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Loans and Allowance for Loan Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | $ 3,861 |
2019 | 63,661 |
2018 | 38,126 |
2017 | 33,137 |
2016 | 22,153 |
2015 and Prior | 37,205 |
Lines of Credit Amortized Cost Basis | 138,142 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 1,989 |
Total | 338,274 | $ 14,425,704
Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 14,113,275
Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 102,618
Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 209,421
Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 173
Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 217
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 454,496
Consumer | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 451,829
Consumer | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,667
Consumer | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 1,191 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 1,191 | 204,802
Consumer | Credit cards | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 204,161
Consumer | Credit cards | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Credit cards | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 641
Consumer | Credit cards | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Credit cards | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 47 |
2019 | 1,256 |
2018 | 733 |
2017 | 1,634 |
2016 | 1,385 |
2015 and Prior | 311 |
Lines of Credit Amortized Cost Basis | 306 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 5,672 | 249,694
Consumer | Other consumer | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 247,668
Consumer | Other consumer | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Other consumer | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,026
Consumer | Other consumer | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Consumer | Other consumer | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 10,884,524
Real Estate | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 10,691,728
Real Estate | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 75,864
Real Estate | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 116,765
Real Estate | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 130
Real Estate | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 37
Real Estate | Construction and development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 3,614 |
2018 | 639 |
2017 | 2,163 |
2016 | 453 |
2015 and Prior | 626 |
Lines of Credit Amortized Cost Basis | 2,401 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 209 |
Total | 10,105 | 2,236,861
Real Estate | Construction and development | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,229,019
Real Estate | Construction and development | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 45 |
2018 | 19 |
2017 | 1,957 |
2016 | 21 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 0 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 2,042 | 70
Real Estate | Construction and development | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 3,569 |
2018 | 620 |
2017 | 206 |
2016 | 432 |
2015 and Prior | 626 |
Lines of Credit Amortized Cost Basis | 2,401 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 209 |
Total | 8,063 | 7,735
Real Estate | Construction and development | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 0 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 0 | 0
Real Estate | Construction and development | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 37
Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 33 |
2019 | 6,787 |
2018 | 10,242 |
2017 | 7,042 |
2016 | 6,839 |
2015 and Prior | 11,981 |
Lines of Credit Amortized Cost Basis | 3,557 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 46,481 | 2,442,064
Real Estate | Single family residential | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,394,284
Real Estate | Single family residential | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 6,049
Real Estate | Single family residential | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 41,601
Real Estate | Single family residential | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 130
Real Estate | Single family residential | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Real Estate | Other commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 3,765 |
2019 | 39,688 |
2018 | 19,327 |
2017 | 5,354 |
2016 | 11,705 |
2015 and Prior | 23,438 |
Lines of Credit Amortized Cost Basis | 50,029 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 1,037 |
Total | 154,343 | 6,205,599
Real Estate | Other commercial | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 6,068,425
Real Estate | Other commercial | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 1,037 |
2019 | 23,628 |
2018 | 2,116 |
2017 | 985 |
2016 | 4,845 |
2015 and Prior | 3,379 |
Lines of Credit Amortized Cost Basis | 12,477 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 48,467 | 69,745
Real Estate | Other commercial | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 2,728 |
2019 | 16,060 |
2018 | 17,211 |
2017 | 4,369 |
2016 | 6,860 |
2015 and Prior | 20,059 |
Lines of Credit Amortized Cost Basis | 37,552 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 1,037 |
Total | 105,876 | 67,429
Real Estate | Other commercial | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 0 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 0 | 0
Real Estate | Other commercial | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,810,970
Commercial | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,694,004
Commercial | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 26,754
Commercial | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 89,989
Commercial | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 43
Commercial | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 180
Commercial | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 16 |
2019 | 12,134 |
2018 | 7,008 |
2017 | 16,750 |
2016 | 1,671 |
2015 and Prior | 841 |
Lines of Credit Amortized Cost Basis | 80,411 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 743 |
Total | 119,574 | 2,495,516
Commercial | Commercial | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,384,263
Commercial | Commercial | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 209 |
2018 | 14 |
2017 | 270 |
2016 | 407 |
2015 and Prior | 77 |
Lines of Credit Amortized Cost Basis | 25,418 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 26,395 | 26,713
Commercial | Commercial | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 16 |
2019 | 11,925 |
2018 | 6,994 |
2017 | 16,480 |
2016 | 1,264 |
2015 and Prior | 764 |
Lines of Credit Amortized Cost Basis | 54,993 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 743 |
Total | 93,179 | 84,317
Commercial | Commercial | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 0 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 0 | 43
Commercial | Commercial | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 180
Commercial | Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 182 |
2018 | 177 |
2017 | 194 |
2016 | 100 |
2015 and Prior | 8 |
Lines of Credit Amortized Cost Basis | 247 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 908 | 315,454
Commercial | Agricultural | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 309,741
Commercial | Agricultural | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 67 |
2018 | 0 |
2017 | 25 |
2016 | 12 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 17 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 121 | 41
Commercial | Agricultural | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 115 |
2018 | 177 |
2017 | 169 |
2016 | 88 |
2015 and Prior | 8 |
Lines of Credit Amortized Cost Basis | 230 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 787 | 5,672
Commercial | Agricultural | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 0 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 0 | 0
Commercial | Agricultural | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 275,714
Other | Risk rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 275,714
Other | Risk rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Other | Risk rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Other | Risk rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 0
Other | Risk rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | $ 0
30-89 days past due | Consumer | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 866 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 866 |
30-89 days past due | Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 47 |
2019 | 1,109 |
2018 | 636 |
2017 | 1,188 |
2016 | 1,182 |
2015 and Prior | 251 |
Lines of Credit Amortized Cost Basis | 128 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 4,541 |
30-89 days past due | Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 33 |
2019 | 4,672 |
2018 | 6,168 |
2017 | 4,648 |
2016 | 5,010 |
2015 and Prior | 8,233 |
Lines of Credit Amortized Cost Basis | 2,471 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 31,235 |
90 Days or More Past Due | Consumer | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
2015 and Prior | 0 |
Lines of Credit Amortized Cost Basis | 325 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 325 |
90 Days or More Past Due | Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 147 |
2018 | 97 |
2017 | 446 |
2016 | 203 |
2015 and Prior | 60 |
Lines of Credit Amortized Cost Basis | 178 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | 1,131 |
90 Days or More Past Due | Real Estate | Single family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 (YTD) | 0 |
2019 | 2,115 |
2018 | 4,074 |
2017 | 2,394 |
2016 | 1,829 |
2015 and Prior | 3,748 |
Lines of Credit Amortized Cost Basis | 1,086 |
Lines of Credit Converted to Term Loans Amortized Cost Basis | 0 |
Total | $ 15,246 |

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