LOANS AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	May 19, 2017 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases receivable, related parties, period increase (decrease)	$ (10,800)
Financing receivable, modifications, post-modification recorded investment	$ 1,100	$ 1,260
Financing receivable, modifications, number of contracts \| contract	2	5
Financing receivable, recorded investment, nonaccrual status	$ 4,971	$ 8,972
Mortgage loans in process of foreclosure, amount	530	687
Loans and leases receivable, net amount, total	1,083,733	862,799
Financing receivable origination fee, net	609	509
Other real estate owned, net	$ 1,794	$ 2,477
Allowance from loan losses, as a percentage of total loans	0.89%	1.00%
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 0	$ 0
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, recorded investment, nonaccrual status	0	0
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, recorded investment, nonaccrual status	5,000	9,000
Directors, Associates and Policy Making Officers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases receivable, related parties	13,800	13,300
Loans and leases receivable, related parties, additions	2,300	3,300
Loans and leases receivable, related parties, proceeds	1,800	1,100
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, post-modification recorded investment		$ 688
Financing receivable, modifications, number of contracts \| contract		3
Financing receivable, recorded investment, nonaccrual status	1,482	$ 3,903
Other real estate owned, net		$ 18
Northwest Bank Branches [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net of Allowance	108,100		$ 122,862
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Allowance	$ 1,800

Allowance For Loan Losses, As A percentage Of Total Loans

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Allowance

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Business combination recognized identifiable assets acquired and liabilities assumed financing receivable net of allowance

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Financing receivable origination fee, net.

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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Amount of increase (decrease) in loans and leases receivable due from related parties.

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Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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