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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs for Non-recurring Assets (Details) - Non-recurring - Level 3 - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | $ 28,638,000 | $ 18,569,000
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | 17,761,000 | 11,657,000
Impaired loans | Fair value of collateral |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | $ 17,761,000 | $ 11,657,000
Impaired loans | Fair value of collateral | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Loss severity (percent) | 0.00% | 0.05%
Appraised value | $ 0 | $ 46,300
Impaired loans | Fair value of collateral | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Loss severity (percent) | 88.70% | 29.50%
Appraised value | $ 2,192,000 | $ 1,962,000
Impaired loans | Fair value of collateral | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Loss severity (percent) | 9.73% | 7.55%
Appraised value | $ 1,026,000 | $ 999,700
Capitalized servicing rights |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | 10,726,000 | 5,187,000
Capitalized servicing rights | Discounted Cash Flow |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | $ 10,726,000 | $ 5,187,000
Capitalized servicing rights | Discounted Cash Flow | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Constant prepayment rate (percent) | 7.35% | 7.17%
Discount Rate (percent) | 10.00% | 10.00%
Capitalized servicing rights | Discounted Cash Flow | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Constant prepayment rate (percent) | 14.28% | 12.06%
Discount Rate (percent) | 14.00% | 15.00%
Capitalized servicing rights | Discounted Cash Flow | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Constant prepayment rate (percent) | 10.44% | 10.02%
Discount Rate (percent) | 11.77% | 10.88%
Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | $ 151,000 | $ 1,725,000
Other real estate owned | Fair value of collateral |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, fair value | 151,000 | 1,725,000
Other real estate owned | Fair value of collateral | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraised value | 101,000 | 39,000
Other real estate owned | Fair value of collateral | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraised value | 129,000 | 1,200,000
Other real estate owned | Fair value of collateral | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraised value | $ 122,000 | $ 919,900

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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