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Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 6,726,322 $ 8,709,446
2020 7,040,753 6,259,069
2019 5,375,660 4,981,643
2018 3,536,186 3,875,295
2017 2,879,095 2,594,349
Prior 5,347,237 4,699,763
Total loans 38,341,030 38,252,984
Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,280,690 5,241,473
2020 2,874,917 2,722,640
2019 2,290,587 2,098,769
2018 1,689,166 1,662,981
2017 1,345,799 1,130,716
Prior 2,376,645 2,015,220
Total loans 18,934,788 19,520,168
Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,907,264 1,344,249
2020 1,699,369 2,469,117
2019 2,278,244 2,366,966
2018 1,516,817 1,431,516
2017 996,078 696,471
Prior 1,729,457 1,649,986
Total loans 10,540,260 10,325,707
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,538,368 2,123,724
2020 2,466,467 1,067,312
2019 806,829 515,908
2018 330,203 780,798
2017 537,218 767,162
Prior 1,241,135 1,034,557
Total loans $ 8,865,982 $ 8,407,109
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]    
2021 $ 2,154,096 $ 3,911,053
2020 1,567,918 1,414,417
2019 1,090,561 904,651
2018 719,900 640,754
2017 519,664 565,886
Prior 1,061,013 674,588
Total loans 11,771,037 12,410,152
Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,126,594 1,330,420
2020 1,306,999 1,308,223
2019 1,200,026 1,194,118
2018 969,266 1,022,227
2017 826,135 564,830
Prior 1,315,632 1,340,632
Total loans 7,163,751 7,110,016
Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,598,929 1,057,929
2020 1,537,492 2,197,597
2019 2,114,211 2,200,615
2018 1,390,831 1,247,704
2017 873,561 644,017
Prior 1,589,559 1,470,998
Total loans 9,448,463 9,103,379
1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 227,995 199,249
2020 109,255 95,798
2019 56,859 75,087
2018 55,129 89,704
2017 60,136 40,069
Prior 71,483 99,791
Total loans 613,874 628,695
Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 80,340 87,071
2020 52,622 175,722
2019 107,174 91,264
2018 70,857 94,108
2017 62,381 12,385
Prior 68,415 79,197
Total loans 477,923 593,633
Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 938,759 1,871,545
2020 1,664,403 875,730
2019 651,368 426,459
2018 270,374 679,144
2017 451,378 686,676
Prior 1,131,562 972,897
Total loans 5,108,499 5,513,491
Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 1,308,254 1,537,726
Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 293,026 281,018
Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 599,609 252,179
2020 802,064 191,582
2019 155,461 89,449
2018 59,829 101,654
2017 85,840 80,486
Prior 109,573 61,660
Total loans 2,156,203 1,074,874
Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 2,138,319 3,819,048
2020 1,487,509 1,333,460
2019 1,029,770 847,283
2018 688,243 582,612
2017 495,111 551,413
Prior 1,022,111 633,871
Total loans 11,361,216 11,920,200
Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,124,258 1,321,680
2020 1,302,576 1,275,435
2019 1,169,910 1,131,183
2018 898,921 982,056
2017 793,353 555,932
Prior 1,265,310 1,297,070
Total loans 6,973,427 6,912,922
Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,591,349 1,055,440
2020 1,536,934 2,126,667
2019 2,046,139 1,999,345
2018 1,217,911 1,091,880
2017 782,607 483,780
Prior 1,466,183 1,301,088
Total loans 8,930,277 8,287,244
Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 226,200 197,320
2020 109,045 95,145
2019 56,027 70,267
2018 50,133 88,454
2017 59,219 38,729
Prior 68,597 97,374
Total loans 601,725 614,946
Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 80,340 84,985
2020 50,844 173,302
2019 105,188 83,734
2018 66,822 92,911
2017 61,539 12,249
Prior 64,609 76,380
Total loans 465,476 576,811
Pass | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 938,232 1,871,512
2020 1,660,740 874,769
2019 646,572 425,711
2018 257,873 678,255
2017 445,631 685,810
Prior 1,104,999 965,382
Total loans 5,054,702 5,502,479
Pass | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 1,292,514 1,520,587
Pass | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 291,744 279,142
Pass | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 599,241 252,160
2020 801,239 190,820
2019 153,525 89,187
2018 58,391 100,459
2017 83,428 80,365
Prior 108,650 61,040
Total loans 2,148,125 1,071,668
Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 3,019 63,307
2020 22,126 40,618
2019 14,454 12,723
2018 7,994 22,070
2017 3,416 1,665
Prior 2,118 5,545
Total loans 138,675 207,158
Special Mention | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 647 6,170
2020 1,646 9,995
2019 10,783 10,682
2018 12,780 14,138
2017 6,693 1,582
Prior 23,689 13,768
Total loans 56,238 56,335
Special Mention | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,127 1,482
2020 228 66,160
2019 59,292 176,794
2018 124,165 136,004
2017 77,438 138,362
Prior 95,525 129,401
Total loans 417,410 703,643
Special Mention | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 195 402
2020 210 0
2019 0 508
2018 0 109
2017 0 786
Prior 243 118
Total loans 648 1,923
Special Mention | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 857
2020 815 1,995
2019 1,926 2,866
2018 839 282
2017 17 0
Prior 343 1,332
Total loans 3,940 7,968
Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 12,311 28,698
2020 58,283 36,618
2019 43,888 24,867
2018 10,648 36,072
2017 21,137 12,808
Prior 36,784 35,172
Total loans 255,223 259,247
Substandard | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,689 2,570
2020 2,777 22,793
2019 19,333 42,615
2018 51,223 26,033
2017 26,089 7,316
Prior 26,633 29,794
Total loans 127,744 131,121
Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,453 1,007
2020 330 4,770
2019 8,780 24,476
2018 48,755 19,820
2017 13,516 21,875
Prior 27,851 40,509
Total loans 100,776 112,492
Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,600 1,527
2020 0 653
2019 832 4,312
2018 4,996 1,141
2017 917 554
Prior 2,643 2,299
Total loans 11,501 11,826
Substandard | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1,229
2020 963 425
2019 60 4,664
2018 3,196 915
2017 825 136
Prior 3,463 1,485
Total loans 8,507 8,854
Substandard | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 527 33
2020 3,663 961
2019 4,796 748
2018 12,501 889
2017 5,747 866
Prior 26,342 7,224
Total loans 53,576 10,721
Substandard | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 14,592 15,694
Substandard | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 469 595
Substandard | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 368 19
2020 825 762
2019 1,936 262
2018 1,438 1,195
2017 2,412 121
Prior 901 585
Total loans 8,056 3,171
Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 447 0
2020 0 3,721
2019 2,449 19,778
2018 13,015 0
2017 0 0
Prior 0 0
Total loans 15,923 23,547
Doubtful | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 9,638
2018 6,342 0
2017 0 0
Prior 0 0
Total loans 6,342 9,638
Doubtful | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 18 19
Loss and Charged Off | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 221 291
Total loans 221 291
Loss and Charged Off | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 1,130 1,426
Loss and Charged Off | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 0
Total loans 813 1,281
Loss and Charged Off | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 22 35
Total loans 22 35
Revolving Loans Amortized Cost Basis    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 7,314,068 6,985,664
Revolving Loans Amortized Cost Basis | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 5,031,513 4,597,604
Revolving Loans Amortized Cost Basis | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 413,031 367,402
Revolving Loans Amortized Cost Basis | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,869,524 2,020,658
Revolving Loans Amortized Cost Basis | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 4,612,414 4,248,038
Revolving Loans Amortized Cost Basis | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 419,099 349,566
Revolving Loans Amortized Cost Basis | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 343,880 284,519
Revolving Loans Amortized Cost Basis | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 33,017 28,997
Revolving Loans Amortized Cost Basis | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 36,134 53,886
Revolving Loans Amortized Cost Basis | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 655 1,040
Revolving Loans Amortized Cost Basis | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,232,016 1,440,736
Revolving Loans Amortized Cost Basis | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 293,026 281,018
Revolving Loans Amortized Cost Basis | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 343,827 297,864
Revolving Loans Amortized Cost Basis | Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 4,456,088 4,102,751
Revolving Loans Amortized Cost Basis | Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 419,099 349,566
Revolving Loans Amortized Cost Basis | Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 289,154 229,044
Revolving Loans Amortized Cost Basis | Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 32,504 27,657
Revolving Loans Amortized Cost Basis | Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 36,134 53,250
Revolving Loans Amortized Cost Basis | Pass | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 655 1,040
Revolving Loans Amortized Cost Basis | Pass | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,222,184 1,429,755
Revolving Loans Amortized Cost Basis | Pass | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 291,744 279,142
Revolving Loans Amortized Cost Basis | Pass | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 343,651 297,637
Revolving Loans Amortized Cost Basis | Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 85,126 60,741
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 54,635 55,440
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 0 636
Revolving Loans Amortized Cost Basis | Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 71,188 84,498
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 91 35
Revolving Loans Amortized Cost Basis | Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 513 1,340
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 | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 8,843 9,698
Revolving Loans Amortized Cost Basis | Substandard | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 469 595
Revolving Loans Amortized Cost Basis | Substandard | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 176 227
Revolving Loans Amortized Cost Basis | Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 12 48
Revolving Loans Amortized Cost Basis | Doubtful | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Doubtful | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 989 1,283
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 813 1,281
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Other consumer loans | 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 121,709 147,755
Revolving Loans Converted to Term Loans | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 45,471 50,765
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 | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 76,238 96,990
Revolving Loans Converted to Term Loans | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 45,471 50,765
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 | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 76,238 96,990
Revolving Loans Converted to Term Loans | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Other consumer loans | 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 44,065 49,762
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 | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 70,330 90,832
Revolving Loans Converted to Term Loans | Pass | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Other consumer loans | 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 422 489
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 984 514
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 | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 5,749 5,996
Revolving Loans Converted to Term Loans | Substandard | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Other consumer loans | 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 | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Doubtful | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 18 19
Revolving Loans Converted to Term Loans | Loss and Charged Off | Consumer mortgages | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss and Charged Off | Home equity lines | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 141 143
Revolving Loans Converted to Term Loans | Loss and Charged Off | Credit cards | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss and Charged Off | Other consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 0 $ 0