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Allowance for Credit Losses (Troubled Debt Restructuring) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring $ 179,805   $ 171,192
Nonaccruing 174,571 $ 168,717 114,946
Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     77,536
Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     2,766
Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     61,935
Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     571
Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     11,839
Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     425
Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     93,656
Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     3,882
Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 51,108   57,861
Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     28,399
Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     3,514
Accruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 133,623   128,750
Accruing | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     61,627
Accruing | Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     487
Accruing | Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     50,819
Accruing | Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     571
Accruing | Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     9,430
Accruing | Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     320
Accruing | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     67,123
Accruing | Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     1,452
Accruing | Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 35,288   41,813
Accruing | Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     21,032
Accruing | Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     2,826
Nonaccruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 46,182   42,442
Nonaccruing | Commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     15,909
Nonaccruing | Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     2,279
Nonaccruing | Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     11,116
Nonaccruing | Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     0
Nonaccruing | Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     2,409
Nonaccruing | Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     105
Nonaccruing | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring     26,533
Nonaccruing | Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     2,430
Nonaccruing | Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 15,820   16,048
Nonaccruing | Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     7,367
Nonaccruing | Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing     688
Non-PCD Loans | Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 2,623    
Non-PCD Loans | Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 43,857    
Non-PCD Loans | Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 11,757    
Non-PCD Loans | Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 12,521    
Non-PCD Loans | Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 70,758    
Non-PCD Loans | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 89,989    
Non-PCD Loans | Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 2,736    
Non-PCD Loans | Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 29,883    
Non-PCD Loans | Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 5,077    
Non-PCD Loans | Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 1,185    
Non-PCD Loans | Accruing | Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 1,086    
Non-PCD Loans | Accruing | Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 33,704    
Non-PCD Loans | Accruing | Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 11,438    
Non-PCD Loans | Accruing | Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 9,914    
Non-PCD Loans | Accruing | Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 56,142    
Non-PCD Loans | Accruing | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 63,420    
Non-PCD Loans | Accruing | Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 2,018    
Non-PCD Loans | Accruing | Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 22,677    
Non-PCD Loans | Accruing | Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 2,376    
Non-PCD Loans | Accruing | Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 1,061    
Non-PCD Loans | Nonaccruing | Commercial | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 1,537    
Non-PCD Loans | Nonaccruing | Commercial | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 10,153    
Non-PCD Loans | Nonaccruing | Commercial | Other commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 319    
Non-PCD Loans | Nonaccruing | Commercial | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 2,607    
Non-PCD Loans | Nonaccruing | Commercial | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 14,616    
Non-PCD Loans | Nonaccruing | Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 26,569    
Non-PCD Loans | Nonaccruing | Consumer | Construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 718    
Non-PCD Loans | Nonaccruing | Consumer | Mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 7,206    
Non-PCD Loans | Nonaccruing | Consumer | Revolving mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 2,701    
Non-PCD Loans | Nonaccruing | Consumer | Consumer and Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccruing 124    
PCD Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 19,058   $ 17,200
PCD Loans | Accruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring 14,061    
PCD Loans | Nonaccruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructuring $ 4,997