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Investment Securities - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 30 |
Available-for-sale securities in unrealized loss position less than 12 months | $ | $ 574,000,000 |
Number of available-for-sale securities in unrealized loss position 12 months or greater | Security | 2 |
Available-for-sale securities in unrealized loss position 12 months or greater | $ | $ 131,000,000 |
Sales of available-for-sale securities | Security | 0 |
Proceeds from sales of investment securities available-for-sale | $ | $ 0 | $ 1,676,000
Gross realized gain on sale of available-for-sale securities | $ |  | 20,000
Carrying value of available-for-sale securities pledged to secure public deposits | $ | 48,557,000 | 24,005,000
Collateral Pledged |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 2,800,000 | 2,300,000
U.S. Treasury or Agency Bonds |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 8 |
Government Agency Mortgage-Backed Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 14 |
Carrying value of available-for-sale securities pledged to secure public deposits | $ | $ 21,339,000 | $ 9,532,000
Municipal Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 2 |
Trust Preferred Securities or Subordinated Debentures |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Number of available-for-sale securities in unrealized loss position less than 12 months | Security | 8 |

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- Definition Amount 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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