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Fair Value Measurement and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investment securities available-for-sale    
Available-for-sale investment securities $ 2,956,776 $ 3,335,795
Derivative    
Derivative assets 80,466 83,780
Derivative liabilities (90,915) (82,323)
Carrying amount of investment security held-to-maturity transferred to available-for-sale 115,600  
U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 526,332 720,479
U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale investment securities 189,185 274,866
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 investment securities 315,172 266,799
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 investment securities 1,150,934 1,258,747
Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 117,242 147,654
Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,694 11,477
Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 2,327 222,377
Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,615 9,173
Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 489,140 383,894
Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 147,135 40,329
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Investment securities available-for-sale    
Available-for-sale investment securities 557,750 751,470
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps and options    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrants    
Derivative    
Derivative assets 0  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts    
Derivative    
Derivative assets   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 investment securities 526,332 720,479
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 investment securities 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 investment securities 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 investment securities 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 investment securities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 31,418 30,991
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Investment securities available-for-sale    
Available-for-sale investment securities 2,283,411 2,584,325
Derivative    
Derivative assets 79,867 83,780
Derivative liabilities (90,915) (82,323)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options    
Derivative    
Derivative assets 64,822 67,578
Derivative liabilities (64,212) (65,131)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets 14,187 11,874
Derivative liabilities (20,054) (11,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 2 3
Derivative liabilities (1) (3)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Warrants    
Derivative    
Derivative assets 856  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities (6,648) (5,976)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts    
Derivative    
Derivative assets   4,325
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 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 investment securities 189,185 274,866
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 investment securities 315,172 266,799
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 investment securities 1,150,934 1,258,747
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 117,242 147,654
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,694 11,477
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 2,327 222,377
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,615 9,173
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 489,140 383,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 102 9,338
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Investment securities available-for-sale    
Available-for-sale investment securities 115,615 0
Derivative    
Derivative assets 599 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps and options    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants    
Derivative    
Derivative assets 599  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency forward contracts    
Derivative    
Derivative assets   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 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 investment securities 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 investment securities 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 investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 115,615 0
Fair Value, Measurements, Recurring | Fair Value Measurements    
Investment securities available-for-sale    
Available-for-sale investment securities 2,956,776 3,335,795
Derivative    
Derivative assets 80,466 83,780
Derivative liabilities (90,915) (82,323)
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and options    
Derivative    
Derivative assets 64,822 67,578
Derivative liabilities (64,212) (65,131)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts    
Derivative    
Derivative assets 14,187 11,874
Derivative liabilities (20,054) (11,213)
Fair Value, Measurements, Recurring | Fair Value Measurements | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 2 3
Derivative liabilities (1) (3)
Fair Value, Measurements, Recurring | Fair Value Measurements | Warrants    
Derivative    
Derivative assets 1,455  
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities (6,648) (5,976)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign currency forward contracts    
Derivative    
Derivative assets   4,325
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 526,332 720,479
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale investment securities 189,185 274,866
Fair Value, Measurements, Recurring | Fair Value Measurements | 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 investment securities 315,172 266,799
Fair Value, Measurements, Recurring | Fair Value Measurements | 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 investment securities 1,150,934 1,258,747
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 117,242 147,654
Fair Value, Measurements, Recurring | Fair Value Measurements | Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,694 11,477
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 2,327 222,377
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,615 9,173
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 489,140 383,894
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities $ 147,135 $ 40,329