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Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands, U_xbrlipure in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan Customer | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for sale | $ 136,063 | $ 55,864 |
Accrued interest | 76,200 | 67,700 |
Related party balances of loans | 11,600 | 13,400 |
Related party new loans | 4,100 |  |
Related party repayments | 6,100 |  |
Short-term borrowings | 1,667,513 | 2,714,872 |
Provision for credit losses | 602,904 | 47,708 | $ 36,116
Nonaccrual loans | 139,879 | 245,833 |
TDRs both accruing and nonaccruing | 25,800 | 193,700 |
Unfunded commitment to borrowers related to modified TDR | $ 4,600 | 2,400 |
Number of customer loans excluded from TDR | Customer | 176 |  |
Loans excluded from TDR disclosure | $ 630,600 |  |
Total Past Due | 176,491 | 260,818 |
Recorded Investment > 90 Days and Accruing | 3,361 | 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 | 56,684 | 83,693 |
60-89 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 19,269 | 30,183 |
Greater Than 90 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 100,538 | 146,942 |
Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 21,600 | $ 132,500 |
Reduced interest rate | 1,100 |  |
Number of TDRs subsequently defaulted | loan |  | 0 |
Troubled Debt Restructurings [Member] | Commercial Non-Real Estate [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Equity securities | $ 6,800 |  |
Number of TDRs subsequently defaulted | loan | 2 |  |
Recorded Investment | $ 13,400 |  |
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 | 1,000 | $ 18,700 | 50,800
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Covenant waivers | 400 | 41,300 | 14,600
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Other modifications | 2,100 | 8,100 | $ 29,400
Prior to Adoption of CEFL [member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans |  | 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 |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Increase in the allowance for credit losses | $ 76,700 |  |
Downside Scenario S-1 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Weighted average percentage of forecast | 6500.00% |  |
Downside Scenario S-2 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Weighted average percentage of forecast | 2500.00% |  |
Downside Scenario S-3 [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Weighted average percentage of forecast | 1000.00% |  |
FHLB Borrowings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Short-term borrowings | $ 1,100,000 | 2,035,000 |
Executive Officer |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Related party new loans | 200 |  |
Energy Loan Portfolio [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for sale | 497,000 |  |
Net proceeds on sale of loans | 254,400 |  |
Energy Related Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for sale | 497,000 |  |
Charge-off | 242,600 |  |
Release of credit loss reserves | 82,500 |  |
Provision for credit losses | 160,100 |  |
Residential Portfolio Segment |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 40,573 | 39,262 |
Total Past Due | 67,063 | 65,028 |
Recorded Investment > 90 Days and Accruing | 912 | 85 |
Residential Portfolio Segment | 30-59 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 29,319 | 32,867 |
Residential Portfolio Segment | 60-89 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 9,858 | 8,584 |
Residential Portfolio Segment | Greater Than 90 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | $ 27,886 | 23,577 |
Residential Portfolio Segment | Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan | 2 |  | 1
Recorded Investment |  |  | $ 200
Commercial Real Estate Owner Occupied | Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan |  |  | 1
Recorded Investment | $ 800 |  | $ 1,800
Consumer Portfolio Segment |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Nonaccrual loans | 23,385 | 16,374 |
Total Past Due | 28,941 | 34,702 |
Recorded Investment > 90 Days and Accruing | 729 | 1,638 |
Real estate in process of foreclosure | 17,200 | 8,600 |
Real estate acquired through foreclosure | 3,400 | 6,300 |
Consumer Portfolio Segment | 30-59 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 12,215 | 18,586 |
Consumer Portfolio Segment | 60-89 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | 5,012 | 6,215 |
Consumer Portfolio Segment | Greater Than 90 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total Past Due | $ 11,714 | $ 9,901 |
Consumer Portfolio Segment | Troubled Debt Restructurings [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan | 1 |  | 1
Recorded Investment | $ 100 |  | $ 100

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