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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized Cost | $ 589,265 | $ 655,888
Gross Unrealized Gains | 18,116 | 11,205
Gross Unrealized Losses | (2,852) | (3,863)
Available for sale securities | 604,529 | 663,230
US Government-sponsored enterprises |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 226,930 | 319,064
Gross Unrealized Gains | 8,683 | 4,985
Gross Unrealized Losses | (441) | (2,080)
Available for sale securities | 235,172 | 321,969
US Government agency |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 92,517 | 98,568
Gross Unrealized Gains | 3,413 | 1,640
Gross Unrealized Losses | (145) | (547)
Available for sale securities | 95,785 | 99,661
Private label |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 20,142 | 20,212
Gross Unrealized Gains | 40 | 68
Gross Unrealized Losses | (579) | (747)
Available for sale securities | 19,603 | 19,533
Obligations of states and political subdivisions thereof |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 149,890 | 139,240
Gross Unrealized Gains | 4,267 | 3,034
Gross Unrealized Losses |  | (268)
Available for sale securities | 154,157 | 142,006
Corporate bonds |  |
Investment Holdings [Line Items] |  |
Amortized Cost | 99,786 | 78,804
Gross Unrealized Gains | 1,713 | 1,478
Gross Unrealized Losses | (1,687) | (221)
Available for sale securities | $ 99,812 | $ 80,061

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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=121645371&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=121645371&loc=d3e27161-111563 + Details
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