Loans and Allowance for Credit Losses - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	$ 62,670	$ 68,204
Consumer
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	659	758
Consumer | Credit cards
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	325	377
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	334	381
Real Estate
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	44,619	48,517
Real Estate | Construction and development
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	3,292	2,296
Real Estate | Single family residential
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	21,046	19,268
Real Estate | Other commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	20,281	26,953
Commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	17,379	18,926
Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	17,237	18,774
Commercial | Agricultural
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	142	152
Other
Financing Receivable, Past Due [Line Items]
Loans in nonaccrual status	$ 13	$ 3