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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% |  |

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