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Investment Securities - Additional Information (Details)	12 Months Ended
	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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