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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
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Loans $ 10,825,227 $ 12,900,897
90 Days Past Due & Accruing 334 578
Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 15,646 39,072
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 27,820 35,188
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 43,466 74,260
Current    
Financing Receivable, Past Due [Line Items]    
Loans 10,781,761 12,826,637
Consumer    
Financing Receivable, Past Due [Line Items]    
Loans 358,376 391,224
90 Days Past Due & Accruing 155 269
Consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,676 3,479
Consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 343 558
Consumer | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,019 4,037
Consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 356,357 387,187
Consumer | Credit cards    
Financing Receivable, Past Due [Line Items]    
Loans 175,884 188,845
90 Days Past Due & Accruing 154 256
Consumer | Credit cards | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 751 708
Consumer | Credit cards | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 253 256
Consumer | Credit cards | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,004 964
Consumer | Credit cards | Current    
Financing Receivable, Past Due [Line Items]    
Loans 174,880 187,881
Consumer | Other consumer    
Financing Receivable, Past Due [Line Items]    
Loans 182,492 202,379
90 Days Past Due & Accruing 1 13
Consumer | Other consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 925 2,771
Consumer | Other consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 90 302
Consumer | Other consumer | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,015 3,073
Consumer | Other consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 181,477 199,306
Real Estate    
Financing Receivable, Past Due [Line Items]    
Loans 8,079,343 9,223,791
90 Days Past Due & Accruing 80 253
Real Estate | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 11,693 27,761
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 20,379 27,014
Real Estate | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 32,072 54,775
Real Estate | Current    
Financing Receivable, Past Due [Line Items]    
Loans 8,047,271 9,169,016
Real Estate | Construction and development    
Financing Receivable, Past Due [Line Items]    
Loans 1,229,740 1,596,255
90 Days Past Due & Accruing 5 0
Real Estate | Construction and development | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,854 1,375
Real Estate | Construction and development | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 605 3,089
Real Estate | Construction and development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,459 4,464
Real Estate | Construction and development | Current    
Financing Receivable, Past Due [Line Items]    
Loans 1,226,281 1,591,791
Real Estate | Single family residential    
Financing Receivable, Past Due [Line Items]    
Loans 1,540,701 1,880,673
90 Days Past Due & Accruing 75 253
Real Estate | Single family residential | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 6,546 23,726
Real Estate | Single family residential | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 6,154 14,339
Real Estate | Single family residential | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 12,700 38,065
Real Estate | Single family residential | Current    
Financing Receivable, Past Due [Line Items]    
Loans 1,528,001 1,842,608
Real Estate | Other commercial    
Financing Receivable, Past Due [Line Items]    
Loans 5,308,902 5,746,863
90 Days Past Due & Accruing 0 0
Real Estate | Other commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,293 2,660
Real Estate | Other commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 13,620 9,586
Real Estate | Other commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 15,913 12,246
Real Estate | Other commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 5,292,989 5,734,617
Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,038,640 2,750,291
90 Days Past Due & Accruing 99 56
Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,270 7,740
Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 7,098 7,616
Commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 9,368 15,356
Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,029,272 2,734,935
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 1,821,905 2,574,386
90 Days Past Due & Accruing 99 56
Commercial | Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,130 7,514
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 6,639 7,429
Commercial | Commercial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 8,769 14,943
Commercial | Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 1,813,136 2,559,443
Commercial | Agricultural    
Financing Receivable, Past Due [Line Items]    
Loans 216,735 175,905
90 Days Past Due & Accruing 0 0
Commercial | Agricultural | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 140 226
Commercial | Agricultural | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 459 187
Commercial | Agricultural | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 599 413
Commercial | Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Loans 216,136 175,492
Other    
Financing Receivable, Past Due [Line Items]    
Loans 348,868 535,591
90 Days Past Due & Accruing 0 0
Other | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 7 92
Other | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 7 92
Other | Current    
Financing Receivable, Past Due [Line Items]    
Loans $ 348,861 $ 535,499