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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, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Total Past Due $ 78,303 $ 74,260
Current 12,117,570 12,826,637
Total 12,195,873 12,900,897
90 Days Past Due & Accruing 635 578
Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 49,687 39,072
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 28,616 35,188
Consumer    
Financing Receivable, Past Due [Line Items]    
Total Past Due 2,789 4,037
Current 345,634 387,187
Total 348,423 391,224
90 Days Past Due & Accruing 421 269
Consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 2,007 3,479
Consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 782 558
Consumer | Credit cards    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,239 964
Current 174,219 187,881
Total 175,458 188,845
90 Days Past Due & Accruing 336 256
Consumer | Credit cards | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 786 708
Consumer | Credit cards | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 453 256
Total 453 256
Consumer | Other consumer    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,550 3,073
Current 171,415 199,306
Total 172,965 202,379
90 Days Past Due & Accruing 85 13
Consumer | Other consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,221 2,771
Consumer | Other consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 329 302
Total 329 302
Real Estate    
Financing Receivable, Past Due [Line Items]    
Total Past Due 62,942 54,775
Current 8,756,965 9,169,016
Total 8,819,907 9,223,791
90 Days Past Due & Accruing 38 253
Real Estate | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 41,765 27,761
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 21,177 27,014
Real Estate | Construction and development    
Financing Receivable, Past Due [Line Items]    
Total Past Due 4,875 4,464
Current 1,446,966 1,591,791
Total 1,451,841 1,596,255
90 Days Past Due & Accruing 3 0
Real Estate | Construction and development | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 3,296 1,375
Real Estate | Construction and development | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 1,579 3,089
Real Estate | Single family residential    
Financing Receivable, Past Due [Line Items]    
Total Past Due 28,642 38,065
Current 1,701,414 1,842,608
Total 1,730,056 1,880,673
90 Days Past Due & Accruing 21 253
Real Estate | Single family residential | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 17,836 23,726
Real Estate | Single family residential | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 10,806 14,339
Total 10,806 14,339
Real Estate | Other commercial    
Financing Receivable, Past Due [Line Items]    
Total Past Due 29,425 12,246
Current 5,608,585 5,734,617
Total 5,638,010 5,746,863
90 Days Past Due & Accruing 14 0
Real Estate | Other commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 20,633 2,660
Real Estate | Other commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 8,792 9,586
Commercial    
Financing Receivable, Past Due [Line Items]    
Total Past Due 12,549 15,356
Current 2,588,072 2,734,935
Total 2,600,621 2,750,291
90 Days Past Due & Accruing 176 56
Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 5,892 7,740
Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 6,657 7,616
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Total Past Due 11,817 14,943
Current 2,432,883 2,559,443
Total 2,444,700 2,574,386
90 Days Past Due & Accruing 170 56
Commercial | Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 5,572 7,514
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 6,245 7,429
Commercial | Agricultural    
Financing Receivable, Past Due [Line Items]    
Total Past Due 732 413
Current 155,189 175,492
Total 155,921 175,905
90 Days Past Due & Accruing 6 0
Commercial | Agricultural | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 320 226
Commercial | Agricultural | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 412 187
Other    
Financing Receivable, Past Due [Line Items]    
Total Past Due 23 92
Current 426,899 535,499
Total 426,922 535,591
90 Days Past Due & Accruing 0 0
Other | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 23 92
Other | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Total Past Due 0 $ 0
Total $ 0