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LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | $ 4,244 | $ 8,851 | $ 4,244 | $ 8,851 | $ 9,280
Unpaid Principal Balance - with an allowance recorded | 4,244 | 8,851 | 4,244 | 8,851 | 9,280
Related Allowance | 756 | 1,934 | 756 | 1,934 | 2,009
Average Recorded Investment - with an allowance recorded | 4,282 | 9,866 | 5,088 | 13,373 | 12,257
Interest Income Recognized - with an allowance recorded | 33 | 52 | 113 | 118 | 153
Recorded Investment - without allowance recorded | 7,868 | 4,579 | 7,868 | 4,579 | 4,310
Unpaid Principal Balance - without allowance recorded | 9,682 | 6,478 | 9,682 | 6,478 | 6,216
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded | 8,069 | 4,552 | 6,098 | 4,832 | 4,709
Interest Income Recognized - without allowance recorded | 15 | 21 | 33 | 51 | 62
Impaired Financing Receivable, Recorded Investment | 12,112 | 13,430 | 12,112 | 13,430 | 13,590
Impaired financing receivable, unpaid principal balance | 13,926 | 15,329 | 13,926 | 15,329 | 15,496
Impaired Financing Receivable, Average Recorded Investment | 12,351 | 14,418 | 11,186 | 18,205 | 16,966
Impaired Financing Receivable, Interest Income, Accrual Method | 48 | 73 | 146 | 169 | 215
Residential Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 3,577 | 3,262 | 3,577 | 3,262 | 3,858
Unpaid Principal Balance - with an allowance recorded | 3,577 | 3,262 | 3,577 | 3,262 | 3,858
Related Allowance | 619 | 464 | 619 | 464 | 568
Average Recorded Investment - with an allowance recorded | 3,541 | 3,194 | 2,428 | 3,084 | 3,177
Interest Income Recognized - with an allowance recorded | 27 | 48 | 96 | 103 | 131
Recorded Investment - without allowance recorded | 1,607 | 1,530 | 1,607 | 1,530 | 1,313
Unpaid Principal Balance - without allowance recorded | 1,807 | 1,949 | 1,807 | 1,949 | 1,673
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded | 1,750 | 1,427 | 1,582 | 1,349 | 1,345
Interest Income Recognized - without allowance recorded | 13 | 15 | 27 | 15 | 15
Commercial Real Estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 349 | 5,589 | 349 | 5,589 | 5,422
Unpaid Principal Balance - with an allowance recorded | 349 | 5,589 | 349 | 5,589 | 5,422
Related Allowance | 23 | 1,470 | 23 | 1,470 | 1,441
Average Recorded Investment - with an allowance recorded | 350 | 6,590 | 2,428 | 10,048 | 8,900
Interest Income Recognized - with an allowance recorded | 6 | 4 | 17 | 15 | 22
Recorded Investment - without allowance recorded | 4,658 | 784 | 4,658 | 784 | 777
Unpaid Principal Balance - without allowance recorded | 4,944 | 1,032 | 4,944 | 1,032 | 1,084
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded | 4,700 | 794 | 2,637 | 1,250 | 1,132
Interest Income Recognized - without allowance recorded |  | 15 |  | 22 | 29
Commercial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment - with an allowance recorded |  | 82 |  | 41 | 31
Recorded Investment - without allowance recorded | 1,548 | 1,842 | 1,548 | 1,842 | 1,791
Unpaid Principal Balance - without allowance recorded | 2,725 | 3,015 | 2,725 | 3,015 | 2,964
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded | 1,580 | 1,891 | 1,666 | 1,959 | 1,920
Interest Income Recognized - without allowance recorded | 2 | (6) | 6 | 8 | 10
Home Equity |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 318 | 0 | 318 | 0 | 0
Unpaid Principal Balance - with an allowance recorded | 318 | 0 | 318 | 0 | 0
Related Allowance | 114 | 0 | 114 | 0 | 0
Average Recorded Investment - with an allowance recorded | 391 |  | 232 | 167 | 125
Recorded Investment - without allowance recorded | 55 | 423 | 55 | 423 | 429
Unpaid Principal Balance - without allowance recorded | 206 | 482 | 206 | 482 | 495
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded | 39 | 440 | 213 | 271 | 310
Interest Income Recognized - without allowance recorded |  | 1 |  | 6 | 8
Consumer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment - with an allowance recorded |  |  |  |  | 0
Recorded Investment - without allowance recorded | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance - without allowance recorded | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable With No Related Allowance Related Allowance | 0 | 0 | 0 | 0 |
Average Recorded Investment - without allowance recorded |  |  |  | 3 | 2
Interest Income Recognized - without allowance recorded |  | (4) |  |  |
HPFC Portfolio Segment |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance - with an allowance recorded | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment - with an allowance recorded |  |  |  | 33 | 24
Recorded Investment - without allowance recorded | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance - without allowance recorded | 0 | 0 | 0 | 0 | 0
Impaired Financing Receivable With No Related Allowance Related Allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Average Recorded Investment - without allowance recorded |  |  |  |  | $ 0

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