000	$ 913,000
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	6	2
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 1,323,000	$ 72,000
Restructured loans, Period End Balance	$ 1,232,000	$ 72,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	5	2
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 458,000	$ 93,000
Restructured loans, Period End Balance	458,000	$ 93,000
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	$ 250,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	1	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 17,000	$ 0
Restructured loans, Period End Balance	$ 17,000	$ 0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0