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Fair Value Measurement and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment securities available-for-sale
Available-for-sale investment securities	$ 2,822,725	$ 3,335,795
Derivative
Derivative assets	79,764	83,780
Derivative liabilities	(83,400)	(82,323)
U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	546,857	720,479
U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	173,585	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	325,144	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	1,128,531	1,258,747
Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	105,502	147,654
Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	10,210	11,477
Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	2,296	222,377
Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Available-for-sale investment securities	9,492	9,173
Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	479,687	383,894
Other securities
Investment securities available-for-sale
Available-for-sale investment securities	41,421	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	578,208	751,470
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	546,857	720,479
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	31,351	30,991
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Investment securities available-for-sale
Available-for-sale investment securities	2,244,517	2,584,325
Derivative
Derivative assets	79,764	83,780
Derivative liabilities	(83,400)	(82,323)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options
Derivative
Derivative assets	64,254	67,578
Derivative liabilities	(63,551)	(65,131)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Derivative
Derivative assets	14,722	11,874
Derivative liabilities	(13,161)	(11,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | RPAs
Derivative
Derivative assets	2	3
Derivative liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Warrants
Derivative
Derivative assets	786
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit
Derivative
Derivative liabilities	(6,686)	(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. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	173,585	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	325,144	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	1,128,531	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	105,502	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	10,210	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	2,296	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	9,492	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	479,687	383,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities
Investment securities available-for-sale
Available-for-sale investment securities	10,070	9,338
Fair Value, Measurements, Recurring | Estimated Fair Value
Investment securities available-for-sale
Available-for-sale investment securities	2,822,725	3,335,795
Derivative
Derivative assets	79,764	83,780
Derivative liabilities	(83,400)	(82,323)
Fair Value, Measurements, Recurring | Estimated Fair Value | Interest rate swaps and options
Derivative
Derivative assets	64,254	67,578
Derivative liabilities	(63,551)	(65,131)
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign exchange contracts
Derivative
Derivative assets	14,722	11,874
Derivative liabilities	(13,161)	(11,213)
Fair Value, Measurements, Recurring | Estimated Fair Value | RPAs
Derivative
Derivative assets	2	3
Derivative liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Estimated Fair Value | Warrants
Derivative
Derivative assets	786
Fair Value, Measurements, Recurring | Estimated Fair Value | Interest rate swaps on certificates of deposit
Derivative
Derivative liabilities	(6,686)	(5,976)
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign currency forward contracts
Derivative
Derivative assets		4,325
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	546,857	720,479
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	173,585	274,866
Fair Value, Measurements, Recurring | Estimated Fair Value | 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	325,144	266,799
Fair Value, Measurements, Recurring | Estimated Fair Value | 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	1,128,531	1,258,747
Fair Value, Measurements, Recurring | Estimated Fair Value | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	105,502	147,654
Fair Value, Measurements, Recurring | Estimated Fair Value | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	10,210	11,477
Fair Value, Measurements, Recurring | Estimated Fair Value | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	2,296	222,377
Fair Value, Measurements, Recurring | Estimated Fair Value | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Available-for-sale investment securities	9,492	9,173
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	479,687	383,894
Fair Value, Measurements, Recurring | Estimated Fair Value | Other securities
Investment securities available-for-sale
Available-for-sale investment securities	$ 41,421	$ 40,329

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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