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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
Dec. 31, 2021
Dec. 31, 2020
Debt securities available-for-sale    
Fair Value $ 9,965,353 $ 5,544,658
Investments in tax credit and other investments, net 338,522 266,525
Derivative    
Derivative assets - Fair value 484,184 602,754
Derivative asset, after netting 383,231 501,242
Derivative liabilities - Fair Value 390,171 424,828
Derivative liability, after netting 157,444 240,131
U.S. Treasury securities    
Debt securities available-for-sale    
Fair Value 1,032,681 50,761
U.S. government agency and U.S. government-sponsored enterprise debt securities    
Debt securities available-for-sale    
Fair Value 1,301,971 814,319
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 1,228,980 1,153,770
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 2,928,283 1,660,894
Municipal securities    
Debt securities available-for-sale    
Fair Value 523,158 396,073
Non-agency commercial mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 496,443 239,842
Non-agency residential mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 881,931 289,775
Corporate debt securities    
Debt securities available-for-sale    
Fair Value 649,665 405,968
Asset-backed securities    
Debt securities available-for-sale    
Fair Value 74,558 63,231
Collateralized loan obligations (“CLOs”)    
Debt securities available-for-sale    
Fair Value 589,950 287,494
Fair Value, Measurements, Recurring    
Debt securities available-for-sale    
Fair Value 9,965,353 5,544,658
Equity Securities with readily determinable fair value 26,604 31,272
Investments in tax credit and other investments, net 26,604 31,272
Derivative    
Derivative assets - Fair value 484,184 602,754
Netting adjustments (100,953) (101,512)
Derivative asset, after netting 383,231 501,242
Derivative liabilities - Fair Value 390,171 424,828
Netting adjustments (232,727) (184,697)
Derivative liability, after netting 157,444 240,131
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 240,222 489,132
Derivative liabilities - Fair Value 179,962 317,698
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 21,033 30,300
Derivative liabilities - Fair Value 15,501 22,759
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative assets - Fair value 0 13
Derivative liabilities - Fair Value 141 206
Fair Value, Measurements, Recurring | Equity contracts    
Derivative    
Derivative assets - Fair value 220 858
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 222,709 82,451
Derivative liabilities - Fair Value 194,567 84,165
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Debt securities available-for-sale    
Fair Value 1,032,681 50,761
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Debt securities available-for-sale    
Fair Value 1,301,971 814,319
Fair Value, Measurements, Recurring | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 1,228,980 1,153,770
Fair Value, Measurements, Recurring | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 2,928,283 1,660,894
Fair Value, Measurements, Recurring | Municipal securities    
Debt securities available-for-sale    
Fair Value 523,158 396,073
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 496,443 239,842
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 881,931 289,775
Fair Value, Measurements, Recurring | Corporate debt securities    
Debt securities available-for-sale    
Fair Value 649,665 405,968
Fair Value, Measurements, Recurring | Asset-backed securities    
Debt securities available-for-sale    
Fair Value 74,558 63,231
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)    
Debt securities available-for-sale    
Fair Value 589,950 287,494
Fair Value, Measurements, Recurring | Foreign government bonds    
Debt securities available-for-sale    
Fair Value 257,733 182,531
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Debt securities available-for-sale    
Fair Value 1,032,681 50,761
Equity Securities with readily determinable fair value 22,130 22,548
Investments in tax credit and other investments, net 22,130 22,548
Derivative    
Derivative assets - Fair value 0 0
Netting adjustments 0 0
Derivative asset, after netting 0 0
Derivative liabilities - Fair Value 0 0
Netting adjustments 0 0
Derivative liability, after netting 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    
Debt securities available-for-sale    
Fair Value 1,032,681 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    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency commercial mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations (“CLOs”)    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government bonds    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Debt securities available-for-sale    
Fair Value 8,932,672 5,493,897
Equity Securities with readily determinable fair value 4,474 8,724
Investments in tax credit and other investments, net 4,474 8,724
Derivative    
Derivative assets - Fair value 483,969 602,481
Netting adjustments (100,953) (101,512)
Derivative asset, after netting 383,016 500,969
Derivative liabilities - Fair Value 390,171 424,828
Netting adjustments (232,727) (184,697)
Derivative liability, after netting 157,444 240,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 240,222 489,132
Derivative liabilities - Fair Value 179,962 317,698
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 21,033 30,300
Derivative liabilities - Fair Value 15,501 22,759
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts    
Derivative    
Derivative assets - Fair value 0 13
Derivative liabilities - Fair Value 141 206
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts    
Derivative    
Derivative assets - Fair value 5 585
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative    
Derivative assets - Fair value 222,709 82,451
Derivative liabilities - Fair Value 194,567 84,165
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Debt securities available-for-sale    
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    
Debt securities available-for-sale    
Fair Value 1,301,971 814,319
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 1,228,980 1,153,770
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 2,928,283 1,660,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Debt securities available-for-sale    
Fair Value 523,158 396,073
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 496,443 239,842
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 881,931 289,775
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Debt securities available-for-sale    
Fair Value 649,665 405,968
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Debt securities available-for-sale    
Fair Value 74,558 63,231
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)    
Debt securities available-for-sale    
Fair Value 589,950 287,494
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government bonds    
Debt securities available-for-sale    
Fair Value 257,733 182,531
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Debt securities available-for-sale    
Fair Value 0 0
Equity Securities with readily determinable fair value 0 0
Investments in tax credit and other investments, net 0 0
Derivative    
Derivative assets - Fair value 215 273
Netting adjustments 0 0
Derivative asset, after netting 215 273
Derivative liabilities - Fair Value 0 0
Netting adjustments 0 0
Derivative liability, after netting 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 215 273
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    
Debt securities available-for-sale    
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    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed Securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (“CLOs”)    
Debt securities available-for-sale    
Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government bonds    
Debt securities available-for-sale    
Fair Value $ 0 $ 0