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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Acquisition of PFG | $ 2,497 |  |  |
Balance, gross core deposit intangible | 17,047 |  |  |
Finite Lived Intangible Assets Accumulated Amortization [Abstract] |  |  |  |
Gross Carrying Amount | 17,047 |  | $ 17,047 | $ 14,550
Less: accumulated amortization |  | $ (5,155) | (4,711) |
Total |  | 11,892 | 12,336 |
Core Deposits [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Balance, beginning of period | 14,550 |  |  |
Acquisition of PFG | 1,370 |  |  |
Balance, gross core deposit intangible | 15,920 |  |  |
Finite Lived Intangible Assets Accumulated Amortization [Abstract] |  |  |  |
Gross Carrying Amount | 15,920 |  | 15,920 |
Less: accumulated amortization |  | (4,935) | (4,540) |
Total |  | 10,985 | 11,380 |
Customer Relationships [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Acquisition of PFG | 1,064 |  |  |
Balance, gross core deposit intangible | 1,064 |  |  |
Finite Lived Intangible Assets Accumulated Amortization [Abstract] |  |  |  |
Gross Carrying Amount | 1,064 |  | 1,064 |
Less: accumulated amortization |  | (206) | (161) |
Total |  | 858 | 903 |
Trade Names [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Acquisition of PFG | 63 |  |  |
Balance, gross core deposit intangible | 63 |  |  |
Finite Lived Intangible Assets Accumulated Amortization [Abstract] |  |  |  |
Gross Carrying Amount | $ 63 |  | 63 |
Less: accumulated amortization |  | (14) | (10) |
Total |  | $ 49 | $ 53 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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