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Allowance for Credit Losses (Summary of Activity In Allowance for Loan and Lease Losses) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Jan. 01, 2020
Receivables [Abstract]            
Expected credit losses on SBA-PPP loans         $ 0  
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance $ 223,936,000 $ 226,825,000 $ 225,141,000 $ 226,825,000 223,936,000  
Decrease in allowance due to COVID-19     $ 36,100,000      
Forecast period (years)     2 years      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 222,450,000 226,583,000 $ 225,141,000 223,712,000    
Provision (credits) 4,042,000 6,766,000 52,949,000 23,714,000    
Initial PCD allowance     1,193,000      
Charge-offs (8,932,000) (9,647,000) (35,257,000) (30,403,000)    
Recoveries 6,376,000 3,123,000 17,834,000 9,802,000    
Ending balance 223,936,000 226,825,000 223,936,000 226,825,000    
Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     (37,924,000)     $ (37,900,000)
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     (37,924,000)      
Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     187,217,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     187,217,000      
Commercial | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 7,290,000 32,088,000 7,290,000 35,270,000 7,290,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 6,906,000 31,944,000 33,213,000 35,270,000    
Provision (credits) 120,000 208,000 4,876,000 (3,217,000)    
Initial PCD allowance     0      
Charge-offs 0 (116,000) (138,000) (188,000)    
Recoveries 264,000 52,000 400,000 223,000    
Ending balance 7,290,000 32,088,000 7,290,000 32,088,000    
Commercial | Construction and land development | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     (31,061,000)      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     (31,061,000)      
Commercial | Construction and land development | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     2,152,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     2,152,000      
Commercial | Owner occupied commercial mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 23,092,000   23,092,000   23,092,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 22,489,000   36,444,000      
Provision (credits) 625,000   6,011,000      
Initial PCD allowance     0      
Charge-offs (87,000)   (407,000)      
Recoveries 65,000   360,000      
Ending balance 23,092,000   23,092,000      
Commercial | Owner occupied commercial mortgage | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     (19,316,000)      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     (19,316,000)      
Commercial | Owner occupied commercial mortgage | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     17,128,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     17,128,000      
Commercial | Non-owner occupied commercial mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 22,826,000   22,826,000   22,826,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 22,149,000   11,102,000      
Provision (credits) 667,000   11,165,000      
Initial PCD allowance     0      
Charge-offs 0   (8,000)      
Recoveries 10,000   107,000      
Ending balance 22,826,000   22,826,000      
Commercial | Non-owner occupied commercial mortgage | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     460,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     460,000      
Commercial | Non-owner occupied commercial mortgage | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     11,562,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     11,562,000      
Commercial | Commercial and industrial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 26,772,000 59,179,000 26,772,000 59,179,000 26,772,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 24,633,000 56,901,000 61,610,000 55,620,000    
Provision (credits) 3,381,000 4,714,000 10,802,000 10,138,000    
Initial PCD allowance     0      
Charge-offs (3,241,000) (3,047,000) (12,159,000) (8,327,000)    
Recoveries 1,999,000 611,000 4,156,000 1,748,000    
Ending balance 26,772,000 59,179,000 26,772,000 59,179,000    
Commercial | Commercial and industrial | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     (37,637,000)      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     (37,637,000)      
Commercial | Commercial and industrial | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     23,973,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     23,973,000      
Commercial | Other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance   2,215,000   2,215,000    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   2,183,000   2,221,000    
Provision (credits)   54,000   (618,000)    
Charge-offs   (42,000)   (73,000)    
Recoveries   20,000   685,000    
Ending balance   2,215,000   2,215,000    
Commercial | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance   47,850,000   43,451,000    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   48,962,000   43,451,000    
Provision (credits)   (1,337,000)   4,748,000    
Charge-offs   (1,000)   (851,000)    
Recoveries   226,000   502,000    
Ending balance   47,850,000   47,850,000    
Commercial | Other commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance   2,252,000   2,481,000    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   2,342,000   2,481,000    
Provision (credits)   (90,000)   (230,000)    
Charge-offs   0   0    
Recoveries   0   1,000    
Ending balance   2,252,000   2,252,000    
Consumer | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 1,609,000 2,898,000 1,609,000 2,898,000 1,609,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1,640,000 2,750,000 2,709,000 2,350,000    
Provision (credits) (54,000) 148,000 209,000 548,000    
Initial PCD allowance     0      
Charge-offs 0 0 (70,000) 0    
Recoveries 23,000 0 52,000 0    
Ending balance 1,609,000 2,898,000 1,609,000 2,898,000    
Consumer | Construction and land development | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     (1,291,000)      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     (1,291,000)      
Consumer | Construction and land development | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     1,418,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     1,418,000      
Consumer | Residential mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 43,731,000 17,711,000 43,731,000 17,711,000 43,731,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 42,872,000 16,932,000 18,232,000 15,472,000    
Provision (credits) 837,000 1,024,000 9,339,000 2,903,000    
Initial PCD allowance     0      
Charge-offs (253,000) (313,000) (1,513,000) (957,000)    
Recoveries 275,000 68,000 555,000 293,000    
Ending balance 43,731,000 17,711,000 43,731,000 17,711,000    
Consumer | Residential mortgage | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     17,118,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     17,118,000      
Consumer | Residential mortgage | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     35,350,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     35,350,000      
Consumer | Revolving mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 25,659,000 20,635,000 25,659,000 20,635,000 25,659,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 26,640,000 21,121,000 19,702,000 21,862,000    
Provision (credits) (958,000) (153,000) 2,557,000 (272,000)    
Initial PCD allowance     0      
Charge-offs (359,000) (534,000) (1,439,000) (1,990,000)    
Recoveries 336,000 201,000 1,174,000 1,035,000    
Ending balance 25,659,000 20,635,000 25,659,000 20,635,000    
Consumer | Revolving mortgage | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     3,665,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     3,665,000      
Consumer | Revolving mortgage | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     23,367,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     23,367,000      
Consumer | Consumer auto            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 9,183,000   9,183,000   9,183,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 8,898,000   4,292,000      
Provision (credits) 708,000   5,708,000      
Initial PCD allowance     0      
Charge-offs (824,000)   (3,023,000)      
Recoveries 401,000   1,106,000      
Ending balance 9,183,000   9,183,000      
Consumer | Consumer auto | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     1,100,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     1,100,000      
Consumer | Consumer auto | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     5,392,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     5,392,000      
Consumer | Consumer other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 38,647,000   38,647,000   38,647,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 39,295,000   30,301,000      
Provision (credits) 1,341,000   7,253,000      
Initial PCD allowance     0      
Charge-offs (3,673,000)   (13,490,000)      
Recoveries 1,684,000   4,546,000      
Ending balance 38,647,000   38,647,000      
Consumer | Consumer other | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     10,037,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     10,037,000      
Consumer | Consumer other | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     40,338,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     40,338,000      
Consumer | Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance   35,130,000   35,130,000    
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance   35,105,000   35,841,000    
Provision (credits)   3,674,000   11,991,000    
Charge-offs   (5,594,000)   (18,017,000)    
Recoveries   1,945,000   5,315,000    
Ending balance   35,130,000   35,130,000    
Non-PCD Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     217,605,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     217,605,000      
Non-PCD Loans | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance           (56,900,000)
Non-PCD Loans | Commercial | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     33,213,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     33,213,000      
Non-PCD Loans | Commercial | Commercial and industrial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     59,374,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     59,374,000      
Non-PCD Loans | Commercial | Other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     2,236,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     2,236,000      
Non-PCD Loans | Commercial | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     45,335,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     45,335,000      
Non-PCD Loans | Commercial | Other commercial real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     2,211,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     2,211,000      
Non-PCD Loans | Consumer | Construction and land development            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     2,709,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     2,709,000      
Non-PCD Loans | Consumer | Mortgage            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     18,232,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     18,232,000      
Non-PCD Loans | Consumer | Consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     34,593,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     34,593,000      
PCD Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance 25,127,000 6,867,000 25,127,000 6,867,000 $ 25,127,000  
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 26,928,000 8,343,000 7,536,000 9,144,000    
Provision (credits) (2,625,000) (1,476,000) (4,971,000) (2,277,000)    
Initial PCD allowance     1,193,000      
Charge-offs (495,000) 0 (3,010,000) 0    
Recoveries 1,319,000 0 5,378,000 0    
Ending balance $ 25,127,000 $ 6,867,000 25,127,000 $ 6,867,000    
PCD Loans | Adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     19,001,000     $ 19,000,000.0
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     19,001,000      
PCD Loans | Adjusted Balance            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Increase (decrease) in allowance     26,537,000      
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance     $ 26,537,000