Loans and Allowance for Credit Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	4	5
Balance Prior to TDR	$ 1,058,000	$ 1,948,000
Financial Impact on Date of Restructure		$ 51,300
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	4	5
Balance Prior to TDR	$ 1,058,000	$ 1,948,000
Balance	963,000	1,896,000
Financial Impact on Date of Restructure	0	0
Real Estate | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	0	1,896,000
Real Estate | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 963,000	$ 0
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	3	5
Balance Prior to TDR	$ 274,000	$ 1,948,000
Balance	197,000	1,896,000
Financial Impact on Date of Restructure	0	0
Real Estate | Single family residential | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	0	1,896,000
Real Estate | Single family residential | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 197,000	$ 0
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans | loan	1
Balance Prior to TDR	$ 784,000
Balance	766,000
Financial Impact on Date of Restructure	0
Real Estate | Other commercial | Change in Maturity Date
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	0
Real Estate | Other commercial | Change in Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 766,000