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Loans and Allowance for Credit Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 12,012,503 $ 12,900,897
Loans other than pass or current    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,516,672 3,682,340
2020 1,525,310 1,019,712
2019 709,683 922,657
2018 656,367 913,379
2017 801,918 658,250
2016 and Prior 1,081,384 612,237
Lines of Credit (“LOC”) Amortized Cost Basis 4,431,020 4,725,168
LOC Converted to Term Loans Amortized Cost Basis 290,149 367,154
Total 12,012,503 12,900,897
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 355,370 391,224
Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 187,052 188,845
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 168,318 202,379
Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 9,167,250 9,223,791
Real Estate | Construction and development    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,326,371 1,596,255
Real Estate | Construction and development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 74,813 165,990
2020 83,729 35,989
2019 28,803 31,279
2018 17,349 15,960
2017 8,505 9,233
2016 and Prior 9,319 4,807
Lines of Credit (“LOC”) Amortized Cost Basis 1,074,617 1,272,870
LOC Converted to Term Loans Amortized Cost Basis 20,285 23,251
Total 1,317,420 1,559,379
Real Estate | Construction and development | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 2,728
2020 0 344
2019 270 259
2018 0 2,107
2017 0 19
2016 and Prior 47 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 9,613
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 317 15,070
Real Estate | Construction and development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 191 294
2020 77 2,069
2019 16 404
2018 54 449
2017 324 342
2016 and Prior 423 320
Lines of Credit (“LOC”) Amortized Cost Basis 5,598 17,914
LOC Converted to Term Loans Amortized Cost Basis 1,951 14
Total 8,634 21,806
Real Estate | Construction and development | Doubtful and loss    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 0
Real Estate | Construction and development | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 75,004 169,012
2020 83,806 38,402
2019 29,089 31,942
2018 17,403 18,516
2017 8,829 9,594
2016 and Prior 9,789 5,127
Lines of Credit (“LOC”) Amortized Cost Basis 1,080,215 1,300,397
LOC Converted to Term Loans Amortized Cost Basis 22,236 23,265
Total 1,326,371 1,596,255
Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,101,975 1,880,673
Real Estate | Other commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,738,904 5,746,863
Real Estate | Other commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,349,746 1,563,245
2020 807,701 525,750
2019 375,824 375,303
2018 267,696 518,534
2017 476,029 372,679
2016 and Prior 537,493 284,098
Lines of Credit (“LOC”) Amortized Cost Basis 1,409,099 1,445,428
LOC Converted to Term Loans Amortized Cost Basis 164,856 181,949
Total 5,388,444 5,266,986
Real Estate | Other commercial | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 28,151 100,085
2020 30,981 4,346
2019 2,799 10,738
2018 6,650 19,943
2017 39,361 26,245
2016 and Prior 4,801 10,608
Lines of Credit (“LOC”) Amortized Cost Basis 38,638 63,305
LOC Converted to Term Loans Amortized Cost Basis 1,608 23,435
Total 152,989 258,705
Real Estate | Other commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 28,137 66,737
2020 10,186 9,418
2019 5,243 24,380
2018 10,806 14,067
2017 30,060 3,744
2016 and Prior 27,107 11,158
Lines of Credit (“LOC”) Amortized Cost Basis 53,860 52,182
LOC Converted to Term Loans Amortized Cost Basis 32,072 39,486
Total 197,471 221,172
Real Estate | Other commercial | Doubtful and loss    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 0
Real Estate | Other commercial | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,406,034 1,730,067
2020 848,868 539,514
2019 383,866 410,421
2018 285,152 552,544
2017 545,450 402,668
2016 and Prior 569,401 305,864
Lines of Credit (“LOC”) Amortized Cost Basis 1,501,597 1,560,915
LOC Converted to Term Loans Amortized Cost Basis 198,536 244,870
Total 5,738,904 5,746,863
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,160,760 2,750,291
Commercial | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,992,043 2,574,386
Commercial | Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 455,499 1,168,085
2020 187,517 154,740
2019 80,486 110,383
2018 57,437 65,757
2017 36,529 35,198
2016 and Prior 57,099 45,568
Lines of Credit (“LOC”) Amortized Cost Basis 1,004,971 803,751
LOC Converted to Term Loans Amortized Cost Basis 41,885 56,648
Total 1,921,423 2,440,130
Commercial | Commercial | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 670 5,707
2020 2,482 342
2019 1,066 465
2018 189 972
2017 261 54
2016 and Prior 2,770 0
Lines of Credit (“LOC”) Amortized Cost Basis 8,500 12,318
LOC Converted to Term Loans Amortized Cost Basis 10,499 22,546
Total 26,437 42,404
Commercial | Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,436 23,227
2020 18,381 4,495
2019 4,397 1,586
2018 1,196 730
2017 578 276
2016 and Prior 850 334
Lines of Credit (“LOC”) Amortized Cost Basis 8,242 53,682
LOC Converted to Term Loans Amortized Cost Basis 7,103 7,522
Total 44,183 91,852
Commercial | Commercial | Doubtful and loss    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 0
Commercial | Commercial | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 459,605 1,197,019
2020 208,380 159,577
2019 85,949 112,434
2018 58,822 67,459
2017 37,368 35,528
2016 and Prior 60,719 45,902
Lines of Credit (“LOC”) Amortized Cost Basis 1,021,713 869,751
LOC Converted to Term Loans Amortized Cost Basis 59,487 86,716
Total 1,992,043 2,574,386
Commercial | Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 168,717 175,905
Commercial | Agricultural | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 32,780 36,128
2020 20,230 19,144
2019 10,253 10,014
2018 3,646 4,671
2017 2,364 1,916
2016 and Prior 459 340
Lines of Credit (“LOC”) Amortized Cost Basis 98,245 101,238
LOC Converted to Term Loans Amortized Cost Basis 327 1,560
Total 168,304 175,011
Commercial | Agricultural | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 79
2019 0 13
2018 0 299
2017 0 0
2016 and Prior 0 6
Lines of Credit (“LOC”) Amortized Cost Basis 0 34
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 431
Commercial | Agricultural | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 191 86
2020 25 101
2019 27 64
2018 53 47
2017 22 12
2016 and Prior 3 10
Lines of Credit (“LOC”) Amortized Cost Basis 23 68
LOC Converted to Term Loans Amortized Cost Basis 69 75
Total 413 463
Commercial | Agricultural | Doubtful and loss    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 0
Commercial | Agricultural | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 32,971 36,214
2020 20,255 19,324
2019 10,280 10,091
2018 3,699 5,017
2017 2,386 1,928
2016 and Prior 462 356
Lines of Credit (“LOC”) Amortized Cost Basis 98,268 101,340
LOC Converted to Term Loans Amortized Cost Basis 396 1,635
Total 168,717 175,905
Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 329,123 535,591
Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 11,958,874 12,826,637
Current | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 352,831 387,187
Current | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 185,792 187,881
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 185,792 187,881
Current | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 97,830 69,334
2020 21,885 44,215
2019 11,712 27,525
2018 6,756 21,995
2017 5,416 19,023
2016 and Prior 3,833 2,530
Lines of Credit (“LOC”) Amortized Cost Basis 19,607 14,684
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 167,039 199,306
Current | Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 9,131,179 9,169,016
Current | Real Estate | Construction and development    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,325,753 1,591,791
Current | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 419,605 473,340
2020 335,788 209,810
2019 185,190 297,308
2018 260,037 235,429
2017 193,110 183,229
2016 and Prior 421,957 236,395
Lines of Credit (“LOC”) Amortized Cost Basis 256,155 196,505
LOC Converted to Term Loans Amortized Cost Basis 9,422 10,592
Total 2,081,264 1,842,608
Current | Real Estate | Other commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,724,162 5,734,617
Current | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,145,744 2,734,935
Current | Commercial | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,977,157 2,559,443
Current | Commercial | Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 168,587 175,492
Current | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 24,247 125
2020 4,740 4,260
2019 1,236 27,256
2018 22,438 6,489
2017 6,692 2,628
2016 and Prior 5,578 6,065
Lines of Credit (“LOC”) Amortized Cost Basis 264,189 488,676
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 329,120 535,499
30-89 days past due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 847 708
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 847 708
30-89 days past due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 265 234
2020 121 441
2019 164 327
2018 49 658
2017 219 689
2016 and Prior 156 84
Lines of Credit (“LOC”) Amortized Cost Basis 175 338
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 1,149 2,771
30-89 days past due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,061 6,300
2020 883 2,258
2019 1,662 2,593
2018 791 2,610
2017 1,077 2,058
2016 and Prior 4,360 6,050
Lines of Credit (“LOC”) Amortized Cost Basis 1,479 1,781
LOC Converted to Term Loans Amortized Cost Basis 0 76
Total 11,313 23,726
30-89 days past due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 59
2020 0 0
2019 0 0
2018 0 0
2017 0 33
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 0 92
90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 32,907 35,188
90+ days past due | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 543 558
90+ days past due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 413 256
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 413 256
90+ days past due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 23 79
2020 23 58
2019 28 25
2018 21 80
2017 13 40
2016 and Prior 22 12
Lines of Credit (“LOC”) Amortized Cost Basis 0 8
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 130 302
90+ days past due | Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 22,170 27,014
90+ days past due | Real Estate | Construction and development    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 504 3,089
90+ days past due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 27 557
2020 561 1,853
2019 507 2,735
2018 1,199 2,582
2017 1,358 832
2016 and Prior 5,104 3,852
Lines of Credit (“LOC”) Amortized Cost Basis 570 1,928
LOC Converted to Term Loans Amortized Cost Basis 72 0
Total 9,398 14,339
90+ days past due | Real Estate | Other commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 12,268 9,586
90+ days past due | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 10,191 7,616
90+ days past due | Commercial | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 10,074 7,429
90+ days past due | Commercial | Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 117 187
90+ days past due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 3 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 3 0
30 + days past due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 187,052 188,845
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 187,052 188,845
30 + days past due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 98,118 69,647
2020 22,029 44,714
2019 11,904 27,877
2018 6,826 22,733
2017 5,648 19,752
2016 and Prior 4,011 2,626
Lines of Credit (“LOC”) Amortized Cost Basis 19,782 15,030
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 168,318 202,379
30 + days past due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 420,693 480,197
2020 337,232 213,921
2019 187,359 302,636
2018 262,027 240,621
2017 195,545 186,119
2016 and Prior 431,421 246,297
Lines of Credit (“LOC”) Amortized Cost Basis 258,204 200,214
LOC Converted to Term Loans Amortized Cost Basis 9,494 10,668
Total 2,101,975 1,880,673
30 + days past due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 24,247 184
2020 4,740 4,260
2019 1,236 27,256
2018 22,438 6,489
2017 6,692 2,661
2016 and Prior 5,581 6,065
Lines of Credit (“LOC”) Amortized Cost Basis 264,189 488,676
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total $ 329,123 $ 535,591