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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Available-for-sale |  |
Amortized Cost | $ 887,562 | $ 899,700
Gross Unrealized Gains | 15,460 | 24,260
Gross Unrealized Losses | (6,804) | (1,091)
Fair Value | 896,218 | 922,869
Held-to-maturity |  |
Amortized Cost | 318,730 | 68,395
Gross Unrealized Gains | 4,155 | 4,064
Gross Unrealized Losses | (1,729) | (18)
Fair Value | 321,156 | 72,441
Total Amortized Cost | 1,206,292 | 968,095
Total Gross Unrealized Gains | 19,615 | 28,324
Total Gross Unrealized Losses | (8,533) | (1,109)
Total Fair Value | 1,217,374 | 995,310
U.S. Treasury |  |
Available-for-sale |  |
Amortized Cost | 59,943 |
Gross Unrealized Gains | 374 |
Gross Unrealized Losses | (22) |
Fair Value | 60,295 |
U.S. government agency |  |
Available-for-sale |  |
Amortized Cost | 130,146 | 118,282
Gross Unrealized Gains | 1,842 | 3,720
Gross Unrealized Losses | (2,295) | (9)
Fair Value | 129,693 | 121,993
Held-to-maturity |  |
Amortized Cost | 12,341 |
Gross Unrealized Gains | 124 |
Gross Unrealized Losses | (12) |
Fair Value | 12,453 |
Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 295,251 | 265,309
Gross Unrealized Gains | 6,232 | 9,232
Gross Unrealized Losses | (2,736) | (280)
Fair Value | 298,747 | 274,261
Held-to-maturity |  |
Amortized Cost | 18,667 | 22,484
Gross Unrealized Gains | 998 | 1,390
Fair Value | 19,665 | 23,874
Mortgage-backed: Agency residential |  |
Available-for-sale |  |
Amortized Cost | 172,372 | 198,543
Gross Unrealized Gains | 3,111 | 4,871
Gross Unrealized Losses | (371) | (162)
Fair Value | 175,112 | 203,252
Held-to-maturity |  |
Amortized Cost | 22,065 | 13,031
Gross Unrealized Gains | 354 | 452
Gross Unrealized Losses | (1) |
Fair Value | 22,418 | 13,483
Mortgage-backed: Agency commercial |  |
Available-for-sale |  |
Amortized Cost | 164,999 | 246,649
Gross Unrealized Gains | 2,002 | 4,651
Gross Unrealized Losses | (1,100) | (534)
Fair Value | 165,901 | 250,766
Held-to-maturity |  |
Amortized Cost | 265,657 | 32,880
Gross Unrealized Gains | 2,679 | 2,222
Gross Unrealized Losses | (1,716) | (18)
Fair Value | 266,620 | 35,084
Corporate |  |
Available-for-sale |  |
Amortized Cost | 64,851 | 70,917
Gross Unrealized Gains | 1,899 | 1,786
Gross Unrealized Losses | (280) | (106)
Fair Value | $ 66,470 | $ 72,597

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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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