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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Information related to available for sale securities |  |
Amortized Cost | $ 1,224,229,000 |
Amortized Cost |  | $ 697,906,000
Gross Unrealized Gain | 26,966,000 | 37,045,000
Gross Unrealized Losses | (11,480,000) | (106,000)
Allowance for Credit Losses | 0 |
Allowance for Credit Losses |  | 0
Fair Value | 1,239,715,000 |
Fair Value |  | 734,845,000
U.S. Treasury securities |  |
Information related to available for sale securities |  |
Amortized Cost | 900,000 |
Gross Unrealized Gain | 0 |
Gross Unrealized Losses | 0 |
Allowance for Credit Losses | 0 |
Fair Value | 900,000 |
U.S. government sponsored agencies |  |
Information related to available for sale securities |  |
Amortized Cost | 118,681,000 |
Amortized Cost |  | 36,492,000
Gross Unrealized Gain | 17,000 | 56,000
Gross Unrealized Losses | (2,237,000) | (61,000)
Allowance for Credit Losses | 0 |
Allowance for Credit Losses |  | 0
Fair Value | 116,461,000 |
Fair Value |  | 36,487,000
Mortgage-backed securities: residential |  |
Information related to available for sale securities |  |
Amortized Cost | 430,388,000 |
Amortized Cost |  | 270,231,000
Gross Unrealized Gain | 5,511,000 | 9,289,000
Gross Unrealized Losses | (4,066,000) | (17,000)
Allowance for Credit Losses | 0 |
Allowance for Credit Losses |  | 0
Fair Value | 431,833,000 |
Fair Value |  | 279,503,000
Mortgage-backed securities: commercial |  |
Information related to available for sale securities |  |
Amortized Cost | 23,699,000 |
Amortized Cost |  | 35,877,000
Gross Unrealized Gain | 483,000 | 1,004,000
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Allowance for Credit Losses |  | 0
Fair Value | 24,182,000 |
Fair Value |  | 36,881,000
State and municipal securities |  |
Information related to available for sale securities |  |
Amortized Cost | 650,561,000 |
Amortized Cost |  | 355,306,000
Gross Unrealized Gain | 20,955,000 | 26,696,000
Gross Unrealized Losses | (5,177,000) | (28,000)
Allowance for Credit Losses | 0 |
Allowance for Credit Losses |  | 0
Fair Value | $ 666,339,000 |
Fair Value |  | $ 381,974,000

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