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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 1,376,969 | $ 697,906
Gross Unrealized Gain | 30,244 | 37,045
Gross Unrealized Losses | (8,655) | (106)
Fair Value | 1,398,558 | 734,845
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 900 |
Gross Unrealized Gain | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 900 |
U.S. government sponsored agencies |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 145,858 | 36,492
Gross Unrealized Gain | 39 | 56
Gross Unrealized Losses | (2,445) | (61)
Fair Value | 143,452 | 36,487
Mortgage-backed securities: residential |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 487,157 | 270,231
Gross Unrealized Gain | 4,455 | 9,289
Gross Unrealized Losses | (4,936) | (17)
Fair Value | 486,676 | 279,503
Mortgage-backed securities: commercial |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 522 | 35,877
Gross Unrealized Gain | 1 | 1,004
Gross Unrealized Losses | 0 | 0
Fair Value | 523 | 36,881
State and municipal securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 742,532 | 355,306
Gross Unrealized Gain | 25,749 | 26,696
Gross Unrealized Losses | (1,274) | (28)
Fair Value | $ 767,007 | $ 381,974

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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