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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 584,507 | $ 684,087
Gross Unrealized Gains | 8,508 | 2,293
Gross Unrealized Losses | (611) | (6,854)
Fair Value | 592,404 | 679,526
Held-to-maturity |  |
Amortized Cost | 88,477 | 121,715
Gross Unrealized Gains | 2,276 | 1,326
Gross Unrealized Losses | (224) | (1,535)
Fair Value | 90,529 | 121,506
U.S. government agency |  |
Available-for-sale |  |
Amortized Cost | 49,113 | 46,977
Gross Unrealized Gains | 529 | 250
Gross Unrealized Losses | (27) | (361)
Fair Value | 49,615 | 46,866
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 131,241 | 161,957
Gross Unrealized Gains | 2,503 | 761
Gross Unrealized Losses | (6) | (1,268)
Fair Value | 133,738 | 161,450
Held-to-maturity |  |
Amortized Cost | 45,239 | 73,176
Gross Unrealized Gains | 1,340 | 1,149
Gross Unrealized Losses |  | (42)
Fair Value | 46,579 | 74,283
Mortgage-backed: Agency residential |  |
Available-for-sale |  |
Amortized Cost | 198,184 | 235,903
Gross Unrealized Gains | 2,780 | 788
Gross Unrealized Losses | (286) | (2,388)
Fair Value | 200,678 | 234,303
Held-to-maturity |  |
Amortized Cost | 19,072 | 23,192
Gross Unrealized Gains | 161 |
Gross Unrealized Losses | (170) | (998)
Fair Value | 19,063 | 22,194
Mortgage-backed: Agency commercial |  |
Available-for-sale |  |
Amortized Cost | 133,730 | 151,878
Gross Unrealized Gains | 1,516 | 285
Gross Unrealized Losses | (292) | (2,082)
Fair Value | 134,954 | 150,081
Held-to-maturity |  |
Amortized Cost | 24,166 | 25,347
Gross Unrealized Gains | 775 | 177
Gross Unrealized Losses | (54) | (495)
Fair Value | 24,887 | 25,029
Mortgage-backed: Private-label |  |
Available-for-sale |  |
Amortized Cost |  | 254
Gross Unrealized Gains |  | 2
Fair Value |  | 256
Corporate |  |
Available-for-sale |  |
Amortized Cost | 72,239 | 87,118
Gross Unrealized Gains | 1,180 | 207
Gross Unrealized Losses |  | (755)
Fair Value | $ 73,419 | $ 86,570

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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=118939692&loc=d3e27161-111563 + Details
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