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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Available-for-sale |  |
Amortized Cost | $ 600,066 | $ 584,507
Gross Unrealized Gains | 16,762 | 8,508
Gross Unrealized Losses | (1,263) | (611)
Fair Value | 615,565 | 592,404
Held-to-maturity |  |
Amortized Cost | 79,741 | 88,477
Gross Unrealized Gains | 3,842 | 2,276
Gross Unrealized Losses | (19) | (224)
Fair Value | 83,564 | 90,529
Total Amortized Cost | 679,807 | 672,984
Total Gross Unrealized Gains | 20,604 | 10,784
Total Gross Unrealized Losses | (1,282) | (835)
Total Fair Value | 699,129 | 682,933
U.S. government agency |  |
Available-for-sale |  |
Amortized Cost | 48,983 | 49,113
Gross Unrealized Gains | 2,192 | 529
Gross Unrealized Losses |  | (27)
Fair Value | 51,175 | 49,615
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 164,853 | 131,241
Gross Unrealized Gains | 3,577 | 2,503
Gross Unrealized Losses | (185) | (6)
Fair Value | 168,245 | 133,738
Held-to-maturity |  |
Amortized Cost | 32,780 | 45,239
Gross Unrealized Gains | 1,198 | 1,340
Fair Value | 33,978 | 46,579
Mortgage-backed: Agency residential |  |
Available-for-sale |  |
Amortized Cost | 184,507 | 198,184
Gross Unrealized Gains | 5,015 | 2,780
Gross Unrealized Losses | (904) | (286)
Fair Value | 188,618 | 200,678
Held-to-maturity |  |
Amortized Cost | 17,989 | 19,072
Gross Unrealized Gains | 471 | 161
Gross Unrealized Losses | (16) | (170)
Fair Value | 18,444 | 19,063
Mortgage-backed: Agency commercial |  |
Available-for-sale |  |
Amortized Cost | 128,583 | 133,730
Gross Unrealized Gains | 4,050 | 1,516
Gross Unrealized Losses | (116) | (292)
Fair Value | 132,517 | 134,954
Held-to-maturity |  |
Amortized Cost | 28,972 | 24,166
Gross Unrealized Gains | 2,173 | 775
Gross Unrealized Losses | (3) | (54)
Fair Value | 31,142 | 24,887
Corporate |  |
Available-for-sale |  |
Amortized Cost | 73,140 | 72,239
Gross Unrealized Gains | 1,928 | 1,180
Gross Unrealized Losses | (58) |
Fair Value | $ 75,010 | $ 73,419

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- Definition Amount of accumulated unrecognized gain on investment in debt security available for sale and held to maturity at amortized cost. + References No definition available. + Details
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