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Loans and Allowance for Loan Losses - Schedule of Loan Portfolio Class by Risk Grade and Origination Year (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year $ 4,462,488   $ 4,462,488   $ 3,516,478
Term loans amortized cost basis by origination, before current fiscal year 3,757,825   3,757,825   3,605,979
Term loans amortized cost basis by origination, two years before current fiscal year 3,260,758   3,260,758   6,748,428
Term loans amortized cost basis by origination, three years before current fiscal year 6,223,525   6,223,525   6,421,195
Term loans amortized cost basis by origination, four years before current fiscal year 5,367,104   5,367,104   3,779,646
Term loans amortized cost basis by origination, prior 9,527,571   9,527,571   7,400,153
Amortized Cost Basis 10,639,305   10,639,305   10,621,961
Converted to Term Loans 514,658   514,658   515,188
Total loans 43,753,234   43,753,234   42,609,028
Gross charge-offs          
Year One     1,464   8,272
Year Two     13,330   20,429
Year Three     8,207   9,696
Year Four     4,010   21,447
Year Five     22,549   4,769
Prior     11,035   29,369
Amortized Cost Basis     20,767   66,860
Converted to Term Loans     168   106
Total 19,969 $ 34,106 81,530 $ 126,965 160,948
Total consumer          
Gross charge-offs          
Total 7,937 $ 6,789 24,091 $ 23,352  
Total commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 2,226,529   2,226,529   1,918,902
Term loans amortized cost basis by origination, before current fiscal year 2,091,726   2,091,726   2,024,538
Term loans amortized cost basis by origination, two years before current fiscal year 1,763,915   1,763,915   2,385,222
Term loans amortized cost basis by origination, three years before current fiscal year 2,224,467   2,224,467   2,480,840
Term loans amortized cost basis by origination, four years before current fiscal year 2,181,369   2,181,369   1,627,809
Term loans amortized cost basis by origination, prior 4,100,601   4,100,601   3,341,160
Amortized Cost Basis 8,538,055   8,538,055   8,470,369
Converted to Term Loans 102,307   102,307   82,289
Total loans 23,228,969   23,228,969   22,331,129
Gross charge-offs          
Year One     673   7,696
Year Two     10,635   16,575
Year Three     4,190   4,329
Year Four     1,543   9,091
Year Five     685   2,564
Prior     5,772   21,971
Amortized Cost Basis     14,730   57,162
Converted to Term Loans     0   0
Total     38,228   119,388
Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,359,041   1,359,041   1,223,336
Term loans amortized cost basis by origination, before current fiscal year 1,311,481   1,311,481   1,034,641
Term loans amortized cost basis by origination, two years before current fiscal year 887,242   887,242   816,396
Term loans amortized cost basis by origination, three years before current fiscal year 747,268   747,268   1,234,324
Term loans amortized cost basis by origination, four years before current fiscal year 1,046,764   1,046,764   671,055
Term loans amortized cost basis by origination, prior 2,064,429   2,064,429   1,642,005
Amortized Cost Basis 7,841,691   7,841,691   7,794,946
Converted to Term Loans 102,307   102,307   82,289
Total loans 15,360,223   15,360,223   14,498,992
Gross charge-offs          
Year One     673   7,696
Year Two     10,635   16,499
Year Three     4,101   3,786
Year Four     1,179   8,787
Year Five     685   997
Prior     2,309   4,413
Amortized Cost Basis     14,730   53,736
Converted to Term Loans     0   0
Total     34,312   95,914
Total commercial and industrial | Owner-occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 867,488   867,488   695,566
Term loans amortized cost basis by origination, before current fiscal year 780,245   780,245   989,897
Term loans amortized cost basis by origination, two years before current fiscal year 876,673   876,673   1,568,826
Term loans amortized cost basis by origination, three years before current fiscal year 1,477,199   1,477,199   1,246,516
Term loans amortized cost basis by origination, four years before current fiscal year 1,134,605   1,134,605   956,754
Term loans amortized cost basis by origination, prior 2,036,172   2,036,172   1,699,155
Amortized Cost Basis 696,364   696,364   675,423
Converted to Term Loans 0   0   0
Total loans 7,868,746   7,868,746   7,832,137
Gross charge-offs          
Year One     0   0
Year Two     0   76
Year Three     89   543
Year Four     364   304
Year Five     0   1,567
Prior     3,463   17,558
Amortized Cost Basis     0   3,426
Converted to Term Loans     0   0
Total     3,916   23,474
Total commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,677,437   1,677,437   989,849
Term loans amortized cost basis by origination, before current fiscal year 1,143,418   1,143,418   815,592
Term loans amortized cost basis by origination, two years before current fiscal year 818,726   818,726   3,566,392
Term loans amortized cost basis by origination, three years before current fiscal year 3,279,500   3,279,500   2,838,854
Term loans amortized cost basis by origination, four years before current fiscal year 2,192,993   2,192,993   934,216
Term loans amortized cost basis by origination, prior 2,971,369   2,971,369   2,587,280
Amortized Cost Basis 186,297   186,297   282,436
Converted to Term Loans 0   0   0
Total loans 12,269,740   12,269,740   12,014,619
Gross charge-offs          
Year One     0   0
Year Two     0   103
Year Three     327   527
Year Four     335   4,752
Year Five     18,544   35
Prior     5   4,767
Amortized Cost Basis     0   0
Converted to Term Loans     0   0
Total     19,211   10,184
Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,491,068   1,491,068   774,358
Term loans amortized cost basis by origination, before current fiscal year 996,888   996,888   646,708
Term loans amortized cost basis by origination, two years before current fiscal year 730,436   730,436   3,414,450
Term loans amortized cost basis by origination, three years before current fiscal year 3,163,584   3,163,584   2,730,301
Term loans amortized cost basis by origination, four years before current fiscal year 2,095,169   2,095,169   899,829
Term loans amortized cost basis by origination, prior 2,847,300   2,847,300   2,488,098
Amortized Cost Basis 137,662   137,662   227,460
Converted to Term Loans 0   0   0
Total loans 11,462,107   11,462,107   11,181,204
Gross charge-offs          
Year One     0   0
Year Two     0   0
Year Three     0   527
Year Four     206   4,752
Year Five     18,544   0
Prior     0   4,602
Amortized Cost Basis     0   0
Converted to Term Loans     0   0
Total     18,750   9,881
Total commercial real estate | 1-4 family properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 142,468   142,468   159,927
Term loans amortized cost basis by origination, before current fiscal year 97,495   97,495   79,934
Term loans amortized cost basis by origination, two years before current fiscal year 58,219   58,219   97,728
Term loans amortized cost basis by origination, three years before current fiscal year 82,717   82,717   82,526
Term loans amortized cost basis by origination, four years before current fiscal year 74,466   74,466   29,301
Term loans amortized cost basis by origination, prior 66,756   66,756   56,324
Amortized Cost Basis 26,206   26,206   40,178
Converted to Term Loans 0   0   0
Total loans 548,327   548,327   545,918
Gross charge-offs          
Year One     0   0
Year Two     0   103
Year Three     110   0
Year Four     129   0
Year Five     0   0
Prior     5   143
Amortized Cost Basis     0   0
Converted to Term Loans     0   0
Total     244   246
Total commercial real estate | Land and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 43,901   43,901   55,564
Term loans amortized cost basis by origination, before current fiscal year 49,035   49,035   88,950
Term loans amortized cost basis by origination, two years before current fiscal year 30,071   30,071   54,214
Term loans amortized cost basis by origination, three years before current fiscal year 33,199   33,199   26,027
Term loans amortized cost basis by origination, four years before current fiscal year 23,358   23,358   5,086
Term loans amortized cost basis by origination, prior 57,313   57,313   42,858
Amortized Cost Basis 22,429   22,429   14,798
Converted to Term Loans 0   0   0
Total loans 259,306   259,306   287,497
Gross charge-offs          
Year One     0   0
Year Two     0   0
Year Three     217   0
Year Four     0   0
Year Five     0   35
Prior     0   22
Amortized Cost Basis     0   0
Converted to Term Loans     0   0
Total     217   57
Total consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 558,522   558,522   607,727
Term loans amortized cost basis by origination, before current fiscal year 522,681   522,681   765,849
Term loans amortized cost basis by origination, two years before current fiscal year 678,117   678,117   796,814
Term loans amortized cost basis by origination, three years before current fiscal year 719,558   719,558   1,101,501
Term loans amortized cost basis by origination, four years before current fiscal year 992,742   992,742   1,217,621
Term loans amortized cost basis by origination, prior 2,455,601   2,455,601   1,471,713
Amortized Cost Basis 1,914,953   1,914,953   1,869,156
Converted to Term Loans 412,351   412,351   432,899
Total loans 8,254,525   8,254,525   8,263,280
Gross charge-offs          
Year One     791   576
Year Two     2,695   3,751
Year Three     3,690   4,840
Year Four     2,132   7,604
Year Five     3,320   2,170
Prior     5,258   2,631
Amortized Cost Basis     6,037   9,698
Converted to Term Loans     168   106
Total     24,091   31,376
Total consumer | Consumer mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 372,212   372,212   457,366
Term loans amortized cost basis by origination, before current fiscal year 423,629   423,629   683,716
Term loans amortized cost basis by origination, two years before current fiscal year 613,290   613,290   676,242
Term loans amortized cost basis by origination, three years before current fiscal year 628,331   628,331   954,512
Term loans amortized cost basis by origination, four years before current fiscal year 881,728   881,728   1,137,528
Term loans amortized cost basis by origination, prior 2,318,493   2,318,493   1,379,387
Amortized Cost Basis 0   0   25
Converted to Term Loans 0   0   0
Total loans 5,237,683   5,237,683   5,288,776
Gross charge-offs          
Year One     0   0
Year Two     0   11
Year Three     4   0
Year Four     153   3
Year Five     254   30
Prior     1,197   122
Amortized Cost Basis     0   0
Converted to Term Loans     0   0
Total     1,608   166
Total consumer | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 1,429,775   1,429,775   1,398,388
Converted to Term Loans 412,351   412,351   432,899
Total loans 1,842,126   1,842,126   1,831,287
Gross charge-offs          
Year One     0   0
Year Two     0   0
Year Three     0   0
Year Four     0   0
Year Five     0   0
Prior     0   0
Amortized Cost Basis     8   230
Converted to Term Loans     168   106
Total     176   336
Total consumer | Credit cards          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 176,367   176,367   185,871
Converted to Term Loans 0   0   0
Total loans 176,367   176,367   185,871
Gross charge-offs          
Year One     0   0
Year Two     0   0
Year Three     0   0
Year Four     0   0
Year Five     0   0
Prior     0   0
Amortized Cost Basis     5,107   7,153
Converted to Term Loans     0   0
Total     5,107   7,153
Total consumer | Other consumer loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 186,310   186,310   150,361
Term loans amortized cost basis by origination, before current fiscal year 99,052   99,052   82,133
Term loans amortized cost basis by origination, two years before current fiscal year 64,827   64,827   120,572
Term loans amortized cost basis by origination, three years before current fiscal year 91,227   91,227   146,989
Term loans amortized cost basis by origination, four years before current fiscal year 111,014   111,014   80,093
Term loans amortized cost basis by origination, prior 137,108   137,108   92,326
Amortized Cost Basis 308,811   308,811   284,872
Converted to Term Loans 0   0   0
Total loans 998,349   998,349   957,346
Gross charge-offs          
Year One     791   576
Year Two     2,695   3,740
Year Three     3,686   4,840
Year Four     1,979   7,601
Year Five     3,066   2,140
Prior     4,061   2,509
Amortized Cost Basis     922   2,315
Converted to Term Loans     0   0
Total     17,200   23,721
Pass | Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,334,232   1,334,232   1,200,861
Term loans amortized cost basis by origination, before current fiscal year 1,230,065   1,230,065   1,001,989
Term loans amortized cost basis by origination, two years before current fiscal year 858,946   858,946   739,134
Term loans amortized cost basis by origination, three years before current fiscal year 687,395   687,395   1,195,316
Term loans amortized cost basis by origination, four years before current fiscal year 1,020,047   1,020,047   629,109
Term loans amortized cost basis by origination, prior 2,013,791   2,013,791   1,586,291
Amortized Cost Basis 7,518,116   7,518,116   7,372,228
Converted to Term Loans 100,721   100,721   81,796
Total loans 14,763,313   14,763,313   13,806,724
Pass | Total commercial and industrial | Owner-occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 863,602   863,602   691,899
Term loans amortized cost basis by origination, before current fiscal year 777,456   777,456   981,593
Term loans amortized cost basis by origination, two years before current fiscal year 855,400   855,400   1,468,946
Term loans amortized cost basis by origination, three years before current fiscal year 1,380,744   1,380,744   1,220,421
Term loans amortized cost basis by origination, four years before current fiscal year 1,086,203   1,086,203   872,744
Term loans amortized cost basis by origination, prior 1,929,582   1,929,582   1,621,387
Amortized Cost Basis 689,783   689,783   619,519
Converted to Term Loans 0   0   0
Total loans 7,582,770   7,582,770   7,476,509
Pass | Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,472,274   1,472,274   769,775
Term loans amortized cost basis by origination, before current fiscal year 991,058   991,058   642,808
Term loans amortized cost basis by origination, two years before current fiscal year 719,592   719,592   3,306,914
Term loans amortized cost basis by origination, three years before current fiscal year 2,940,576   2,940,576   2,406,325
Term loans amortized cost basis by origination, four years before current fiscal year 1,929,505   1,929,505   898,363
Term loans amortized cost basis by origination, prior 2,782,514   2,782,514   2,405,650
Amortized Cost Basis 137,662   137,662   227,460
Converted to Term Loans 0   0   0
Total loans 10,973,181   10,973,181   10,657,295
Pass | Total commercial real estate | 1-4 family properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 141,900   141,900   159,008
Term loans amortized cost basis by origination, before current fiscal year 96,500   96,500   79,094
Term loans amortized cost basis by origination, two years before current fiscal year 57,123   57,123   95,050
Term loans amortized cost basis by origination, three years before current fiscal year 79,910   79,910   81,630
Term loans amortized cost basis by origination, four years before current fiscal year 74,215   74,215   28,845
Term loans amortized cost basis by origination, prior 63,675   63,675   53,167
Amortized Cost Basis 26,206   26,206   40,133
Converted to Term Loans 0   0   0
Total loans 539,529   539,529   536,927
Pass | Total commercial real estate | Land and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 43,901   43,901   55,564
Term loans amortized cost basis by origination, before current fiscal year 49,035   49,035   87,465
Term loans amortized cost basis by origination, two years before current fiscal year 28,375   28,375   54,214
Term loans amortized cost basis by origination, three years before current fiscal year 33,199   33,199   26,002
Term loans amortized cost basis by origination, four years before current fiscal year 23,312   23,312   4,933
Term loans amortized cost basis by origination, prior 56,313   56,313   41,749
Amortized Cost Basis 22,429   22,429   14,798
Converted to Term Loans 0   0   0
Total loans 256,564   256,564   284,725
Pass | Total consumer | Consumer mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 371,832   371,832   457,176
Term loans amortized cost basis by origination, before current fiscal year 423,243   423,243   681,844
Term loans amortized cost basis by origination, two years before current fiscal year 610,239   610,239   670,652
Term loans amortized cost basis by origination, three years before current fiscal year 622,005   622,005   947,395
Term loans amortized cost basis by origination, four years before current fiscal year 874,524   874,524   1,119,610
Term loans amortized cost basis by origination, prior 2,271,659   2,271,659   1,341,463
Amortized Cost Basis 0   0   25
Converted to Term Loans 0   0   0
Total loans 5,173,502   5,173,502   5,218,165
Pass | Total consumer | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 1,414,984   1,414,984   1,386,370
Converted to Term Loans 401,966   401,966   424,891
Total loans 1,816,950   1,816,950   1,811,261
Pass | Total consumer | Credit cards          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 174,725   174,725   184,061
Converted to Term Loans 0   0   0
Total loans 174,725   174,725   184,061
Pass | Total consumer | Other consumer loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 185,915   185,915   150,051
Term loans amortized cost basis by origination, before current fiscal year 98,124   98,124   81,087
Term loans amortized cost basis by origination, two years before current fiscal year 63,872   63,872   119,274
Term loans amortized cost basis by origination, three years before current fiscal year 89,890   89,890   144,297
Term loans amortized cost basis by origination, four years before current fiscal year 108,887   108,887   78,961
Term loans amortized cost basis by origination, prior 135,810   135,810   91,802
Amortized Cost Basis 308,754   308,754   284,801
Converted to Term Loans 0   0   0
Total loans 991,252   991,252   950,273
Special Mention | Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 1,483   1,483   1,555
Term loans amortized cost basis by origination, before current fiscal year 36,679   36,679   20,255
Term loans amortized cost basis by origination, two years before current fiscal year 7,102   7,102   17,775
Term loans amortized cost basis by origination, three years before current fiscal year 4,784   4,784   18,403
Term loans amortized cost basis by origination, four years before current fiscal year 10,467   10,467   2,464
Term loans amortized cost basis by origination, prior 5,689   5,689   36,817
Amortized Cost Basis 86,299   86,299   158,968
Converted to Term Loans 1,586   1,586   0
Total loans 154,089   154,089   256,237
Special Mention | Total commercial and industrial | Owner-occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   1,099
Term loans amortized cost basis by origination, before current fiscal year 0   0   2,466
Term loans amortized cost basis by origination, two years before current fiscal year 1,675   1,675   65,733
Term loans amortized cost basis by origination, three years before current fiscal year 48,759   48,759   5,397
Term loans amortized cost basis by origination, four years before current fiscal year 28,686   28,686   34,244
Term loans amortized cost basis by origination, prior 18,519   18,519   12,621
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 97,639   97,639   121,560
Special Mention | Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 15,681   15,681   4,583
Term loans amortized cost basis by origination, before current fiscal year 4,509   4,509   2,211
Term loans amortized cost basis by origination, two years before current fiscal year 5,009   5,009   97,443
Term loans amortized cost basis by origination, three years before current fiscal year 213,604   213,604   200,780
Term loans amortized cost basis by origination, four years before current fiscal year 123,914   123,914   0
Term loans amortized cost basis by origination, prior 32,643   32,643   68,559
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 395,360   395,360   373,576
Special Mention | Total commercial real estate | 1-4 family properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 193   193   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 750   750   1,060
Term loans amortized cost basis by origination, three years before current fiscal year 779   779   663
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   169
Term loans amortized cost basis by origination, prior 119   119   1,300
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 1,841   1,841   3,192
Special Mention | Total commercial real estate | Land and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   138
Term loans amortized cost basis by origination, two years before current fiscal year 704   704   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   25
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 267   267   390
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 971   971   553
Substandard | Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 23,326   23,326   20,920
Term loans amortized cost basis by origination, before current fiscal year 44,252   44,252   12,397
Term loans amortized cost basis by origination, two years before current fiscal year 21,194   21,194   59,487
Term loans amortized cost basis by origination, three years before current fiscal year 55,089   55,089   14,694
Term loans amortized cost basis by origination, four years before current fiscal year 10,339   10,339   39,482
Term loans amortized cost basis by origination, prior 44,949   44,949   17,028
Amortized Cost Basis 236,224   236,224   258,070
Converted to Term Loans 0   0   493
Total loans 435,373   435,373   422,571
Substandard | Total commercial and industrial | Owner-occupied          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 3,886   3,886   2,568
Term loans amortized cost basis by origination, before current fiscal year 2,789   2,789   5,838
Term loans amortized cost basis by origination, two years before current fiscal year 19,598   19,598   34,147
Term loans amortized cost basis by origination, three years before current fiscal year 47,696   47,696   20,698
Term loans amortized cost basis by origination, four years before current fiscal year 19,716   19,716   49,766
Term loans amortized cost basis by origination, prior 88,071   88,071   65,147
Amortized Cost Basis 6,581   6,581   55,904
Converted to Term Loans 0   0   0
Total loans 188,337   188,337   234,068
Substandard | Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 3,113   3,113   0
Term loans amortized cost basis by origination, before current fiscal year 1,321   1,321   1,689
Term loans amortized cost basis by origination, two years before current fiscal year 5,835   5,835   10,093
Term loans amortized cost basis by origination, three years before current fiscal year 9,404   9,404   83,795
Term loans amortized cost basis by origination, four years before current fiscal year 41,750   41,750   1,466
Term loans amortized cost basis by origination, prior 32,138   32,138   13,884
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 93,561   93,561   110,927
Substandard | Total commercial real estate | 1-4 family properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 375   375   919
Term loans amortized cost basis by origination, before current fiscal year 995   995   840
Term loans amortized cost basis by origination, two years before current fiscal year 346   346   1,618
Term loans amortized cost basis by origination, three years before current fiscal year 2,028   2,028   233
Term loans amortized cost basis by origination, four years before current fiscal year 251   251   287
Term loans amortized cost basis by origination, prior 2,962   2,962   1,857
Amortized Cost Basis 0   0   45
Converted to Term Loans 0   0   0
Total loans 6,957   6,957   5,799
Substandard | Total commercial real estate | Land and development          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   1,347
Term loans amortized cost basis by origination, two years before current fiscal year 992   992   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 46   46   153
Term loans amortized cost basis by origination, prior 733   733   719
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 1,771   1,771   2,219
Substandard | Total consumer | Consumer mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 380   380   190
Term loans amortized cost basis by origination, before current fiscal year 386   386   1,872
Term loans amortized cost basis by origination, two years before current fiscal year 3,051   3,051   5,590
Term loans amortized cost basis by origination, three years before current fiscal year 6,326   6,326   7,117
Term loans amortized cost basis by origination, four years before current fiscal year 7,204   7,204   17,918
Term loans amortized cost basis by origination, prior 46,797   46,797   37,895
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 64,144   64,144   70,582
Substandard | Total consumer | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 14,102   14,102   11,464
Converted to Term Loans 9,733   9,733   7,729
Total loans 23,835   23,835   19,193
Substandard | Total consumer | Credit cards          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 480   480   701
Converted to Term Loans 0   0   0
Total loans 480   480   701
Substandard | Total consumer | Other consumer loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 395   395   310
Term loans amortized cost basis by origination, before current fiscal year 928   928   1,046
Term loans amortized cost basis by origination, two years before current fiscal year 955   955   1,298
Term loans amortized cost basis by origination, three years before current fiscal year 1,337   1,337   2,692
Term loans amortized cost basis by origination, four years before current fiscal year 2,127   2,127   1,132
Term loans amortized cost basis by origination, prior 1,298   1,298   524
Amortized Cost Basis 57   57   59
Converted to Term Loans 0   0   0
Total loans 7,097   7,097   7,061
Doubtful | Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 485   485   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   5,911
Term loans amortized cost basis by origination, four years before current fiscal year 5,911   5,911   0
Term loans amortized cost basis by origination, prior 0   0   1,869
Amortized Cost Basis 482   482   5,145
Converted to Term Loans 0   0   0
Total loans 6,878   6,878   12,925
Doubtful | Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year         0
Term loans amortized cost basis by origination, before current fiscal year         0
Term loans amortized cost basis by origination, two years before current fiscal year         0
Term loans amortized cost basis by origination, three years before current fiscal year         39,401
Term loans amortized cost basis by origination, four years before current fiscal year         0
Term loans amortized cost basis by origination, prior         0
Amortized Cost Basis         0
Converted to Term Loans         0
Total loans         39,401
Loss | Total commercial and industrial | Commercial, financial and agricultural          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 570   570   535
Converted to Term Loans 0   0   0
Total loans 570   570   535
Loss | Total commercial real estate | Investment properties          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 5   5   5
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 5   5   5
Loss | Total consumer | Consumer mortgages          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 37   37   29
Amortized Cost Basis 0   0   0
Converted to Term Loans 0   0   0
Total loans 37   37   29
Loss | Total consumer | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 689   689   554
Converted to Term Loans 652   652   279
Total loans 1,341   1,341   833
Loss | Total consumer | Credit cards          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year 0   0   0
Term loans amortized cost basis by origination, before current fiscal year 0   0   0
Term loans amortized cost basis by origination, two years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, three years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, four years before current fiscal year 0   0   0
Term loans amortized cost basis by origination, prior 0   0   0
Amortized Cost Basis 1,162   1,162   1,109
Converted to Term Loans 0   0   0
Total loans $ 1,162   $ 1,162   1,109
Loss | Total consumer | Other consumer loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Term loans amortized cost basis by origination, current fiscal year         0
Term loans amortized cost basis by origination, before current fiscal year         0
Term loans amortized cost basis by origination, two years before current fiscal year         0
Term loans amortized cost basis by origination, three years before current fiscal year         0
Term loans amortized cost basis by origination, four years before current fiscal year         0
Term loans amortized cost basis by origination, prior         0
Amortized Cost Basis         12
Converted to Term Loans         0
Total loans         $ 12