Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) - Loans, Excluding Acquired Loans $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	43	49
Troubled debt, balance | $	$ 6,042	$ 6,939
Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	26	31
Troubled debt, balance | $	$ 3,424	$ 4,289
Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	17	18
Troubled debt, balance | $	$ 2,618	$ 2,650
Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	39	45
Troubled debt, balance | $	$ 4,211	$ 5,097
Real Estate | Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	24	29
Troubled debt, balance | $	$ 2,998	$ 3,853
Real Estate | Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	15	16
Troubled debt, balance | $	$ 1,213	$ 1,244
Real Estate | Single family residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	37	42
Troubled debt, balance | $	$ 3,405	$ 4,283
Real Estate | Single family residential | Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	23	28
Troubled debt, balance | $	$ 2,238	$ 3,087
Real Estate | Single family residential | Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	14	14
Troubled debt, balance | $	$ 1,167	$ 1,196
Real Estate | Other commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	2	3
Troubled debt, balance | $	$ 806	$ 814
Real Estate | Other commercial | Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	1	1
Troubled debt, balance | $	$ 760	$ 766
Real Estate | Other commercial | Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	1	2
Troubled debt, balance | $	$ 46	$ 48
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	4	4
Troubled debt, balance | $	$ 1,831	$ 1,842
Commercial | Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	2	2
Troubled debt, balance | $	$ 426	$ 436
Commercial | Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	2	2
Troubled debt, balance | $	$ 1,405	$ 1,406
Commercial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	4	4
Troubled debt, balance | $	$ 1,831	$ 1,842
Commercial | Commercial | Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	2	2
Troubled debt, balance | $	$ 426	$ 436
Commercial | Commercial | Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loan modifications | loan	2	2
Troubled debt, balance | $	$ 1,405	$ 1,406