Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	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	4	5
Extended Maturity and Payment Deferral | COVID-19 Pandemic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	51	3,729
Troubled debt, balance | $	$ 8,600	$ 2,990,000
Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	49	54
Troubled debt, balance | $	$ 6,939	$ 7,513
Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	31	32
Troubled debt, balance | $	$ 4,289	$ 3,138
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	18	22
Troubled debt, balance | $	$ 2,650	$ 4,375
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	4	5
Real Estate | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	45	48
Troubled debt, balance | $	$ 5,097	$ 5,260
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	29	29
Troubled debt, balance | $	$ 3,853	$ 2,512
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	16	19
Troubled debt, balance | $	$ 1,244	$ 2,748
Real Estate | Single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	3	5
Real Estate | Single family residential | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	42	46
Troubled debt, balance | $	$ 4,283	$ 5,199
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	28	28
Troubled debt, balance | $	$ 3,087	$ 2,463
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	14	18
Troubled debt, balance | $	$ 1,196	$ 2,736
Real Estate | Other commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	1
Real Estate | Other commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	3	2
Troubled debt, balance | $	$ 814	$ 61
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	1	1
Troubled debt, balance | $	$ 766	$ 49
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	2	1
Troubled debt, balance | $	$ 48	$ 12
Commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	4	6
Troubled debt, balance | $	$ 1,842	$ 2,253
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	2	3
Troubled debt, balance | $	$ 436	$ 626
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	2	3
Troubled debt, balance | $	$ 1,406	$ 1,627
Commercial | Commercial | Loans, Excluding Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	4	6
Troubled debt, balance | $	$ 1,842	$ 2,253
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	2	3
Troubled debt, balance | $	$ 436	$ 626
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDR loans	2	3
Troubled debt, balance | $	$ 1,406	$ 1,627