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Loans and Allowance for Credit Losses - Age Analysis of Past Due 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 $ 12,028,593 $ 12,012,503
90 Days Past Due & Accruing 240 349
Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 31,133 20,722
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 29,145 32,907
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 60,278 53,629
Current    
Financing Receivable, Past Due [Line Items]    
Loans 11,968,315 11,958,874
Consumer    
Financing Receivable, Past Due [Line Items]    
Loans 364,974 355,370
90 Days Past Due & Accruing 238 247
Consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,923 1,996
Consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 454 543
Consumer | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,377 2,539
Consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 362,597 352,831
Consumer | Credit cards    
Financing Receivable, Past Due [Line Items]    
Loans 184,372 187,052
90 Days Past Due & Accruing 238 247
Consumer | Credit cards | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 840 847
Consumer | Credit cards | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 362 413
Consumer | Credit cards | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,202 1,260
Consumer | Credit cards | Current    
Financing Receivable, Past Due [Line Items]    
Loans 183,170 185,792
Consumer | Other consumer    
Financing Receivable, Past Due [Line Items]    
Loans 180,602 168,318
90 Days Past Due & Accruing 0 0
Consumer | Other consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,083 1,149
Consumer | Other consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 92 130
Consumer | Other consumer | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,175 1,279
Consumer | Other consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 179,427 167,039
Real Estate    
Financing Receivable, Past Due [Line Items]    
Loans 9,228,990 9,167,250
90 Days Past Due & Accruing 0 102
Real Estate | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 24,376 13,901
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 20,407 22,170
Real Estate | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 44,783 36,071
Real Estate | Current    
Financing Receivable, Past Due [Line Items]    
Loans 9,184,207 9,131,179
Real Estate | Construction and development    
Financing Receivable, Past Due [Line Items]    
Loans 1,423,445 1,326,371
90 Days Past Due & Accruing 0 0
Real Estate | Construction and development | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 426 114
Real Estate | Construction and development | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 118 504
Real Estate | Construction and development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 544 618
Real Estate | Construction and development | Current    
Financing Receivable, Past Due [Line Items]    
Loans 1,422,901 1,325,753
Real Estate | Single family residential    
Financing Receivable, Past Due [Line Items]    
Loans 2,042,978 2,101,975
90 Days Past Due & Accruing 0 102
Real Estate | Single family residential | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 18,273 11,313
Real Estate | Single family residential | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 8,546 9,398
Real Estate | Single family residential | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 26,819 20,711
Real Estate | Single family residential | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,016,159 2,081,264
Real Estate | Other commercial    
Financing Receivable, Past Due [Line Items]    
Loans 5,762,567 5,738,904
90 Days Past Due & Accruing 0 0
Real Estate | Other commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 5,677 2,474
Real Estate | Other commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 11,743 12,268
Real Estate | Other commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 17,420 14,742
Real Estate | Other commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 5,745,147 5,724,162
Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,166,870 2,160,760
90 Days Past Due & Accruing 2 0
Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 4,817 4,825
Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 8,281 10,191
Commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 13,098 15,016
Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,153,772 2,145,744
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,016,405 1,992,043
90 Days Past Due & Accruing 2 0
Commercial | Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 4,707 4,812
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 8,082 10,074
Commercial | Commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 12,789 14,886
Commercial | Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,003,616 1,977,157
Commercial | Agricultural    
Financing Receivable, Past Due [Line Items]    
Loans 150,465 168,717
90 Days Past Due & Accruing 0 0
Commercial | Agricultural | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 110 13
Commercial | Agricultural | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 199 117
Commercial | Agricultural | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 309 130
Commercial | Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Loans 150,156 168,587
Other    
Financing Receivable, Past Due [Line Items]    
Loans 267,759 329,123
90 Days Past Due & Accruing 0 0
Other | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 17 0
Other | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3 3
Other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 20 3
Other | Current    
Financing Receivable, Past Due [Line Items]    
Loans $ 267,739 $ 329,120