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Fair Value Measurement and Fair Value of Financial Instruments (Financial Assets and Liabilities Measurement on Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale debt securities    
Fair Value $ 7,789,213 $ 5,544,658
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Total investments in tax credit and other investments 361,438 266,525
Derivative    
Derivative assets - Fair value 457,317 602,754
Net derivative assets 349,082 501,242
Derivative liabilities - Fair value 344,135 424,828
Net derivative liabilities 157,448 240,131
U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 826,342 50,761
U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 1,194,005 814,319
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 1,169,391 1,153,770
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 2,247,406 1,660,894
Municipal securities    
Available-for-sale debt securities    
Fair Value 420,065 396,073
Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 281,027 239,842
Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 523,500 289,775
Corporate debt securities    
Available-for-sale debt securities    
Fair Value 496,643 405,968
Foreign government bonds    
Available-for-sale debt securities    
Fair Value 276,328 182,531
Asset-backed securities    
Available-for-sale debt securities    
Fair Value 63,040 63,231
Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 291,466 287,494
Fair Value, Measurements, Recurring    
Available-for-sale debt securities    
Fair Value 7,789,213 5,544,658
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 26,693 31,272
Total investments in tax credit and other investments 26,693 31,272
Derivative    
Derivative assets - Fair value 457,317 602,754
Netting adjustments (108,235) (101,512)
Net derivative assets 349,082 501,242
Derivative liabilities - Fair value 344,135 424,828
Netting adjustments (186,687) (184,697)
Net derivative liabilities 157,448 240,131
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 319,049 489,132
Derivative liabilities - Fair value 230,290 317,698
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 39,562 30,300
Derivative liabilities - Fair value 27,287 22,759
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative assets - Fair value 5 13
Derivative liabilities - Fair value 153 206
Fair Value, Measurements, Recurring | Equity contracts    
Derivative    
Derivative assets - Fair value 272 858
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 98,429 82,451
Derivative liabilities - Fair value 86,405 84,165
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 826,342 50,761
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 1,194,005 814,319
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 1,169,391 1,153,770
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 2,247,406 1,660,894
Fair Value, Measurements, Recurring | Municipal securities    
Available-for-sale debt securities    
Fair Value 420,065 396,073
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 281,027 239,842
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 523,500 289,775
Fair Value, Measurements, Recurring | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 496,643 405,968
Fair Value, Measurements, Recurring | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 276,328 182,531
Fair Value, Measurements, Recurring | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 63,040 63,231
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 291,466 287,494
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Available-for-sale debt securities    
Fair Value 826,342 50,761
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 22,233 22,548
Total investments in tax credit and other investments 22,233 22,548
Derivative    
Derivative assets - Fair value 0 0
Netting adjustments 0 0
Net derivative assets 0 0
Derivative liabilities - Fair value 0 0
Netting adjustments 0 0
Net derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity contracts    
Derivative    
Derivative assets - Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 826,342 50,761
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Available-for-sale debt securities    
Fair Value 6,962,871 5,493,897
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 4,460 8,724
Total investments in tax credit and other investments 4,460 8,724
Derivative    
Derivative assets - Fair value 457,045 602,481
Netting adjustments (108,235) (101,512)
Net derivative assets 348,810 500,969
Derivative liabilities - Fair value 344,135 424,828
Netting adjustments (186,687) (184,697)
Net derivative liabilities 157,448 240,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 319,049 489,132
Derivative liabilities - Fair value 230,290 317,698
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 39,562 30,300
Derivative liabilities - Fair value 27,287 22,759
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts    
Derivative    
Derivative assets - Fair value 5 13
Derivative liabilities - Fair value 153 206
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts    
Derivative    
Derivative assets - Fair value 0 585
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative    
Derivative assets - Fair value 98,429 82,451
Derivative liabilities - Fair value 86,405 84,165
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 1,194,005 814,319
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 1,169,391 1,153,770
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 2,247,406 1,660,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Available-for-sale debt securities    
Fair Value 420,065 396,073
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 281,027 239,842
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 523,500 289,775
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 496,643 405,968
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 276,328 182,531
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 63,040 63,231
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 291,466 287,494
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Available-for-sale debt securities    
Fair Value 0 0
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 0 0
Total investments in tax credit and other investments 0 0
Derivative    
Derivative assets - Fair value 272 273
Netting adjustments 0 0
Net derivative assets 272 273
Derivative liabilities - Fair value 0 0
Netting adjustments 0 0
Net derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Credit contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity contracts    
Derivative    
Derivative assets - Fair value 272 273
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commodity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value $ 0 $ 0