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Allowance for Credit Losses (Portfolio Credit Quality) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Loan portfolio by credit quality indicator    
2022 $ 766,572  
2021 3,147,446 $ 3,641,975
2020 1,317,377 1,540,327
2019 787,224 885,554
2018 571,853 616,037
2017/Prior 457,805 241,896
Prior   283,362
Total loans 7,048,277 7,209,151
Commercial, financial and agricultural    
Loan portfolio by credit quality indicator    
Total loans 4,278,715 4,497,444
Commercial, financial and agricultural | Domestic | Commercial.    
Loan portfolio by credit quality indicator    
2022 187,835  
2021 977,802 1,154,047
2020 131,401 168,461
2019 70,441 78,434
2018 56,138 58,577
2017/Prior 38,003 37,178
Prior   5,155
Total loans 1,461,620 1,501,852
Commercial, financial and agricultural | Domestic | Commercial. | Pass    
Loan portfolio by credit quality indicator    
2022 157,913  
2021 895,087 1,041,763
2020 130,593 167,691
2019 69,495 77,579
2018 56,082 58,439
2017/Prior 37,946 37,104
Prior   5,144
Total loans 1,347,116 1,387,720
Commercial, financial and agricultural | Domestic | Commercial. | Special Review    
Loan portfolio by credit quality indicator    
2022 81  
2021 75,098 74,559
2020 492 497
2019 139 139
2018   81
Total loans 75,810 75,276
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Pass    
Loan portfolio by credit quality indicator    
2022 29,841  
2021 7,087 33,920
2019 807  
Prior   10
Total loans 37,735 33,930
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2021 324 3,581
2020 316 273
2019   716
2018 56 57
Prior   1
Total loans 696 4,628
Commercial, financial and agricultural | Domestic | Commercial. | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2021 206 224
2017/Prior 57 74
Total loans 263 298
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial    
Loan portfolio by credit quality indicator    
2022 275,563  
2021 722,741 1,021,054
2020 704,462 780,449
2019 284,438 292,569
2018 403,595 420,801
2017/Prior 170,746 98,606
Prior   97,577
Total loans 2,561,545 2,711,056
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Pass    
Loan portfolio by credit quality indicator    
2022 220,689  
2021 721,404 1,001,335
2020 639,609 680,777
2019 280,518 288,333
2018 403,252 417,353
2017/Prior 167,803 96,096
Prior   97,119
Total loans 2,433,275 2,581,013
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Special Review    
Loan portfolio by credit quality indicator    
2022 2,984  
2021 1,077 929
2020 1,272 1,292
2018 343 3,448
2017/Prior 60 61
Total loans 5,736 5,730
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Pass    
Loan portfolio by credit quality indicator    
2022 51,890  
2021 260 18,790
2020 9,312 44,059
2017/Prior 92 94
Prior   1
Total loans 61,554 62,944
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2020 54,053 54,097
2019 3,583 3,899
2017/Prior 2,790 2,355
Prior   456
Total loans 60,426 60,807
Commercial, financial and agricultural | Domestic | Commercial real estate: farmland & commercial | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 216 224
2019 337 337
2017/Prior 1  
Prior   1
Total loans 554 562
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily    
Loan portfolio by credit quality indicator    
2022 3,335  
2021 132,852 133,152
2020 62,997 40,897
2019 31,231 78,609
2018 6,901 10,632
2017/Prior 18,234 14,217
Prior   7,029
Total loans 255,550 284,536
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Pass    
Loan portfolio by credit quality indicator    
2022 3,335  
2021 132,852 133,152
2020 62,874 40,766
2019 31,231 78,609
2018 6,901 10,632
2017/Prior 18,234 14,217
Prior   7,029
Total loans 255,427 284,405
Commercial, financial and agricultural | Domestic | Commercial real estate: multifamily | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 123 131
Total loans 123 131
Obligations of states and political subdivisions    
Loan portfolio by credit quality indicator    
Total loans 1,742,698 1,668,113
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development    
Loan portfolio by credit quality indicator    
2022 170,274  
2021 997,584 967,431
2020 229,810 335,593
2019 295,536 308,884
2018 33,305 37,124
2017/Prior 16,189 16,642
Prior   2,439
Total loans 1,742,698 1,668,113
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Pass    
Loan portfolio by credit quality indicator    
2022 170,274  
2021 996,912 966,946
2020 206,608 312,389
2019 295,325 308,673
2018 33,305 37,124
2017/Prior 16,189 16,642
Prior   2,439
Total loans 1,718,613 1,644,213
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Special Review    
Loan portfolio by credit quality indicator    
2019 211 211
Total loans 211 211
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 23,100
Total loans 23,100 23,100
Obligations of states and political subdivisions | Domestic | Commercial Real Estate: other construction and land development | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2021 207  
Total loans 207  
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 465 485
2020 102 104
Total loans 567 589
Real estate - mortgage    
Loan portfolio by credit quality indicator    
Total loans 840,373 867,831
Real estate - mortgage | Domestic | Residential: first lien    
Loan portfolio by credit quality indicator    
2022 61,506  
2021 90,813 128,798
2020 58,476 52,812
2019 47,962 57,352
2018 39,298 49,259
2017/Prior 100,794 29,599
Prior   85,838
Total loans 398,849 403,658
Real estate - mortgage | Domestic | Residential: first lien | Pass    
Loan portfolio by credit quality indicator    
2022 61,506  
2021 89,814 128,742
2020 58,393 52,725
2019 47,861 57,249
2018 39,298 49,259
2017/Prior 100,671 29,477
Prior   85,838
Total loans 397,543 403,290
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2021 999 56
2019 101 103
2017/Prior   122
Total loans 1,100 281
Real estate - mortgage | Domestic | Residential: first lien | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 83 87
2017/Prior 123  
Total loans 206 87
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan portfolio by credit quality indicator    
2022 19,714  
2021 128,627 130,629
2020 110,051 123,062
2019 50,272 59,113
2018 26,346 30,603
2017/Prior 106,514 40,855
Prior   79,911
Total loans 441,524 464,173
Real estate - mortgage | Domestic | Residential Junior Lien | Pass    
Loan portfolio by credit quality indicator    
2022 19,714  
2021 128,627 130,629
2020 110,051 123,062
2019 50,272 59,113
2018 26,346 30,603
2017/Prior 106,514 40,855
Prior   79,911
Total loans 441,524 464,173
Consumer    
Loan portfolio by credit quality indicator    
Total loans 41,019 40,966
Consumer | Domestic    
Loan portfolio by credit quality indicator    
2022 9,251  
2021 25,436 32,053
2020 3,552 5,693
2019 985 1,370
2018 137 189
2017/Prior 1,658 9
Prior   1,652
Total loans 41,019 40,966
Consumer | Domestic | Pass    
Loan portfolio by credit quality indicator    
2022 9,251  
2021 25,436 32,053
2020 3,552 5,693
2019 985 1,370
2018 137 189
2017/Prior 1,658 9
Prior   1,652
Total loans 41,019 40,966
Foreign.    
Loan portfolio by credit quality indicator    
Total loans 145,472 134,797
Foreign. | Foreign    
Loan portfolio by credit quality indicator    
2022 39,094  
2021 71,591 74,811
2020 16,628 33,360
2019 6,359 9,223
2018 6,133 8,852
2017/Prior 5,667 4,790
Prior   3,761
Total loans 145,472 134,797
Foreign. | Foreign | Pass    
Loan portfolio by credit quality indicator    
2022 39,094  
2021 71,591 74,811
2020 16,628 33,360
2019 6,359 9,223
2018 6,133 8,852
2017/Prior 5,667 4,790
Prior   3,761
Total loans $ 145,472 $ 134,797