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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 478,476 | $ 491,492
Gross Unrealized Gains | 11,076 | 5,582
Gross Unrealized Losses | 11,264 | 6,189
Fair Value | 478,288 | 490,885
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 104,900 | 83,607
Gross Unrealized Gains | 8,042 | 4,288
Gross Unrealized Losses | 235 | 32
Fair Value | 112,707 | 87,863
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,488 |
Gross Unrealized Gains | 90 |
Gross Unrealized Losses | 0 |
Fair Value | 4,578 |
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 60,254 | 67,928
Gross Unrealized Gains | 2,682 | 1,000
Gross Unrealized Losses | 797 | 774
Fair Value | 62,139 | 68,154
Non-agency CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,071 | 17,210
Gross Unrealized Gains | 91 | 0
Gross Unrealized Losses | 0 | 123
Fair Value | 17,162 | 17,087
Private label commercial CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 72,372 | 86,704
Gross Unrealized Gains | 23 | 156
Gross Unrealized Losses | 3,186 | 231
Fair Value | 69,209 | 86,629
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 219,048 | 235,406
Gross Unrealized Gains | 148 | 138
Gross Unrealized Losses | 7,046 | 5,029
Fair Value | 212,150 | 230,515
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 343 | 637
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 343 | $ 637

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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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