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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 |  |

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