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Allowance for Credit Losses (Portfolio Credit Quality) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Loan portfolio by credit quality indicator    
2021 $ 3,641,975  
2020 1,540,327 $ 3,601,680
2019 885,554 1,627,511
2018 616,037 1,087,031
2017 241,896 556,923
2016/Prior 283,362 327,336
Prior   341,273
Total loans 7,209,151 7,541,754
Commercial, financial and agricultural    
Loan portfolio by credit quality indicator    
Total loans 4,497,444 4,516,288
Commercial, financial and agricultural | Domestic | Commercial.    
Loan portfolio by credit quality indicator    
2021 1,154,047  
2020 168,461 1,288,332
2019 78,434 241,724
2018 58,577 146,051
2017 37,178 85,596
2016/Prior 5,155 14,216
Prior   10,017
Total loans 1,501,852 1,785,936
Commercial, financial and agricultural | Domestic | Commercial. | Pass    
Loan portfolio by credit quality indicator    
2021 1,041,763  
2020 167,691 1,168,671
2019 77,579 240,869
2018 58,439 145,670
2017 37,104 85,434
2016/Prior 5,144 13,901
Prior   10,000
Total loans 1,387,720 1,664,545
Commercial, financial and agricultural | Domestic | Commercial. | Special Review    
Loan portfolio by credit quality indicator    
2021 74,559  
2020 497 75,638
2019 139  
2018 81  
Total loans 75,276 75,638
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Pass    
Loan portfolio by credit quality indicator    
2021 33,920  
2020   39,886
2019   11
2017   3
2016/Prior 10  
Prior   17
Total loans 33,930 39,917
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2021 3,581  
2020 273 3,360
2019 716 683
2018 57 289
2016/Prior 1 315
Total loans 4,628 4,647
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2021 224  
2020   777
2019   161
2018   92
2017 74 159
Total loans 298 1,189
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Loan portfolio by credit quality indicator    
2021 1,021,054  
2020 780,449 1,002,557
2019 292,569 380,123
2018 420,801 391,303
2017 98,606 192,165
2016/Prior 97,577 206,193
Prior   116,967
Total loans 2,711,056 2,289,308
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Pass    
Loan portfolio by credit quality indicator    
2021 1,001,335  
2020 680,777 884,070
2019 288,333 373,993
2018 417,353 386,268
2017 96,096 189,639
2016/Prior 97,119 202,500
Prior   116,729
Total loans 2,581,013 2,153,199
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Special Review    
Loan portfolio by credit quality indicator    
2021 929  
2020 1,292 3,041
2018 3,448 4,758
2017 61 177
2016/Prior   3,218
Total loans 5,730 11,194
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Pass    
Loan portfolio by credit quality indicator    
2021 18,790  
2020 44,059 61,637
2019   942
2018   277
2017 94 80
2016/Prior 1  
Total loans 62,944 62,936
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2020 54,097 53,809
2019 3,899 4,986
2017 2,355 2,269
2016/Prior 456 475
Prior   1
Total loans 60,807 61,540
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 224  
2019 337 202
2016/Prior 1  
Prior   237
Total loans 562 439
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Loan portfolio by credit quality indicator    
2021 133,152  
2020 40,897 74,711
2019 78,609 208,356
2018 10,632 82,818
2017 14,217 64,110
2016/Prior 7,029 6,801
Prior   4,248
Total loans 284,536 441,044
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Pass    
Loan portfolio by credit quality indicator    
2021 133,152  
2020 40,766 74,577
2019 78,609 208,356
2018 10,632 82,818
2017 14,217 64,110
2016/Prior 7,029 6,801
Prior   4,248
Total loans 284,405 440,910
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 131 134
2019  
2018  
2017  
2016/Prior  
Prior  
Total loans 131 134
Obligations of states and political subdivisions    
Loan portfolio by credit quality indicator    
Total loans 1,668,113 1,846,757
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Loan portfolio by credit quality indicator    
2021 967,431  
2020 335,593 833,796
2019 308,884 600,602
2018 37,124 320,308
2017 16,642 78,174
2016/Prior 2,439 10,534
Prior   3,343
Total loans 1,668,113 1,846,757
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Pass    
Loan portfolio by credit quality indicator    
2021 966,946  
2020 312,389 773,165
2019 308,673 576,707
2018 37,124 320,308
2017 16,642 78,174
2016/Prior 2,439 10,534
Prior   3,343
Total loans 1,644,213 1,762,231
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Special Review    
Loan portfolio by credit quality indicator    
2020   20,828
2019 211 21,650
2018  
2017  
2016/Prior  
Prior  
Total loans 211 42,478
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Watch List - Pass    
Loan portfolio by credit quality indicator    
2020 23,100 23,101
2019   1,451
Total loans 23,100 24,552
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2021 485  
2020 104 16,702
2019   794
Total loans 589 17,496
Real estate - mortgage    
Loan portfolio by credit quality indicator    
Total loans 867,831 999,144
Real estate - mortgage | Domestic | Residential: first lien    
Loan portfolio by credit quality indicator    
2021 128,798  
2020 52,812 81,090
2019 57,352 62,179
2018 49,259 72,430
2017 29,599 54,593
2016/Prior 85,838 29,299
Prior   105,528
Total loans 403,658 405,119
Real estate - mortgage | Domestic | Residential: first lien | Pass    
Loan portfolio by credit quality indicator    
2021 128,742  
2020 52,725 81,004
2019 57,249 62,165
2018 49,259 72,299
2017 29,477 54,593
2016/Prior 85,838 29,250
Prior   105,463
Total loans 403,290 404,774
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Pass    
Loan portfolio by credit quality indicator    
2019   14
2018   131
Total loans   145
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2021 56  
2019 103  
2017 122  
2016/Prior   49
Total loans 281 49
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 87 86
Prior   65
Total loans 87 151
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan portfolio by credit quality indicator    
2021 130,629  
2020 123,062 197,048
2019 59,113 108,276
2018 30,603 61,674
2017 40,855 75,868
2016/Prior 79,911 56,705
Prior   94,454
Total loans 464,173 594,025
Real estate - mortgage | Domestic | Residential Junior Lien | Pass    
Loan portfolio by credit quality indicator    
2021 130,629  
2020 123,062 196,308
2019 59,113 108,276
2018 30,603 61,636
2017 40,855 75,056
2016/Prior 79,911 56,705
Prior   94,454
Total loans 464,173 592,435
Real estate - mortgage | Domestic | Residential Junior Lien | Special Review    
Loan portfolio by credit quality indicator    
2020   740
2019  
2018  
2017   812
2016/Prior  
Prior  
Total loans   1,552
Real estate - mortgage | Domestic | Residential Junior Lien | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2018   38
Total loans   38
Consumer    
Loan portfolio by credit quality indicator    
Total loans 40,966 40,595
Consumer | Domestic    
Loan portfolio by credit quality indicator    
2021 32,053  
2020 5,693 30,910
2019 1,370 7,159
2018 189 875
2017 9 225
2016/Prior 1,652 55
Prior   1,371
Total loans 40,966 40,595
Consumer | Domestic | Pass    
Loan portfolio by credit quality indicator    
2021 32,053  
2020 5,693 30,910
2019 1,370 7,159
2018 189 875
2017 9 225
2016/Prior 1,652 55
Prior   1,371
Total loans 40,966 40,595
Foreign.    
Loan portfolio by credit quality indicator    
Total loans 134,797 138,970
Foreign. | Foreign    
Loan portfolio by credit quality indicator    
2021 74,811  
2020 33,360 93,236
2019 9,223 19,092
2018 8,852 11,572
2017 4,790 6,192
2016/Prior 3,761 3,533
Prior   5,345
Total loans 134,797 138,970
Foreign. | Foreign | Pass    
Loan portfolio by credit quality indicator    
2021 74,811  
2020 33,360 93,236
2019 9,223 19,092
2018 8,852 11,572
2017 4,790 6,192
2016/Prior 3,761 3,533
Prior   5,345
Total loans $ 134,797 $ 138,970