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Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 1,938,172 $ 8,709,446
2020 8,662,165 6,259,069
2019 6,137,080 4,981,643
2018 4,754,291 3,875,295
2017 3,473,786 2,594,349
Prior 6,709,361 4,699,763
Total loans 38,805,101 38,252,984
Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,312,081 5,241,473
2020 4,607,669 2,722,640
2019 2,661,977 2,098,769
2018 1,987,403 1,662,981
2017 1,516,464 1,130,716
Prior 2,919,255 2,015,220
Total loans 19,693,834 19,520,168
Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 359,585 1,344,249
2020 1,460,175 2,469,117
2019 2,502,712 2,366,966
2018 2,320,191 1,431,516
2017 1,268,752 696,471
Prior 2,188,362 1,649,986
Total loans 10,533,928 10,325,707
Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 266,506 2,123,724
2020 2,594,321 1,067,312
2019 972,391 515,908
2018 446,697 780,798
2017 688,570 767,162
Prior 1,601,744 1,034,557
Total loans $ 8,577,339 8,407,109
Maximum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percent of loan amount 50.00%  
Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 1,061,345 3,911,053
2020 3,291,648 1,414,417
2019 1,353,825 904,651
2018 823,114 640,754
2017 599,512 565,886
Prior 1,227,807 674,588
Total loans 12,662,329 12,410,152
Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 250,736 1,330,420
2020 1,316,021 1,308,223
2019 1,308,152 1,194,118
2018 1,164,289 1,022,227
2017 916,952 564,830
Prior 1,691,448 1,340,632
Total loans 7,031,505 7,110,016
Home equity lines | Retail    
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 1,432,367 1,537,726
Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 267,396 1,057,929
2020 1,191,762 2,197,597
2019 2,286,419 2,200,615
2018 2,167,328 1,247,704
2017 1,104,888 644,017
Prior 1,985,182 1,470,998
Total loans 9,335,725 9,103,379
1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 68,560 199,249
2020 181,692 95,798
2019 80,075 75,087
2018 66,168 89,704
2017 79,763 40,069
Prior 120,313 99,791
Total loans 638,954 628,695
Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 23,629 87,071
2020 86,721 175,722
2019 136,218 91,264
2018 86,695 94,108
2017 84,101 12,385
Prior 82,867 79,197
Total loans 559,249 593,633
Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 258,880 1,871,545
2020 1,796,774 875,730
2019 800,320 426,459
2018 370,292 679,144
2017 596,887 686,676
Prior 1,475,010 972,897
Total loans 5,299,175 5,513,491
Credit cards | Retail    
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 267,371 281,018
Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,626 252,179
2020 797,547 191,582
2019 172,071 89,449
2018 76,405 101,654
2017 91,683 80,486
Prior 126,734 61,660
Total loans 1,578,426 1,074,874
Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,059,766 3,819,048
2020 3,169,156 1,333,460
2019 1,277,288 847,283
2018 784,112 582,612
2017 557,454 551,413
Prior 1,181,305 633,871
Total loans 12,147,516 11,920,200
Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 250,215 1,321,680
2020 1,306,635 1,275,435
2019 1,271,373 1,131,183
2018 1,089,766 982,056
2017 880,566 555,932
Prior 1,640,599 1,297,070
Total loans 6,823,061 6,912,922
Pass | Home equity lines | Retail    
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 1,415,234 1,520,587
Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 266,356 1,055,440
2020 1,189,454 2,126,667
2019 2,196,482 1,999,345
2018 1,879,176 1,091,880
2017 917,367 483,780
Prior 1,623,228 1,301,088
Total loans 8,348,616 8,287,244
Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 66,477 197,320
2020 179,602 95,145
2019 79,636 70,267
2018 60,281 88,454
2017 78,564 38,729
Prior 116,823 97,374
Total loans 622,426 614,946
Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 23,510 84,985
2020 84,651 173,302
2019 134,182 83,734
2018 81,260 92,911
2017 83,035 12,249
Prior 79,755 76,380
Total loans 545,411 576,811
Pass | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 258,674 1,871,512
2020 1,796,593 874,769
2019 797,705 425,711
2018 358,353 678,255
2017 585,879 685,810
Prior 1,438,675 965,382
Total loans 5,236,891 5,502,479
Pass | Credit cards | Retail    
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 265,496 279,142
Pass | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,626 252,160
2020 797,532 190,820
2019 169,798 89,187
2018 74,833 100,459
2017 88,716 80,365
Prior 126,009 61,040
Total loans 1,570,610 1,071,668
Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 807 63,307
2020 57,063 40,618
2019 38,581 12,723
2018 7,942 22,070
2017 18,243 1,665
Prior 3,678 5,545
Total loans 221,914 207,158
Special Mention | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 429 6,170
2020 5,603 9,995
2019 10,306 10,682
2018 19,447 14,138
2017 10,200 1,582
Prior 15,568 13,768
Total loans 61,553 56,335
Special Mention | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 1,482
2020 1,321 66,160
2019 81,524 176,794
2018 229,161 136,004
2017 163,844 138,362
Prior 284,980 129,401
Total loans 816,932 703,643
Special Mention | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 271 402
2020 399 0
2019 0 508
2018 366 109
2017 0 786
Prior 894 118
Total loans 1,930 1,923
Special Mention | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 97 857
2020 849 1,995
2019 1,986 2,866
2018 1,455 282
2017 173 0
Prior 383 1,332
Total loans 4,943 7,968
Substandard | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 772 28,698
2020 64,917 36,618
2019 33,901 24,867
2018 11,166 36,072
2017 23,815 12,808
Prior 42,824 35,172
Total loans 268,126 259,247
Substandard | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 92 2,570
2020 3,783 22,793
2019 26,473 42,615
2018 45,438 26,033
2017 26,186 7,316
Prior 35,281 29,794
Total loans 137,253 131,121
Substandard | Home equity lines | Retail    
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 16,139 15,694
Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,040 1,007
2020 987 4,770
2019 8,413 24,476
2018 58,991 19,820
2017 23,677 21,875
Prior 76,974 40,509
Total loans 170,177 112,492
Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 1,812 1,527
2020 1,691 653
2019 439 4,312
2018 5,521 1,141
2017 1,199 554
Prior 2,596 2,299
Total loans 14,598 11,826
Substandard | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 22 1,229
2020 1,221 425
2019 50 4,664
2018 3,980 915
2017 893 136
Prior 2,729 1,485
Total loans 8,895 8,854
Substandard | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 206 33
2020 181 961
2019 2,615 748
2018 11,939 889
2017 11,008 866
Prior 36,034 7,224
Total loans 61,983 10,721
Substandard | Credit cards | Retail    
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 521 595
Substandard | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 19
2020 15 762
2019 2,273 262
2018 1,572 1,195
2017 2,967 121
Prior 691 585
Total loans 7,782 3,171
Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 512 3,721
2019 4,055 19,778
2018 19,894 0
2017 0 0
Prior 0 0
Total loans 24,773 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 9,638 0
2017 0 0
Prior 0 0
Total loans 9,638 9,638
Doubtful | Home equity lines | Retail    
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 19 19
Loss and Charged Off | Home equity lines | Retail    
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 975 1,426
Loss and Charged Off | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 301 291
Total loans 301 291
Loss and Charged Off | Credit cards | Retail    
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 1,354 1,281
Loss and Charged Off | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 34 35
Total loans 34 35
Revolving Loans Amortized Cost Basis    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 6,991,973 6,985,664
Revolving Loans Amortized Cost Basis | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 4,642,550 4,597,604
Revolving Loans Amortized Cost Basis | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 434,151 367,402
Revolving Loans Amortized Cost Basis | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,915,272 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 4,258,643 4,248,038
Revolving Loans Amortized Cost Basis | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 383,907 349,566
Revolving Loans Amortized Cost Basis | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,340,529 1,440,736
Revolving Loans Amortized Cost Basis | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 332,750 284,519
Revolving Loans Amortized Cost Basis | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 42,383 28,997
Revolving Loans Amortized Cost Basis | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 59,018 53,886
Revolving Loans Amortized Cost Basis | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,012 1,040
Revolving Loans Amortized Cost Basis | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 267,371 281,018
Revolving Loans Amortized Cost Basis | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 306,360 297,864
Revolving Loans Amortized Cost Basis | Pass | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 4,072,579 4,102,751
Revolving Loans Amortized Cost Basis | Pass | Owner-occupied | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 383,907 349,566
Revolving Loans Amortized Cost Basis | Pass | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,329,980 1,429,755
Revolving Loans Amortized Cost Basis | Pass | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 276,553 229,044
Revolving Loans Amortized Cost Basis | Pass | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 41,043 27,657
Revolving Loans Amortized Cost Basis | Pass | Land and development | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 59,018 53,250
Revolving Loans Amortized Cost Basis | Pass | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,012 1,040
Revolving Loans Amortized Cost Basis | Pass | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 265,496 279,142
Revolving Loans Amortized Cost Basis | Pass | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 306,096 297,637
Revolving Loans Amortized Cost Basis | Special Mention | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 95,135 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 56,102 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 90,617 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 | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 9,717 9,698
Revolving Loans Amortized Cost Basis | Substandard | Investment properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 95 35
Revolving Loans Amortized Cost Basis | Substandard | 1-4 family properties | Total commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,340 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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Substandard | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 521 595
Revolving Loans Amortized Cost Basis | Substandard | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 264 227
Revolving Loans Amortized Cost Basis | Doubtful | Commercial, financial and agricultural | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 312 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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 832 1,283
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 1,354 1,281
Revolving Loans Amortized Cost Basis | Loss and Charged Off | Other consumer loans | Retail    
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 138,273 147,755
Revolving Loans Converted to Term Loans | Total commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 46,435 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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 91,838 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 46,435 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 | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 91,838 96,990
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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Other consumer loans | Retail    
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 45,856 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 | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 85,254 90,832
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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Pass | Other consumer loans | Retail    
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 465 489
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 114 514
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 | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 6,422 5,996
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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Substandard | Other consumer loans | Retail    
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 | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 19 19
Revolving Loans Converted to Term Loans | Loss and Charged Off | Home equity lines | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 143 143
Revolving Loans Converted to Term Loans | Loss and Charged Off | Consumer mortgages | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss and Charged Off | Credit cards | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans 0 0
Revolving Loans Converted to Term Loans | Loss and Charged Off | Other consumer loans | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 0 $ 0