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Loans and Allowance for Credit Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 11,386,352 | $ 12,900,897
Loans other than pass or current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 61,384 | 206,034
2020 | 118,739 | 25,804
2019 | 15,111 | 43,589
2018 | 31,537 | 44,544
2017 | 80,056 | 34,311
2016 and Prior | 64,418 | 32,434
Lines of Credit (“LOC”) Amortized Cost Basis | 222,021 | 214,137
LOC Converted to Term Loans Amortized Cost Basis | 60,010 | 93,154
Total | 653,276 | 694,007
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 359,346 | 391,224
Consumer | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 177,634 | 188,845
Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 181,712 | 202,379
Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 8,368,848 | 9,223,791
Real Estate | Construction and development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,428,165 | 1,596,255
Real Estate | Construction and development | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 0 | 2,728
2020 | 0 | 344
2019 | 292 | 259
2018 | 0 | 2,107
2017 | 1,360 | 19
2016 and Prior | 0 | 0
Lines of Credit (“LOC”) Amortized Cost Basis | 0 | 9,613
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 1,652 | 15,070
Real Estate | Construction and development | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 1,740 | 294
2020 | 42 | 2,069
2019 | 547 | 404
2018 | 401 | 449
2017 | 333 | 342
2016 and Prior | 733 | 320
Lines of Credit (“LOC”) Amortized Cost Basis | 10,513 | 17,914
LOC Converted to Term Loans Amortized Cost Basis | 1,954 | 14
Total | 16,263 | 21,806
Real Estate | Construction and development | Doubtful and loss |  |
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) | 1,740 | 3,022
2020 | 42 | 2,413
2019 | 839 | 663
2018 | 401 | 2,556
2017 | 1,693 | 361
2016 and Prior | 733 | 320
Lines of Credit (“LOC”) Amortized Cost Basis | 10,513 | 27,527
LOC Converted to Term Loans Amortized Cost Basis | 1,954 | 14
Total | 17,915 | 36,876
Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,608,028 | 1,880,673
Real Estate | Other commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 5,332,655 | 5,746,863
Real Estate | Other commercial | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 30,225 | 100,085
2020 | 69,187 | 4,346
2019 | 1,818 | 10,738
2018 | 8,584 | 19,943
2017 | 40,531 | 26,245
2016 and Prior | 34,225 | 10,608
Lines of Credit (“LOC”) Amortized Cost Basis | 127,273 | 63,305
LOC Converted to Term Loans Amortized Cost Basis | 18,393 | 23,435
Total | 330,236 | 258,705
Real Estate | Other commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 25,532 | 66,737
2020 | 25,865 | 9,418
2019 | 6,477 | 24,380
2018 | 15,304 | 14,067
2017 | 33,640 | 3,744
2016 and Prior | 23,723 | 11,158
Lines of Credit (“LOC”) Amortized Cost Basis | 50,734 | 52,182
LOC Converted to Term Loans Amortized Cost Basis | 20,480 | 39,486
Total | 201,755 | 221,172
Real Estate | Other commercial | Doubtful and loss |  |
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 | Other commercial | Risk rate 5, 6, and 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 55,757 | 166,822
2020 | 95,052 | 13,764
2019 | 8,295 | 35,118
2018 | 23,888 | 34,010
2017 | 74,171 | 29,989
2016 and Prior | 57,948 | 21,766
Lines of Credit (“LOC”) Amortized Cost Basis | 178,007 | 115,487
LOC Converted to Term Loans Amortized Cost Basis | 38,873 | 62,921
Total | 531,991 | 479,877
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,268,191 | 2,750,291
Commercial | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,074,729 | 2,574,386
Commercial | Commercial | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 0 | 5,707
2020 | 1,247 | 342
2019 | 354 | 465
2018 | 523 | 972
2017 | 392 | 54
2016 and Prior | 752 | 0
Lines of Credit (“LOC”) Amortized Cost Basis | 5,380 | 12,318
LOC Converted to Term Loans Amortized Cost Basis | 12,438 | 22,546
Total | 21,086 | 42,404
Commercial | Commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 3,627 | 23,227
2020 | 21,024 | 4,495
2019 | 3,616 | 1,586
2018 | 2,035 | 730
2017 | 796 | 276
2016 and Prior | 799 | 334
Lines of Credit (“LOC”) Amortized Cost Basis | 25,859 | 53,682
LOC Converted to Term Loans Amortized Cost Basis | 6,601 | 7,522
Total | 64,357 | 91,852
Commercial | Commercial | Doubtful and loss |  |
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 | Commercial | Risk rate 5, 6, and 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 3,627 | 28,934
2020 | 22,271 | 4,837
2019 | 3,970 | 2,051
2018 | 2,558 | 1,702
2017 | 1,188 | 330
2016 and Prior | 1,551 | 334
Lines of Credit (“LOC”) Amortized Cost Basis | 31,239 | 66,000
LOC Converted to Term Loans Amortized Cost Basis | 19,039 | 30,068
Total | 85,443 | 134,256
Commercial | Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 193,462 | 175,905
Commercial | Agricultural | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 0 | 0
2020 | 0 | 79
2019 | 6 | 13
2018 | 10 | 299
2017 | 15 | 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 | 31 | 431
Commercial | Agricultural | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 105 | 86
2020 | 65 | 101
2019 | 121 | 64
2018 | 294 | 47
2017 | 64 | 12
2016 and Prior | 20 | 10
Lines of Credit (“LOC”) Amortized Cost Basis | 229 | 68
LOC Converted to Term Loans Amortized Cost Basis | 72 | 75
Total | 970 | 463
Commercial | Agricultural | Doubtful and loss |  |
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) | 105 | 86
2020 | 65 | 180
2019 | 127 | 77
2018 | 304 | 346
2017 | 79 | 12
2016 and Prior | 20 | 16
Lines of Credit (“LOC”) Amortized Cost Basis | 229 | 102
LOC Converted to Term Loans Amortized Cost Basis | 72 | 75
Total | 1,001 | 894
Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 389,967 | 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 | 644 | 708
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 644 | 708
30-89 days past due | Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 44 | 234
2020 | 193 | 441
2019 | 81 | 327
2018 | 174 | 658
2017 | 178 | 689
2016 and Prior | 208 | 84
Lines of Credit (“LOC”) Amortized Cost Basis | 66 | 339
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 944 | 2,772
30-89 days past due | Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 111 | 6,300
2020 | 1,034 | 2,258
2019 | 540 | 2,593
2018 | 2,033 | 2,610
2017 | 844 | 2,058
2016 and Prior | 1,744 | 6,050
Lines of Credit (“LOC”) Amortized Cost Basis | 505 | 1,782
LOC Converted to Term Loans Amortized Cost Basis | 72 | 76
Total | 6,883 | 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 | 0 |
Lines of Credit (“LOC”) Amortized Cost Basis | 0 |
LOC Converted to Term Loans Amortized Cost Basis | 0 |
Total | 0 |
90 Days or More Past Due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 34,812 | 35,188
90 Days or More Past Due | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 394 | 558
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 | 273 | 256
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 273 | 256
90 Days or More Past Due | Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 0 | 79
2020 | 13 | 58
2019 | 56 | 25
2018 | 2 | 80
2017 | 33 | 40
2016 and Prior | 17 | 12
Lines of Credit (“LOC”) Amortized Cost Basis | 0 | 8
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 121 | 302
90 Days or More Past Due | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 24,898 | 27,014
90 Days or More Past Due | Real Estate | Construction and development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,595 | 3,089
90 Days or More Past Due | Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 0 | 557
2020 | 69 | 1,853
2019 | 1,203 | 2,735
2018 | 2,177 | 2,582
2017 | 1,870 | 832
2016 and Prior | 2,197 | 3,852
Lines of Credit (“LOC”) Amortized Cost Basis | 545 | 1,928
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 8,061 | 14,339
90 Days or More Past Due | Real Estate | Other commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 15,242 | 9,586
90 Days or More Past Due | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 9,520 | 7,616
90 Days or More Past Due | Commercial | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 9,167 | 7,429
90 Days or More Past Due | Commercial | Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 353 | 187
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 | 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 | 917 | 964
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 917 | 964
30 + days past due | Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 44 | 313
2020 | 206 | 499
2019 | 137 | 352
2018 | 176 | 738
2017 | 211 | 729
2016 and Prior | 225 | 96
Lines of Credit (“LOC”) Amortized Cost Basis | 66 | 347
LOC Converted to Term Loans Amortized Cost Basis | 0 | 0
Total | 1,065 | 3,074
30 + days past due | Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 (YTD) | 111 | 6,857
2020 | 1,103 | 4,111
2019 | 1,743 | 5,328
2018 | 4,210 | 5,192
2017 | 2,714 | 2,890
2016 and Prior | 3,941 | 9,902
Lines of Credit (“LOC”) Amortized Cost Basis | 1,050 | 3,710
LOC Converted to Term Loans Amortized Cost Basis | 72 | 76
Total | 14,944 | $ 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 | 0 |
Lines of Credit (“LOC”) Amortized Cost Basis | 0 |
LOC Converted to Term Loans Amortized Cost Basis | 0 |
Total | $ 0 |

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