Loans and Allowance for Credit Losses - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	$ 64,096	$ 68,204
Consumer
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	793	758
Consumer | Credit cards
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	435	377
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	358	381
Real Estate
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	49,327	48,517
Real Estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	1,746	2,296
Real Estate | Single family residential
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	20,060	19,268
Real Estate | Other commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	27,521	26,953
Commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	13,973	18,926
Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	13,726	18,774
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	247	152
Other
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	$ 3	$ 3