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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
Jun. 30, 2019
Dec. 31, 2018
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value $ 2,592,913 $ 2,741,847
Derivative    
Derivative assets - Fair value 242,876 107,816
Derivative asset, after netting 198,673 62,670
Derivative liabilities - Fair value 172,923 118,305
Derivative liability, after netting 98,429 79,903
U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 326,535 564,815
U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 241,967 217,173
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 474,832 408,603
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 843,574 946,693
Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 87,529 82,020
Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 70,549 26,052
Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 24,539 9,931
Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 11,156 10,869
Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 484,416 463,048
Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 27,816 12,643
Fair Value, Measurements, Recurring    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 2,592,913 2,741,847
Equity securities with readily determinable fair value 31,423 31,209
Derivative    
Derivative assets - Fair value 242,876 107,816
Derivative asset netting adjustments (44,203) (45,146)
Derivative asset, after netting 198,673 62,670
Derivative liabilities - Fair value 172,923 118,305
Derivative liability netting adjustment (74,494) (38,402)
Derivative liability, after netting 98,429 79,903
Fair Value, Measurements, Recurring | Tax credit investments    
Investment securities available-for-sale    
Total investments in tax credit and other investments 31,423 31,209
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 190,388 69,818
Derivative liabilities - Fair value 124,371 75,133
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 27,849 21,624
Derivative liabilities - Fair value 22,528 19,940
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative assets - Fair value 3 1
Derivative liabilities - Fair value 118 164
Fair Value, Measurements, Recurring | Equity contracts    
Derivative    
Derivative assets - Fair value 1,985 1,951
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 22,651 14,422
Derivative liabilities - Fair value 25,906 23,068
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 326,535 564,815
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 241,967 217,173
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 474,832 408,603
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 843,574 946,693
Fair Value, Measurements, Recurring | Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 87,529 82,020
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 70,549 26,052
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 24,539 9,931
Fair Value, Measurements, Recurring | Corporate debt securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 11,156 10,869
Fair Value, Measurements, Recurring | Foreign bonds    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 484,416 463,048
Fair Value, Measurements, Recurring | Asset-backed securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 27,816 12,643
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 326,535 564,815
Equity securities with readily determinable fair value 21,466 20,678
Derivative    
Derivative assets - Fair value 0 0
Derivative asset netting adjustments 0 0
Derivative asset, after netting 0 0
Derivative liabilities - Fair value 0 0
Derivative liability netting adjustment 0 0
Derivative liability, after netting 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Tax credit investments    
Investment securities available-for-sale    
Total investments in tax credit and other investments 21,466 20,678
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    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 326,535 564,815
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 | Significant Other Observable Inputs (Level 2)    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 2,266,378 2,177,032
Equity securities with readily determinable fair value 9,957 10,531
Derivative    
Derivative assets - Fair value 242,484 107,143
Derivative asset netting adjustments (44,203) (45,146)
Derivative asset, after netting 198,281 61,997
Derivative liabilities - Fair value 172,923 118,305
Derivative liability netting adjustment (74,494) (38,402)
Derivative liability, after netting 98,429 79,903
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Tax credit investments    
Investment securities available-for-sale    
Total investments in tax credit and other investments 9,957 10,531
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts    
Derivative    
Derivative assets - Fair value 190,388 69,818
Derivative liabilities - Fair value 124,371 75,133
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 27,849 21,624
Derivative liabilities - Fair value 22,528 19,940
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts    
Derivative    
Derivative assets - Fair value 3 1
Derivative liabilities - Fair value 118 164
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts    
Derivative    
Derivative assets - Fair value 1,593 1,278
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts    
Derivative    
Derivative assets - Fair value 22,651 14,422
Derivative liabilities - Fair value 25,906 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 241,967 217,173
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 474,832 408,603
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 843,574 946,693
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Investment securities available-for-sale    
Available-for-sale debt securities, Fair Value 87,529 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 70,549 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 24,539 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 11,156 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 484,416 463,048
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 27,816 12,643
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
Derivative    
Derivative assets - Fair value 392 673
Derivative asset netting adjustments 0 0
Derivative asset, after netting 392 673
Derivative liabilities - Fair value 0 0
Derivative liability netting adjustment 0 0
Derivative liability, after netting 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Tax credit investments    
Investment securities available-for-sale    
Total investments in tax credit and other investments 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 392 673
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