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Derivatives - Narrative (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Boe MMBTU company | Dec. 31, 2021 USD ($) Boe MMBTU company | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |
Derivative assets - Fair value | $ 755,328 | $ 484,184 |
Derivative liabilities - Fair Value | $ 887,264 | $ 390,171 |
Crude Oil |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | Boe | 12,005 | 17,924 |
Natural Gas |  |  |
Derivative [Line Items] |  |  |
Derivative, nonmonetary notional amount, energy measure | MMBTU | 247,704 | 218,770 |
Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 20,056,255 | $ 19,522,661 |
Derivative assets - Fair value | 736,283 | 484,184 |
Derivative liabilities - Fair Value | 867,577 | 389,889 |
Derivative instruments designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,534,832 | 361,531 |
Derivative assets - Fair value | 19,045 | 0 |
Derivative liabilities - Fair Value | 19,687 | 282 |
Fair Value Hedging | Derivative instruments designated as hedging instruments | Interest Expense | Certificates of deposits |  |  |
Derivative [Line Items] |  |  |
Gains (losses) recognized in interest expense |  |  | $ (1,600)
Interest Rate Swap [Member] | Fair Value Hedging | Derivative instruments designated as hedging instruments | Interest Expense |  |  |
Derivative [Line Items] |  |  |
Gains (losses) recognized in interest expense |  |  | $ 3,100
Interest rate contracts | Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | 16,932,414 | 17,575,420 |
Derivative assets - Fair value | 426,828 | 240,222 |
Derivative liabilities - Fair Value | 564,829 | 179,905 |
Interest rate contracts | Derivatives not designated as hedging instruments: | London Clearing House |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 163,400 | 20,400 |
Derivative liabilities - Fair Value | 12,100 | 105,700 |
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,450,000 | 275,000 |
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months | (41,000) |  |
Derivative assets - Fair value | 13,455 | 0 |
Derivative liabilities - Fair Value | 19,687 | 57 |
Interest rate contracts | Fair Value Hedging | Derivative instruments designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Derivative assets - Fair value | 0 | 0 |
Credit Risk Contract [Member] | Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 140,950 | $ 72,560 |
Weighted average remaining maturity of outstanding RPAs | 2 years 4 months 24 days | 3 years 2 months 12 days |
Derivative assets - Fair value | $ 0 | $ 0 |
Derivative liabilities - Fair Value | 23 | 141 |
Credit Risk Contract [Member] | Derivatives not designated as hedging instruments: | RPAs - protection sold |  |  |
Derivative [Line Items] |  |  |
Maximum exposure of RPAs with protection sold | $ 0 | $ 3,200 |
Equity, Public Companies | Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Number of companies that Issued the equity contracts (Issuers Portion Only) | company | 1 | 1 |
Equity, Private Companies | Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Number of companies that Issued the equity contracts (Issuers Portion Only) | company | 13 | 12 |
Credit-Risk-Related Contingent Features |  |  |
Derivative [Line Items] |  |  |
Aggregate fair value of derivative instruments in net liability position | $ 2,600 | $ 66,800 |
Associated posted collateral | 1,100 | 66,600 |
Foreign exchange contracts | Derivatives not designated as hedging instruments: |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,982,891 | 1,874,681 |
Derivative assets - Fair value | 47,519 | 21,033 |
Derivative liabilities - Fair Value | $ 44,117 | $ 15,276 |
Foreign exchange contracts | Derivatives not designated as hedging instruments: | Maximum |  |  |
Derivative [Line Items] |  |  |
Original maturity (in years) | 1 year | 1 year |
Commercial Banking | Interest Rate Swap [Member] | Cash Flow Hedging | Derivative instruments designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 3,250,000 |  |
Borrowings | Interest Rate Swap [Member] | Cash Flow Hedging | Derivative instruments designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 200,000 |  |

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