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FAIR VALUE - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | $ 496,930,000 |  | $ 496,930,000 |  | $ 465,844,000
Purchase of investment |  |  | 150,386,000 | $ 132,373,000 |
Premium amortization |  |  | 41,000 |  |
Specific charges to value the real estate owned | 0 |  | 0 |  | 0
Changes in fair value of OREO still held | 0 | $ 13,000 | 0 | $ 13,000 |
Private label commercial CMOs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 7,330,000 |  | 7,330,000 |  | 7,209,000
Purchase of investment |  |  | 7,213,000 |  |
Premium amortization | 19,000 |  |  |  |
Unrealized gain | 88,000 |  | 199,000 |  |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value liabilities | 0 |  | 0 |  | 0
Fair Value | 496,930,000 |  | 496,930,000 |  | 465,844,000
Allowance for loan losses | 910,000 |  | 910,000 |  | 928,000
Fair Value, Measurements, Recurring | Private label commercial CMOs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | $ 94,428,000 |  | $ 94,428,000 |  | $ 75,045,000

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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