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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, 2022 | Dec. 31, 2021
Available-for-sale |  |
Amortized Cost | $ 972,817 | $ 938,360
Gross Unrealized Gains | 2,004 | 12,796
Gross Unrealized Losses | (40,899) | (8,988)
Fair Value | 933,922 | 942,168
Held-to-maturity |  |
Amortized Cost | 438,054 | 336,185
Gross Unrealized Gains | 611 | 2,796
Gross Unrealized Losses | (22,062) | (2,954)
Fair Value | 416,603 | 336,027
Total Amortized Cost | 1,410,871 | 1,274,545
Total Gross Unrealized Gains | 2,615 | 15,592
Total Gross Unrealized Losses | (62,961) | (11,942)
Total Fair Value | 1,350,525 | 1,278,195
U.S. Treasury |  |
Available-for-sale |  |
Amortized Cost | 169,966 | 109,002
Gross Unrealized Gains |  | 328
Gross Unrealized Losses | (7,329) | (354)
Fair Value | 162,637 | 108,976
U.S. government agency |  |
Available-for-sale |  |
Amortized Cost | 51,182 | 129,269
Gross Unrealized Gains | 16 | 1,303
Gross Unrealized Losses | (1,181) | (2,467)
Fair Value | 50,017 | 128,105
Held-to-maturity |  |
Amortized Cost | 83,407 | 12,349
Gross Unrealized Gains |  | 42
Gross Unrealized Losses | (722) | (51)
Fair Value | 82,685 | 12,340
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 290,714 | 293,837
Gross Unrealized Gains | 603 | 6,144
Gross Unrealized Losses | (15,753) | (2,904)
Fair Value | 275,564 | 297,077
Held-to-maturity |  |
Amortized Cost | 14,251 | 15,666
Gross Unrealized Gains | 350 | 809
Fair Value | 14,601 | 16,475
Mortgage-backed: Agency residential |  |
Available-for-sale |  |
Amortized Cost | 244,721 | 178,236
Gross Unrealized Gains | 604 | 2,149
Gross Unrealized Losses | (7,797) | (919)
Fair Value | 237,528 | 179,466
Held-to-maturity |  |
Amortized Cost | 27,100 | 20,555
Gross Unrealized Gains | 7 | 196
Gross Unrealized Losses | (947) | (102)
Fair Value | 26,160 | 20,649
Mortgage-backed: Agency commercial |  |
Available-for-sale |  |
Amortized Cost | 156,806 | 164,875
Gross Unrealized Gains | 124 | 1,234
Gross Unrealized Losses | (7,619) | (2,048)
Fair Value | 149,311 | 164,061
Held-to-maturity |  |
Amortized Cost | 313,296 | 287,615
Gross Unrealized Gains | 254 | 1,749
Gross Unrealized Losses | (20,393) | (2,801)
Fair Value | 293,157 | 286,563
Corporate |  |
Available-for-sale |  |
Amortized Cost | 59,428 | 63,141
Gross Unrealized Gains | 657 | 1,638
Gross Unrealized Losses | (1,220) | (296)
Fair Value | $ 58,865 | $ 64,483

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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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