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SECURITIES AVAILABLE FOR SALE - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 496,282 | $ 411,706
Gross Unrealized Gains | 1,811 | 7,496
Gross Unrealized Losses | 8,737 | 3,894
Fair Value | 489,356 | 415,308
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 161,146 | 153,803
Gross Unrealized Gains | 1,251 | 6,133
Gross Unrealized Losses | 2,977 | 478
Fair Value | 159,420 | 159,458
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 48,600
Gross Unrealized Gains |  | 930
Gross Unrealized Losses |  | 0
Fair Value |  | 49,530
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,335 | 113,658
Gross Unrealized Gains | 39 | 296
Gross Unrealized Losses | 4,720 | 2,835
Fair Value | 108,654 | 111,119
Private label residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 313 | 999
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | 1 | 0
Fair Value | 312 | 1,003
Private label commercial CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 61,560 | 7,809
Gross Unrealized Gains | 18 | 0
Gross Unrealized Losses | 368 | 156
Fair Value | 61,210 | 7,653
Asset-backed and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159,928 | 86,837
Gross Unrealized Gains | 503 | 133
Gross Unrealized Losses | 671 | 425
Fair Value | $ 159,760 | $ 86,545

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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