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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans $ 558,716   $ 606,576 $ 762,998 $ 809,169
Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 284,329   296,672    
Commercial | Pass          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 148,412   141,922    
Commercial | Special mention          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 44,290   48,475    
Commercial | Substandard          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 87,970   101,447    
Commercial | Doubtful          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 3,657   4,828    
Commercial | Ungraded          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
PCI commercial loans 0   0    
Non-PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 28,116,245   24,781,818    
Past Due 206,535   134,882    
Nonaccruing 114,946   84,546    
Non-PCI Loans | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 18,477,856   16,101,608    
Past Due 74,146   35,619    
Nonaccruing 42,407   18,529    
Non-PCI Loans | Commercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 1,007,411   756,885    
Past Due 6,043   969    
Nonaccruing 4,281   666    
Non-PCI Loans | Commercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 12,245,153   10,697,731    
Past Due 37,482   19,503    
Nonaccruing 29,733   12,594    
Non-PCI Loans | Commercial | Other commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 540,138   426,518    
Past Due 1,890   467    
Nonaccruing 708   366    
Non-PCI Loans | Commercial | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 4,375,649   3,924,424    
Past Due 28,143   14,306    
Nonaccruing 7,365   4,624    
Non-PCI Loans | Commercial | Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 309,505   296,050    
Past Due 588   374    
Nonaccruing 320   279    
Non-PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 9,638,389   8,680,210    
Past Due 132,389   99,263    
Nonaccruing 72,539   66,017    
Non-PCI Loans | Noncommercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 354,393   254,837    
Past Due 2,992   2,193    
Nonaccruing 2,828   1,823    
Non-PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 5,205,380   4,214,783    
Past Due 88,537   50,904    
Non-PCI Loans | Noncommercial | Revolving mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 2,316,010   2,514,269    
Past Due 23,062   28,706    
Nonaccruing 22,411   25,563    
Non-PCI Loans | Noncommercial | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 1,762,606   1,696,321    
Past Due 17,798   17,460    
Nonaccruing 2,943   2,969    
PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccruing   $ 6,700 1,300    
PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current 240,995        
PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Current     268,280    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 109,742   76,187    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 42,716   24,747    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 3,146   516    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 20,389   14,200    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 861   91    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 18,269   9,655    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 51   285    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 67,026   51,440    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 977   581    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 45,839   28,239    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 9,729   12,585    
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 10,481   10,035    
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 13,764        
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due     11,155    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 40,274   19,682    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 14,553   3,910    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 195   9    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 8,774   2,066    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 331   76    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 4,842   1,759    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 411   0    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 25,721   15,772    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 218   21    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 18,289   7,357    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 3,468   4,490    
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 3,746   3,904    
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 5,608        
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due     7,708    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 56,519   39,013    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 16,877   6,962    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 2,702   444    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 8,319   3,237    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 698   300    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 5,032   2,892    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 126   89    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 39,642   32,051    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 1,797   1,591    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 24,409   15,308    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 9,865   11,631    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due 3,571   3,521    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due $ 14,020        
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past Due     $ 22,761