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Allowance for Credit Losses (Portfolio Credit Quality) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Loan portfolio by credit quality indicator    
2020 $ 2,780,901  
2019 2,078,381  
2018 1,258,687  
2017 699,686  
2016 361,598  
Prior 409,982  
Total loans 7,589,235 $ 6,894,946
Pass    
Loan portfolio by credit quality indicator    
Total loans   6,538,085
Special Review    
Loan portfolio by credit quality indicator    
Total loans   33,553
Watch List - Pass    
Loan portfolio by credit quality indicator    
Total loans   62,315
Watch List - Substandard    
Loan portfolio by credit quality indicator    
Total loans   248,318
Commercial, financial and agricultural    
Loan portfolio by credit quality indicator    
Total loans 4,426,866 3,379,837
Commercial, financial and agricultural | Domestic | Commercial    
Loan portfolio by credit quality indicator    
2020 1,167,704  
2019 342,721  
2018 202,066  
2017 133,734  
2016 20,161  
Prior 11,593  
Total loans 1,877,979 1,292,660
Commercial, financial and agricultural | Domestic | Commercial | Pass    
Loan portfolio by credit quality indicator    
2020 1,092,774  
2019 307,257  
2018 171,592  
2017 133,566  
2016 19,838  
Prior 11,571  
Total loans 1,736,598 1,228,110
Commercial, financial and agricultural | Domestic | Commercial | Special Review    
Loan portfolio by credit quality indicator    
2020 72,904  
2019 393  
Total loans 73,297 569
Commercial, financial and agricultural | Domestic | Commercial | Watch List - Pass    
Loan portfolio by credit quality indicator    
2020 1,227  
2019 34,757  
2018 29,658  
Prior 22  
Total loans 65,664 39
Commercial, financial and agricultural | Domestic | Commercial | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2018 653  
2016 323  
Total loans 976 62,007
Commercial, financial and agricultural | Domestic | Commercial | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 799  
2019 314  
2018 163  
2017 168  
Total loans 1,444  
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial    
Loan portfolio by credit quality indicator    
2020 591,460  
2019 589,188  
2018 358,790  
2017 213,213  
2016 211,450  
Prior 146,849  
Total loans 2,110,950 1,896,747
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial | Pass    
Loan portfolio by credit quality indicator    
2020 561,310  
2019 524,354  
2018 333,348  
2017 201,824  
2016 200,296  
Prior 143,109  
Total loans 1,964,241 1,710,446
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial | Special Review    
Loan portfolio by credit quality indicator    
2020 1,368  
2018 4,792  
2017 179  
2016 3,228  
Total loans 9,567 13,184
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial | Watch List - Pass    
Loan portfolio by credit quality indicator    
2020 25,467  
2019 8,885  
2018 20,482  
2017 8,879  
2016 7,448  
Prior 1  
Total loans 71,162 20,183
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2020 3,315  
2019 55,728  
2018 168  
2017 2,293  
2016 478  
Prior 3,497  
Total loans 65,479 151,726
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2019 221  
2017 38  
Prior 242  
Total loans 501  
Commercial, financial and agricultural | Domestic | Commercial Real Estate: multifamily    
Loan portfolio by credit quality indicator    
2020 49,247  
2019 220,573  
2018 83,584  
2017 64,674  
2016 8,392  
Prior 11,467  
Total loans 437,937 190,430
Commercial, financial and agricultural | Domestic | Commercial Real Estate: multifamily | Pass    
Loan portfolio by credit quality indicator    
2020 49,110  
2019 220,573  
2018 83,584  
2017 64,674  
2016 8,392  
Prior 11,467  
Total loans 437,800 190,265
Commercial, financial and agricultural | Domestic | Commercial Real Estate: multifamily | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 137  
Total loans 137  
Real estate - construction    
Loan portfolio by credit quality indicator    
Total loans 1,943,430 2,185,883
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development    
Loan portfolio by credit quality indicator    
2020 647,348  
2019 691,073  
2018 450,605  
2017 132,837  
2016 13,965  
Prior 7,602  
Total loans 1,943,430 2,185,883
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development | Pass    
Loan portfolio by credit quality indicator    
2020 613,492  
2019 665,095  
2018 450,605  
2017 132,837  
2016 13,965  
Prior 7,602  
Total loans 1,883,596 2,090,370
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development | Special Review    
Loan portfolio by credit quality indicator    
2020 12,625  
Total loans 12,625 18,721
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development | Watch List - Pass    
Loan portfolio by credit quality indicator    
2020 2,344  
2019 25,185  
Total loans 27,529 41,949
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2020 18,769  
Total loans 18,769 33,905
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 118  
2019 793  
Total loans 911  
Real estate - mortgage    
Loan portfolio by credit quality indicator    
Total loans 1,033,646 1,140,377
Real estate - mortgage | Domestic | Residential First Lien    
Loan portfolio by credit quality indicator    
2020 58,157  
2019 65,868  
2018 77,204  
2017 58,475  
2016 36,104  
Prior 114,207  
Total loans 410,015 433,901
Real estate - mortgage | Domestic | Residential First Lien | Pass    
Loan portfolio by credit quality indicator    
2020 58,068  
2019 65,854  
2018 77,011  
2017 58,475  
2016 35,966  
Prior 114,140  
Total loans 409,514 426,546
Real estate - mortgage | Domestic | Residential First Lien | Special Review    
Loan portfolio by credit quality indicator    
Total loans   253
Real estate - mortgage | Domestic | Residential First Lien | Watch List - Pass    
Loan portfolio by credit quality indicator    
2019 14  
2018 131  
Prior 1  
Total loans 146 144
Real estate - mortgage | Domestic | Residential First Lien | Watch List - Substandard    
Loan portfolio by credit quality indicator    
2018 62  
2016 50  
Total loans 112 680
Real estate - mortgage | Domestic | Residential First Lien | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
2020 89  
2016 88  
Prior 66  
Total loans 243  
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan portfolio by credit quality indicator    
2020 158,909  
2019 123,886  
2018 72,340  
2017 89,701  
2016 67,720  
Prior 111,075  
Total loans 623,631 706,476
Real estate - mortgage | Domestic | Residential Junior Lien | Pass    
Loan portfolio by credit quality indicator    
2020 158,909  
2019 123,056  
2018 72,302  
2017 88,890  
2016 67,720  
Prior 111,075  
Total loans 621,952 704,958
Real estate - mortgage | Domestic | Residential Junior Lien | Special Review    
Loan portfolio by credit quality indicator    
2019 830  
2017 811  
Total loans 1,641 826
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 41,110 47,800
Consumer | Domestic    
Loan portfolio by credit quality indicator    
2020 25,683  
2019 12,392  
2018 1,360  
2017 266  
2016 95  
Prior 1,314  
Total loans 41,110 47,800
Consumer | Domestic | Pass    
Loan portfolio by credit quality indicator    
2020 25,683  
2019 12,392  
2018 1,360  
2017 266  
2016 95  
Prior 1,311  
Total loans 41,107 46,605
Consumer | Domestic | Watch List - Doubtful    
Loan portfolio by credit quality indicator    
Prior 3  
Total loans 3  
Foreign    
Loan portfolio by credit quality indicator    
Total loans 144,183 141,049
Foreign | Foreign    
Loan portfolio by credit quality indicator    
2020 82,393  
2019 32,680  
2018 12,738  
2017 6,786  
2016 3,711  
Prior 5,875  
Total loans 144,183 141,049
Foreign | Foreign | Pass    
Loan portfolio by credit quality indicator    
2020 82,393  
2019 32,680  
2018 12,738  
2017 6,786  
2016 3,711  
Prior 5,875  
Total loans $ 144,183 $ 140,785