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Loans and Allowance for Credit Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 12,195,873 $ 12,900,897
Loans other than pass or current    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 75,466 206,034
2020 252,462 25,804
2019 12,624 43,589
2018 12,674 44,544
2017 23,815 34,311
2016 and Prior 55,379 32,434
Lines of Credit (“LOC”) Amortized Cost Basis 239,565 214,137
LOC Converted to Term Loans Amortized Cost Basis 68,060 93,154
Total 740,045 694,007
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 348,423 391,224
Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 175,458 188,845
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 172,965 202,379
Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 8,819,907 9,223,791
Real Estate | Construction and development    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,451,841 1,596,255
Real Estate | Construction and development | 5 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 2,728
2020 2,664 344
2019 1,699 259
2018 0 2,107
2017 0 19
2016 and Prior 16 0
Lines of Credit (“LOC”) Amortized Cost Basis 13,042 9,613
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 17,421 15,070
Real Estate | Construction and development | 6 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 93 294
2020 2,449 2,069
2019 580 404
2018 387 449
2017 244 342
2016 and Prior 460 320
Lines of Credit (“LOC”) Amortized Cost Basis 8,386 17,914
LOC Converted to Term Loans Amortized Cost Basis 1,955 14
Total 14,554 21,806
Real Estate | Construction and development | 7 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 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 (YTD) 93 3,022
2020 5,113 2,413
2019 2,279 663
2018 387 2,556
2017 244 361
2016 and Prior 476 320
Lines of Credit (“LOC”) Amortized Cost Basis 21,428 27,527
LOC Converted to Term Loans Amortized Cost Basis 1,955 14
Total 31,975 36,876
Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,730,056 1,880,673
Real Estate | Other commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,638,010 5,746,863
Real Estate | Other commercial | 5 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 66,468 100,085
2020 121,611 4,346
2019 1,463 10,738
2018 965 19,943
2017 13,348 26,245
2016 and Prior 32,957 10,608
Lines of Credit (“LOC”) Amortized Cost Basis 89,957 63,305
LOC Converted to Term Loans Amortized Cost Basis 7,293 23,435
Total 334,062 258,705
Real Estate | Other commercial | 6 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 5,944 66,737
2020 93,796 9,418
2019 3,256 24,380
2018 3,686 14,067
2017 5,059 3,744
2016 and Prior 9,707 11,158
Lines of Credit (“LOC”) Amortized Cost Basis 59,872 52,182
LOC Converted to Term Loans Amortized Cost Basis 32,859 39,486
Total 214,179 221,172
Real Estate | Other commercial | 7 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 0
2020 0 0
2019 0 0
2018 0 0
2017 1 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 1 0
Total 2 0
Real Estate | Other commercial | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 72,412 166,822
2020 215,407 13,764
2019 4,719 35,118
2018 4,651 34,010
2017 18,408 29,989
2016 and Prior 42,664 21,766
Lines of Credit (“LOC”) Amortized Cost Basis 149,829 115,487
LOC Converted to Term Loans Amortized Cost Basis 40,153 62,921
Total 548,243 479,877
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,600,621 2,750,291
Commercial | Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,444,700 2,574,386
Commercial | Commercial | 5 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 124 5,707
2020 3,274 342
2019 202 465
2018 67 972
2017 8 54
2016 and Prior 29 0
Lines of Credit (“LOC”) Amortized Cost Basis 5,883 12,318
LOC Converted to Term Loans Amortized Cost Basis 18,954 22,546
Total 28,541 42,404
Commercial | Commercial | 6 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 2,027 23,227
2020 25,259 4,495
2019 2,763 1,586
2018 1,430 730
2017 539 276
2016 and Prior 535 334
Lines of Credit (“LOC”) Amortized Cost Basis 59,475 53,682
LOC Converted to Term Loans Amortized Cost Basis 6,924 7,522
Total 98,952 91,852
Commercial | Commercial | 7 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 0
2020 3 0
2019 0 0
2018 5 0
2017 2 0
2016 and Prior 0 0
Lines of Credit (“LOC”) Amortized Cost Basis 0 0
LOC Converted to Term Loans Amortized Cost Basis 1 0
Total 11 0
Commercial | Commercial | Risk rate 5, 6, and 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 2,151 28,934
2020 28,536 4,837
2019 2,965 2,051
2018 1,502 1,702
2017 549 330
2016 and Prior 564 334
Lines of Credit (“LOC”) Amortized Cost Basis 65,358 66,000
LOC Converted to Term Loans Amortized Cost Basis 25,879 30,068
Total 127,504 134,256
Commercial | Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 155,921 175,905
Commercial | Agricultural | 5 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 35 0
2020 0 79
2019 6 13
2018 12 299
2017 17 0
2016 and Prior 0 6
Lines of Credit (“LOC”) Amortized Cost Basis 63 34
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 133 431
Commercial | Agricultural | 6 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 58 86
2020 57 101
2019 79 64
2018 279 47
2017 68 12
2016 and Prior 17 10
Lines of Credit (“LOC”) Amortized Cost Basis 105 68
LOC Converted to Term Loans Amortized Cost Basis 73 75
Total 736 463
Commercial | Agricultural | 7 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 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 (YTD) 93 86
2020 57 180
2019 85 77
2018 291 346
2017 85 12
2016 and Prior 17 16
Lines of Credit (“LOC”) Amortized Cost Basis 168 102
LOC Converted to Term Loans Amortized Cost Basis 73 75
Total 869 894
Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 426,922 535,591
30-89 days past due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 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 786 708
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 786 708
30-89 days past due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 234
2020 258 441
2019 142 327
2018 78 658
2017 237 689
2016 and Prior 421 84
Lines of Credit (“LOC”) Amortized Cost Basis 85 339
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 1,221 2,772
30-89 days past due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 717 6,300
2020 1,906 2,258
2019 1,730 2,593
2018 3,660 2,610
2017 2,229 2,058
2016 and Prior 6,766 6,050
Lines of Credit (“LOC”) Amortized Cost Basis 828 1,782
LOC Converted to Term Loans Amortized Cost Basis 0 76
Total 17,836 23,727
30-89 days past due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0  
2020 0  
2019 0  
2018 0  
2017 0  
2016 and Prior 23  
Lines of Credit (“LOC”) Amortized Cost Basis 0  
LOC Converted to Term Loans Amortized Cost Basis 0  
Total 23  
90 Days or More Past Due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 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 453 256
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 453 256
90 Days or More Past Due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 79
2020 19 58
2019 76 25
2018 36 80
2017 57 40
2016 and Prior 137 12
Lines of Credit (“LOC”) Amortized Cost Basis 4 8
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 329 302
90 Days or More Past Due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 557
2020 1,166 1,853
2019 628 2,735
2018 2,069 2,582
2017 2,006 832
2016 and Prior 4,311 3,852
Lines of Credit (“LOC”) Amortized Cost Basis 626 1,928
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 10,806 14,339
90 Days or More Past Due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0  
2020 0  
2019 0  
2018 0  
2017 0  
2016 and Prior 0  
Lines of Credit (“LOC”) Amortized Cost Basis 0  
LOC Converted to Term Loans Amortized Cost Basis 0  
Total 0  
30 + days past due | Consumer | Credit cards    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 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 1,239 964
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 1,239 964
30 + days past due | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0 313
2020 277 499
2019 218 352
2018 114 738
2017 294 729
2016 and Prior 558 96
Lines of Credit (“LOC”) Amortized Cost Basis 89 347
LOC Converted to Term Loans Amortized Cost Basis 0 0
Total 1,550 3,074
30 + days past due | Real Estate | Single family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 717 6,857
2020 3,072 4,111
2019 2,358 5,328
2018 5,729 5,192
2017 4,235 2,890
2016 and Prior 11,077 9,902
Lines of Credit (“LOC”) Amortized Cost Basis 1,454 3,710
LOC Converted to Term Loans Amortized Cost Basis 0 76
Total 28,642 $ 38,066
30 + days past due | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 (YTD) 0  
2020 0  
2019 0  
2018 0  
2017 0  
2016 and Prior 23  
Lines of Credit (“LOC”) Amortized Cost Basis 0  
LOC Converted to Term Loans Amortized Cost Basis 0  
Total $ 23