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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Information related to available for sale securities |  |
Amortized Cost | $ 1,639,941,000 | $ 1,376,969,000
Gross Unrealized Gain | 5,288,000 | 30,244,000
Gross Unrealized Losses | (122,694,000) | (8,655,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 1,522,535,000 | 1,398,558,000
U.S. Treasury securities |  |
Information related to available for sale securities |  |
Amortized Cost | 2,250,000 | 900,000
Gross Unrealized Gain | 0 | 0
Gross Unrealized Losses | (4,000) | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 2,246,000 | 900,000
U.S. government sponsored agencies |  |
Information related to available for sale securities |  |
Amortized Cost | 164,514,000 | 145,858,000
Gross Unrealized Gain | 0 | 39,000
Gross Unrealized Losses | (11,622,000) | (2,445,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 152,892,000 | 143,452,000
Mortgage-backed securities: residential |  |
Information related to available for sale securities |  |
Amortized Cost | 634,654,000 | 487,157,000
Gross Unrealized Gain | 680,000 | 4,455,000
Gross Unrealized Losses | (39,013,000) | (4,936,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 596,321,000 | 486,676,000
Mortgage-backed securities: commercial |  |
Information related to available for sale securities |  |
Amortized Cost | 96,000 | 522,000
Gross Unrealized Gain | 0 | 1,000
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 96,000 | 523,000
State and municipal securities |  |
Information related to available for sale securities |  |
Amortized Cost | 838,427,000 | 742,532,000
Gross Unrealized Gain | 4,608,000 | 25,749,000
Gross Unrealized Losses | (72,055,000) | (1,274,000)
Allowance for Credit Losses | 0 | 0
Fair Value | $ 770,980,000 | $ 767,007,000

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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=123581744&loc=d3e27161-111563 + Details
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