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SECURITIES - Summary of Available For Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Information related to available for sale securities |  |  |
Amortized Cost | $ 819,540 | $ 697,906 |
Gross Unrealized Gain | 27,380 | 37,045 |
Gross Unrealized Losses | (6,491) | (106) |
Allowance for credit losses | 0 | 0 |
Fair Value | 840,429 | 734,845 | $ 734,845
U.S. Treasury securities |  |  |
Information related to available for sale securities |  |  |
Amortized Cost | 900 |  |
Gross Unrealized Gain | 0 |  |
Gross Unrealized Losses | 0 |  |
Allowance for credit losses | 0 |  |
Fair Value | 900 |  |
U.S. government sponsored agencies |  |  |
Information related to available for sale securities |  |  |
Amortized Cost | 36,150 | 36,492 |
Gross Unrealized Gain | 0 | 56 |
Gross Unrealized Losses | (1,260) | (61) |
Allowance for credit losses | 0 | 0 |
Fair Value | 34,890 | 36,487 |
Mortgage-backed securities residential [Member] |  |  |
Information related to available for sale securities |  |  |
Amortized Cost | 344,668 | 270,231 |
Gross Unrealized Gain | 6,903 | 9,289 |
Gross Unrealized Losses | (4,239) | (17) |
Allowance for credit losses | 0 | 0 |
Fair Value | 347,332 | 279,503 |
Mortgage-backed securities commercial [Member] |  |  |
Information related to available for sale securities |  |  |
Amortized Cost | 35,220 | 35,877 |
Gross Unrealized Gain | 700 | 1,004 |
Gross Unrealized Losses | (2) | 0 |
Allowance for credit losses | 0 | 0 |
Fair Value | 35,918 | 36,881 |
State and Municipal Securities [Member] |  |  |
Information related to available for sale securities |  |  |
Amortized Cost | 402,602 | 355,306 |
Gross Unrealized Gain | 19,777 | 26,696 |
Gross Unrealized Losses | (990) | (28) |
Allowance for credit losses | 0 | 0 |
Fair Value | $ 421,389 | $ 381,974 |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: 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=121558606&loc=SL82898722-210454 + Details
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