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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, 2022
Dec. 31, 2021
Available-for-sale debt securities    
Fair Value $ 6,729,431 $ 9,965,353
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Total investments in tax credit and other investments 607,985 628,263
Derivative    
Derivative assets - Fair value 689,100 484,184
Net derivative assets 498,784 383,231
Derivative liabilities - Fair value 692,029 390,171
Net derivative liabilities 256,948 157,444
U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 637,974 1,032,681
U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 304,395 1,301,971
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 600,323 1,228,980
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 2,068,485 2,928,283
Municipal securities    
Available-for-sale debt securities    
Fair Value 298,659 523,158
Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 445,325 496,443
Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 806,782 881,931
Corporate debt securities    
Available-for-sale debt securities    
Fair Value 630,512 649,665
Foreign government bonds    
Available-for-sale debt securities    
Fair Value 253,811 257,733
Asset-backed securities    
Available-for-sale debt securities    
Fair Value 71,362 74,558
Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 611,803 589,950
Fair Value, Measurements, Recurring    
Available-for-sale debt securities    
Fair Value 6,729,431 9,965,353
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 25,494 26,604
Total investments in tax credit and other investments 25,494 26,604
Derivative    
Derivative assets - Fair value 689,100 484,184
Netting adjustments (190,316) (100,953)
Net derivative assets 498,784 383,231
Derivative liabilities - Fair value 692,029 390,171
Netting adjustments (435,081) (232,727)
Net derivative liabilities 256,948 157,444
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 188,101 240,222
Derivative liabilities - Fair value 236,569 179,962
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 16,122 21,033
Derivative liabilities - Fair value 12,035 15,501
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative liabilities - Fair value 67 141
Fair Value, Measurements, Recurring | Equity contracts    
Derivative    
Derivative assets - Fair value 314 220
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 484,563 222,709
Derivative liabilities - Fair value 443,358 194,567
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 637,974 1,032,681
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 304,395 1,301,971
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 600,323 1,228,980
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 2,068,485 2,928,283
Fair Value, Measurements, Recurring | Municipal securities    
Available-for-sale debt securities    
Fair Value 298,659 523,158
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 445,325 496,443
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 806,782 881,931
Fair Value, Measurements, Recurring | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 630,512 649,665
Fair Value, Measurements, Recurring | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 253,811 257,733
Fair Value, Measurements, Recurring | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 71,362 74,558
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 611,803 589,950
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Available-for-sale debt securities    
Fair Value 637,974 1,032,681
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 21,137 22,130
Total investments in tax credit and other investments 21,137 22,130
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 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 637,974 1,032,681
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 6,091,457 8,932,672
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]    
Equity securities 4,357 4,474
Total investments in tax credit and other investments 4,357 4,474
Derivative    
Derivative assets - Fair value 688,791 483,969
Netting adjustments (190,316) (100,953)
Net derivative assets 498,475 383,016
Derivative liabilities - Fair value 692,029 390,171
Netting adjustments (435,081) (232,727)
Net derivative liabilities 256,948 157,444
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 188,101 240,222
Derivative liabilities - Fair value 236,569 179,962
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 16,122 21,033
Derivative liabilities - Fair value 12,035 15,501
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts    
Derivative    
Derivative liabilities - Fair value 67 141
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts    
Derivative    
Derivative assets - Fair value 5 5
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative    
Derivative assets - Fair value 484,563 222,709
Derivative liabilities - Fair value 443,358 194,567
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 304,395 1,301,971
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 600,323 1,228,980
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 2,068,485 2,928,283
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Available-for-sale debt securities    
Fair Value 298,659 523,158
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 445,325 496,443
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 806,782 881,931
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 630,512 649,665
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 253,811 257,733
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 71,362 74,558
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 611,803 589,950
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 309 215
Netting adjustments 0 0
Net derivative assets 309 215
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 liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity contracts    
Derivative    
Derivative assets - Fair value 309 215
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