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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 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 16,833,653 | $ 16,142,124
90 Days Past Due & Accruing | 738 | 507
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,190 | 38,416
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 40,185 | 26,886
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 65,375 | 65,302
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,768,278 | 16,076,822
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 357,785 | 349,810
90 Days Past Due & Accruing | 426 | 225
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,883 | 2,149
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 740 | 623
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,623 | 2,772
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 354,162 | 347,038
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 209,452 | 196,928
90 Days Past Due & Accruing | 426 | 225
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,666 | 1,297
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 495 | 409
Consumer | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,161 | 1,706
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 207,291 | 195,222
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 148,333 | 152,882
90 Days Past Due & Accruing | 0 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,217 | 852
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 245 | 214
Consumer | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,462 | 1,066
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 146,871 | 151,816
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,110,081 | 12,581,262
90 Days Past Due & Accruing | 28 | 106
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,070 | 31,061
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,688 | 18,618
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 35,758 | 49,679
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,074,323 | 12,531,583
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,930,586 | 2,566,649
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 | 1,273 | 4,677
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,233 | 443
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,506 | 5,120
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,926,080 | 2,561,529
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,633,365 | 2,546,115
90 Days Past Due & Accruing | 28 | 106
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,035 | 23,625
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,022 | 11,075
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 19,057 | 34,700
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,614,308 | 2,511,415
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,546,130 | 7,468,498
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,762 | 2,759
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,433 | 7,100
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,195 | 9,859
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,533,935 | 7,458,639
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,849,871 | 2,837,913
90 Days Past Due & Accruing | 284 | 176
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,237 | 5,145
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20,754 | 7,642
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,991 | 12,787
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,823,880 | 2,825,126
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,569,330 | 2,632,290
90 Days Past Due & Accruing | 284 | 176
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,990 | 5,034
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,776 | 7,575
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 23,766 | 12,609
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,545,564 | 2,619,681
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 280,541 | 205,623
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 247 | 111
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,978 | 67
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,225 | 178
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 278,316 | 205,445
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 515,916 | 373,139
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 61
Other | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 3
Other | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 64
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 515,913 | $ 373,075

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