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FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) - Non-recurring - Level 3 - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Quantitative information about the significant unobservable inputs within Level 3 |  |
Impaired loans | $ 22,766,000 | $ 23,853,000
Capitalized servicing rights | 12,400,000 | 12,527,000
Total | 35,166,000 | 36,380,000
Impaired Loans | Fair Value of Collateral |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Impaired loans | $ 22,766,000 | $ 23,853,000
Impaired Loans | Minimum | Fair Value of Collateral |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Loss severity (as percent) | 0.08% | 0.21%
Appraised value | $ 10,600 | $ 10,900
Impaired Loans | Maximum | Fair Value of Collateral |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Loss severity (as percent) | 38.43% | 38.72%
Appraised value | $ 5,946,000 | $ 5,967,000
Impaired Loans | Weighted Average | Fair Value of Collateral |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Loss severity (as percent) | 2.41% | 3.40%
Appraised value | $ 2,143,000 | $ 2,197,000
Capitalized Servicing Rights | Discounted Cash Flow |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Capitalized servicing rights | $ 12,400,000 | $ 12,527,000
Capitalized Servicing Rights | Minimum | Discounted Cash Flow |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Constant prepayment rate (CPR) (as percent) |  | 7.78%
Discount Rate (as percent) |  | 10.00%
Capitalized Servicing Rights | Maximum | Discounted Cash Flow |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Constant prepayment rate (CPR) (as percent) |  | 12.78%
Discount Rate (as percent) |  | 13.28%
Capitalized Servicing Rights | Weighted Average | Discounted Cash Flow |  |
Quantitative information about the significant unobservable inputs within Level 3 |  |
Constant prepayment rate (CPR) (as percent) |  | 10.38%
Discount Rate (as percent) |  | 11.72%

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- Definition Represents the amount of impaired loans assets reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
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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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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + 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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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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