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Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 $ 1,572,779 $ 9,402,827
2021 9,387,126 6,558,797
2020 6,374,738 4,899,572
2019 4,388,171 3,085,986
2018 2,945,378 2,559,570
Prior 6,759,644 4,742,507
Total loans 40,169,150 39,311,958
Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 710,848 4,200,393
2021 4,023,487 2,696,735
2020 2,621,014 2,112,628
2019 1,991,683 1,549,445
2018 1,507,987 1,184,980
Prior 3,064,111 2,122,625
Total loans 20,352,325 19,622,924
Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 603,897 3,271,317
2021 3,389,426 1,591,162
2020 1,624,780 2,079,334
2019 1,764,102 1,256,576
2018 1,183,077 888,314
Prior 2,180,451 1,494,335
Total loans 11,145,318 11,015,111
Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 258,034 1,931,117
2021 1,974,213 2,270,900
2020 2,128,944 707,610
2019 632,386 279,965
2018 254,314 486,276
Prior 1,515,082 1,125,547
Total loans $ 8,671,507 $ 8,673,923
Maximum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percent of loan amount 50.00% 50.00%
Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 $ 310,234 $ 2,416,022
2021 2,262,796 1,398,694
2020 1,336,778 981,693
2019 933,356 637,246
2018 628,637 451,760
Prior 1,329,880 944,049
Total loans 12,659,611 12,147,858
Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 400,614 1,784,371
2021 1,760,691 1,298,041
2020 1,284,236 1,130,935
2019 1,058,327 912,199
2018 879,350 733,220
Prior 1,734,231 1,178,576
Total loans 7,692,714 7,475,066
Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 503,345 2,831,606
2021 3,003,002 1,463,829
2020 1,515,834 1,946,374
2019 1,649,908 1,140,792
2018 1,085,256 800,794
Prior 1,983,759 1,385,671
Total loans 10,047,145 9,902,776
1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 75,669 297,273
2021 247,765 83,183
2020 70,686 53,146
2019 44,327 47,247
2018 40,543 49,546
Prior 94,040 59,441
Total loans 620,674 645,469
Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 24,883 142,438
2021 138,659 44,150
2020 38,260 79,814
2019 69,867 68,537
2018 57,278 37,974
Prior 102,652 49,223
Total loans 477,499 466,866
Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 227,057 1,276,030
2021 1,267,597 1,560,413
2020 1,499,865 578,415
2019 526,344 228,664
2018 206,756 398,209
Prior 1,324,078 1,027,012
Total loans 5,052,003 5,068,998
Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 1,416,341 1,361,419
Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 188,247 204,172
Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 30,977 655,087
2021 706,616 710,487
2020 629,079 129,195
2019 106,042 51,301
2018 47,558 88,067
Prior 191,004 98,535
Total loans 2,014,916 2,039,334
Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 307,165 2,396,717
2021 2,248,128 1,332,549
2020 1,274,145 922,396
2019 877,338 607,918
2018 605,200 433,045
Prior 1,280,187 903,995
Total loans 12,298,363 11,791,410
Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 400,161 1,776,086
2021 1,752,472 1,276,797
2020 1,199,572 1,117,825
2019 1,044,709 858,721
2018 822,093 708,942
Prior 1,659,184 1,116,766
Total loans 7,453,456 7,292,861
Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 502,093 2,823,978
2021 2,995,934 1,463,503
2020 1,514,881 1,905,534
2019 1,611,876 1,019,765
2018 997,818 738,036
Prior 1,872,911 1,317,634
Total loans 9,746,663 9,547,147
Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 73,676 295,082
2021 245,278 82,976
2020 70,143 51,939
2019 43,125 43,025
2018 38,539 49,057
Prior 91,502 57,025
Total loans 609,862 634,692
Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 24,697 141,614
2021 138,267 42,201
2020 37,147 77,868
2019 69,216 34,058
2018 23,133 37,167
Prior 97,030 44,989
Total loans 435,390 422,627
Pass | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 227,036 1,274,999
2021 1,265,235 1,556,733
2020 1,494,751 572,467
2019 519,494 216,277
2018 195,449 392,492
Prior 1,293,538 1,001,771
Total loans 4,995,809 5,014,994
Pass | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 1,403,508 1,346,191
Pass | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 187,035 203,161
Pass | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 30,863 654,419
2021 705,823 708,937
2020 627,569 127,131
2019 104,053 49,993
2018 46,362 86,175
Prior 189,427 97,765
Total loans 2,007,553 2,030,920
Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 202 2,731
2021 2,235 15,166
2020 14,635 17,571
2019 9,784 10,433
2018 8,486 2,242
Prior 4,156 2,489
Total loans 127,083 122,628
Special Mention | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 138 702
2021 691 19,950
2020 83,388 4,724
2019 5,089 10,202
2018 19,983 18,109
Prior 46,836 36,481
Total loans 156,125 90,168
Special Mention | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 6,163
2021 6,545 0
2020 0 32,290
2019 32,606 63,900
2018 30,827 59,194
Prior 87,595 44,532
Total loans 191,131 239,738
Special Mention | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 243 192
2021 190 207
2020 537 641
2019 638 0
2018 0 0
Prior 235 239
Total loans 1,843 1,279
Special Mention | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 800
2020 790 1,900
2019 0 31,458
2018 31,160 0
Prior 1,160 1,179
Total loans 33,110 35,337
Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 2,867 16,105
2021 11,969 50,979
2020 47,998 40,125
2019 46,234 10,383
2018 11,331 16,473
Prior 45,537 37,565
Total loans 229,844 223,105
Substandard | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 315 7,312
2021 7,269 1,294
2020 1,276 8,386
2019 8,529 43,276
2018 37,274 6,169
Prior 28,211 25,329
Total loans 82,874 91,766
Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 1,252 1,465
2021 523 326
2020 953 8,550
2019 5,426 57,127
2018 56,611 3,564
Prior 23,253 23,505
Total loans 109,351 115,891
Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 1,750 1,999
2021 2,297 0
2020 6 566
2019 564 4,222
2018 2,004 489
Prior 2,303 2,177
Total loans 8,969 9,498
Substandard | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 186 824
2021 392 1,149
2020 323 46
2019 651 3,021
2018 2,985 807
Prior 4,462 3,055
Total loans 8,999 8,902
Substandard | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 21 1,031
2021 2,362 3,680
2020 5,114 5,943
2019 6,846 12,387
2018 11,307 5,717
Prior 29,778 25,025
Total loans 55,428 53,783
Substandard | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 12,268 14,430
Substandard | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 451 348
Substandard | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 114 668
2021 793 1,550
2020 1,510 2,064
2019 1,989 1,308
2018 1,196 1,892
Prior 1,559 750
Total loans 7,345 8,394
Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 469
2021 464 0
2020 0 1,601
2019 0 8,512
2018 3,620 0
Prior 0 0
Total loans 4,132 10,630
Doubtful | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0  
2021 0  
2020 0  
2019 0  
2018 0  
Prior 0  
Total loans 0  
Loss | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 189 85
Loss | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 271
2021 259 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 259 271
Loss | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 5
2019 4 0
2018 0 0
Prior 762 216
Total loans 766 221
Loss | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 565 798
Loss | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total loans 761 663
Loss | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 18 20
Total loans 18 20
Revolving Loans Amortized Cost Basis    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 8,490,526 7,867,710
Revolving Loans Amortized Cost Basis | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 6,399,020 5,713,276
Revolving Loans Amortized Cost Basis | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 399,585 434,073
Revolving Loans Amortized Cost Basis | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,691,921 1,720,361
Revolving Loans Amortized Cost Basis | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 5,823,755 5,275,552
Revolving Loans Amortized Cost Basis | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 575,265 437,724
Revolving Loans Amortized Cost Basis | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 306,041 333,710
Revolving Loans Amortized Cost Basis | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 47,644 55,633
Revolving Loans Amortized Cost Basis | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 45,900 44,730
Revolving Loans Amortized Cost Basis | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 306 255
Revolving Loans Amortized Cost Basis | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,199,728 1,209,272
Revolving Loans Amortized Cost Basis | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 188,247 204,172
Revolving Loans Amortized Cost Basis | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 303,640 306,662
Revolving Loans Amortized Cost Basis | Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 5,672,387 5,151,981
Revolving Loans Amortized Cost Basis | Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 575,265 437,724
Revolving Loans Amortized Cost Basis | Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 251,150 278,697
Revolving Loans Amortized Cost Basis | Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 47,599 55,588
Revolving Loans Amortized Cost Basis | Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 45,900 44,730
Revolving Loans Amortized Cost Basis | Pass | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 306 255
Revolving Loans Amortized Cost Basis | Pass | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,192,522 1,199,556
Revolving Loans Amortized Cost Basis | Pass | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 187,035 203,161
Revolving Loans Amortized Cost Basis | Pass | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 303,456 306,500
Revolving Loans Amortized Cost Basis | Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 87,585 71,996
Revolving Loans Amortized Cost Basis | Special Mention | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Special Mention | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 33,558 33,659
Revolving Loans Amortized Cost Basis | Special Mention | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Special Mention | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 63,546 51,442
Revolving Loans Amortized Cost Basis | Substandard | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 21,333 21,354
Revolving Loans Amortized Cost Basis | Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 45 45
Revolving Loans Amortized Cost Basis | Substandard | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 6,780 9,058
Revolving Loans Amortized Cost Basis | Substandard | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 451 348
Revolving Loans Amortized Cost Basis | Substandard | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 184 162
Revolving Loans Amortized Cost Basis | Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 48 48
Revolving Loans Amortized Cost Basis | Doubtful | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0  
Revolving Loans Amortized Cost Basis | Loss | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 189 85
Revolving Loans Amortized Cost Basis | Loss | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 426 658
Revolving Loans Amortized Cost Basis | Loss | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 761 663
Revolving Loans Amortized Cost Basis | Loss | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 250,788 194,989
Revolving Loans Converted to Term Loans | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 34,175 42,842
Revolving Loans Converted to Term Loans | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 216,613 152,147
Revolving Loans Converted to Term Loans | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 34,175 42,842
Revolving Loans Converted to Term Loans | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 216,613 152,147
Revolving Loans Converted to Term Loans | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 33,813 42,809
Revolving Loans Converted to Term Loans | Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 210,986 146,635
Revolving Loans Converted to Term Loans | Pass | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Special Mention | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Special Mention | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Special Mention | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Special Mention | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 362 33
Revolving Loans Converted to Term Loans | Substandard | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 5,488 5,372
Revolving Loans Converted to Term Loans | Substandard | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Doubtful | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0  
Revolving Loans Converted to Term Loans | Loss | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss | Consumer mortgages | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss | Home equity | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 139 140
Revolving Loans Converted to Term Loans | Loss | Credit cards | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss | Other consumer loans | Total consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 0 $ 0