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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, 2017
Dec. 31, 2016
Investment securities available-for-sale    
Available-for-sale investment securities $ 3,016,752 $ 3,335,795
Derivative    
Derivative assets 66,146 83,780
Derivative liabilities (74,935) (82,323)
Transfer of security, from held-to-maturity, to available-for-sale 115,600  
U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 640,280 720,479
U.S. government agency and U.S. government sponsored enterprise debt securities    
Investment securities available-for-sale    
Available-for-sale investment securities 203,392 274,866
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 318,957 266,799
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 1,190,271 1,258,747
Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 99,982 147,654
Non-agency residential mortgage-backed securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 9,117 11,477
Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 37,003 222,377
Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities   9,173
Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 486,408 383,894
Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 31,342 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 661,015 751,470
Derivative    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts    
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) | 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) | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 640,280 720,479
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
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 20,735 30,991
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Investment securities available-for-sale    
Available-for-sale investment securities 2,355,737 2,584,325
Derivative    
Derivative assets 65,467 83,780
Derivative liabilities (74,935) (82,323)
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) | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities (6,799) (5,976)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options    
Derivative    
Derivative assets 58,633 67,578
Derivative liabilities (57,958) (65,131)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts    
Derivative    
Derivative assets 5,840 11,874
Derivative liabilities (10,170) (11,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 1 3
Derivative liabilities (8) (3)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Warrants    
Derivative    
Derivative assets 993  
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 203,392 274,866
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 318,957 266,799
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 1,190,271 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 99,982 147,654
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 9,117 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 37,003 222,377
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   9,173
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 486,408 383,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities 10,607 9,338
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Investment securities available-for-sale    
Available-for-sale investment securities 0 0
Derivative    
Derivative assets 679 0
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) | Interest rate swaps on certificates of deposit    
Derivative    
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 679  
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
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 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements    
Investment securities available-for-sale    
Available-for-sale investment securities 3,016,752 3,335,795
Derivative    
Derivative assets 66,146 83,780
Derivative liabilities (74,935) (82,323)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign currency forward contracts    
Derivative    
Derivative assets   4,325
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps on certificates of deposit    
Derivative    
Derivative liabilities (6,799) (5,976)
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and options    
Derivative    
Derivative assets 58,633 67,578
Derivative liabilities (57,958) (65,131)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts    
Derivative    
Derivative assets 5,840 11,874
Derivative liabilities (10,170) (11,213)
Fair Value, Measurements, Recurring | Fair Value Measurements | Credit risk participation agreements (“RPAs”)    
Derivative    
Derivative assets 1 3
Derivative liabilities (8) (3)
Fair Value, Measurements, Recurring | Fair Value Measurements | Warrants    
Derivative    
Derivative assets 1,672  
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities    
Investment securities available-for-sale    
Available-for-sale investment securities 640,280 720,479
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 203,392 274,866
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 318,957 266,799
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 1,190,271 1,258,747
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities    
Investment securities available-for-sale    
Available-for-sale investment securities 99,982 147,654
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 9,117 11,477
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 37,003 222,377
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Non-investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities   9,173
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign bonds | Investment grade    
Investment securities available-for-sale    
Available-for-sale investment securities 486,408 383,894
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities    
Investment securities available-for-sale    
Available-for-sale investment securities $ 31,342 $ 40,329