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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

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