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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, 2019
Dec. 31, 2018
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value $ 3,317,214 $ 2,741,847
Derivative    
Derivative assets - Fair value 330,316 107,816
Derivative asset, net 204,997 62,670
Derivative liabilities - Fair Value 256,528 118,305
Derivative liability, net 96,729 79,903
U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 176,422 564,815
U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 581,245 217,173
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 603,471 408,603
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 1,003,897 946,693
Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 102,302 82,020
Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 88,550 26,052
Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 46,548 9,931
Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 11,149 10,869
Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 354,172 463,048
Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 64,752 12,643
Collateralized loan obligations (“CLOs”)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 284,706  
Fair Value, Measurements, Recurring    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 3,317,214 2,741,847
Equity Securities with readily determinable fair value 31,673 31,209
Total investments in tax credit and other investments 31,673 31,209
Derivative    
Derivative assets - Fair value 330,316 107,816
Netting adjustments (125,319) (45,146)
Derivative asset, net 204,997 62,670
Derivative liabilities - Fair Value 256,528 118,305
Netting adjustments (159,799) (38,402)
Derivative liability, net 96,729 79,903
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 192,883 69,818
Derivative liabilities - Fair Value 127,317 75,133
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 54,637 21,624
Derivative liabilities - Fair Value 48,610 19,940
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative assets - Fair value 2 1
Derivative liabilities - Fair Value 84 164
Fair Value, Measurements, Recurring | Equity warrants    
Derivative    
Derivative assets - Fair value 1,414 1,951
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 81,380 14,422
Derivative liabilities - Fair Value 80,517 23,068
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 176,422 564,815
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 581,245 217,173
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 603,471 408,603
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 1,003,897 946,693
Fair Value, Measurements, Recurring | Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 102,302 82,020
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 88,550 26,052
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 46,548 9,931
Fair Value, Measurements, Recurring | Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 11,149 10,869
Fair Value, Measurements, Recurring | Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 354,172 463,048
Fair Value, Measurements, Recurring | Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 64,752 12,643
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 284,706  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 176,422 564,815
Equity Securities with readily determinable fair value 21,746 20,678
Total investments in tax credit and other investments 21,746 20,678
Derivative    
Derivative assets - Fair value 0 0
Netting adjustments 0 0
Derivative asset, net 0 0
Derivative liabilities - Fair Value 0 0
Netting adjustments 0 0
Derivative liability, net 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 warrants    
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 176,422 564,815
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign bonds    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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”)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 3,140,792 2,177,032
Equity Securities with readily determinable fair value 9,927 10,531
Total investments in tax credit and other investments 9,927 10,531
Derivative    
Derivative assets - Fair value 329,895 107,143
Netting adjustments (125,319) (45,146)
Derivative asset, net 204,576 61,997
Derivative liabilities - Fair Value 256,528 118,305
Netting adjustments (159,799) (38,402)
Derivative liability, net 96,729 79,903
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 192,883 69,818
Derivative liabilities - Fair Value 127,317 75,133
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 54,637 21,624
Derivative liabilities - Fair Value 48,610 19,940
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts    
Derivative    
Derivative assets - Fair value 2 1
Derivative liabilities - Fair Value 84 164
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity warrants    
Derivative    
Derivative assets - Fair value 993 1,278
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative    
Derivative assets - Fair value 81,380 14,422
Derivative liabilities - Fair Value 80,517 23,068
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 581,245 217,173
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 603,471 408,603
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 1,003,897 946,693
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 102,302 82,020
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 88,550 26,052
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 46,548 9,931
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 11,149 10,869
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 354,172 463,048
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 64,752 12,643
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 284,706  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Equity Securities with readily determinable fair value 0 0
Total investments in tax credit and other investments 0 0
Derivative    
Derivative assets - Fair value 421 673
Netting adjustments 0 0
Derivative asset, net 421 673
Derivative liabilities - Fair Value 0 0
Netting adjustments 0 0
Derivative liability, net 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 warrants    
Derivative    
Derivative assets - Fair value 421 673
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 0 $ 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (“CLOs”)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value $ 0