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Loans and Allowance for Credit Losses (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
loan
Customer
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Accrued interest $ 86,000   $ 86,000   $ 67,700
Weighted average percentage of forecast 50.00%   50.00%    
Loans held for sale $ 103,566   $ 103,566   55,864
Provision for credit losses 24,999 $ 12,421 578,690 $ 38,552  
Nonaccrual loans 171,462   171,462   245,833
Estimated interest income from nonaccrual loans not assigned to nonaccrual status     10,600 $ 9,900  
TDRs both accruing and nonaccruing 49,100   49,100   193,700
Unfunded commitment to borrowers related to modified TDR $ 1,000   1,000   2,400
TDRs and loans impaired with minimum aggregate relationship balances     $ 1,000    
Number of customer loans excluded from TDR | Customer 817   817    
Loans excluded from TDR disclosure     $ 564,800    
Total Past Due $ 218,965   218,965   260,818
Recorded Investment > 90 Days and Accruing 10,439   10,439   6,582
Purchased with credit deterioration, increase     19,800    
30-59 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 20,417   20,417   83,693
60-89 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 63,428   63,428   30,183
Greater Than 90 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 135,120   135,120   146,942
Troubled Debt Restructurings [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans 39,900   39,900   132,500
Number of TDRs subsequently defaulted | loan       0  
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Extended terms and other payment concessions     700 $ 600  
Troubled Debt Restructurings [Member] | Loans With Reduction Of Interest Rate [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Reduced interest rate     1,100    
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Covenant waivers     400 22,100  
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Other modifications     2,100 $ 7,400  
Prior to Adoption of CEFL [member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans $ 17,500   $ 17,500    
Recorded Investment > 90 Days and Accruing         8,300
Prior to Adoption of CEFL [member] | 30-59 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due         6,100
Prior to Adoption of CEFL [member] | 60-89 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due         2,000
Prior to Adoption of CEFL [member] | Greater Than 90 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due         8,300
Downside Scenario S-1 [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Weighted average percentage of forecast 25.00%   25.00%    
Downside Scenario S-2 [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Weighted average percentage of forecast 25.00%   25.00%    
Energy Related Loans [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans held for sale $ 497,000   $ 497,000    
Charge-off     242,600    
Release of credit loss reserves     82,500    
Provision for credit losses     160,100    
Consumer [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans 24,737   24,737   16,374
Total Past Due 26,992   26,992   34,702
Recorded Investment > 90 Days and Accruing 515   515   1,638
Real estate in process of foreclosure 11,200   11,200   8,600
Real estate acquired through foreclosure 3,600   3,600   6,300
Consumer [Member] | 30-59 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 9,451   9,451   18,586
Consumer [Member] | 60-89 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 4,621   4,621   6,215
Consumer [Member] | Greater Than 90 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 12,920   $ 12,920   9,901
Consumer [Member] | Troubled Debt Restructurings [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of TDRs subsequently defaulted | loan     2    
TDRs subsequently defaulted, amount     $ 200    
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of TDRs subsequently defaulted | loan     1    
TDRs subsequently defaulted, amount     $ 400    
Residential Mortgages [Member] | Troubled Debt Restructurings [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of TDRs subsequently defaulted | loan     1    
TDRs subsequently defaulted, amount     $ 600    
Total Commercial And Industrial [Member] | Total Commercial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Nonaccrual loans 92,867   92,867   186,386
Total Past Due 100,527   100,527   147,830
Recorded Investment > 90 Days and Accruing 5,223   5,223   2,367
Total Commercial And Industrial [Member] | Total Commercial [Member] | 30-59 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 6,561   6,561   25,755
Total Commercial And Industrial [Member] | Total Commercial [Member] | 60-89 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 16,553   16,553   14,001
Total Commercial And Industrial [Member] | Total Commercial [Member] | Greater Than 90 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due $ 77,413   $ 77,413   108,074
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans interest bearing rate 1.00%   1.00%    
Nonaccrual loans $ 78,184   $ 78,184   178,678
Total Past Due 86,008   86,008   135,144
Recorded Investment > 90 Days and Accruing 5,110   5,110   1,537
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | 30-59 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 6,026   6,026   20,893
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | 60-89 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due 14,277   14,277   13,445
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] | Greater Than 90 Days Past Due [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Total Past Due $ 65,705   $ 65,705   $ 100,806
Total Commercial And Industrial [Member] | Minimum [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans term     2 years    
Loans percentage of origination fee 1.00%   1.00%    
Total Commercial And Industrial [Member] | Maximum [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loans term     5 years    
Loans percentage of origination fee 5.00%   5.00%