Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial assets
Cash and due from banks	$ 333,000	$ 374,921
Interest-bearing deposits in other financial institutions	131,680	79,764
Federal funds sold and securities purchased under agreements to resell	13,200	19,000
Investment securities held to maturity	1,236,140	1,168,230
Investment securities held to maturity, fair value	1,278,855	1,184,442
Investment securities available for sale	4,801,766	4,967,414
FHLB and Federal Reserve Bank stocks	194,501	147,240
Loans held for sale	284,376	124,915
Loans, net	19,547,506	18,440,079
Derivatives (trading and other assets)	77,112	32,192
Financial liabilities
Short-term funding	1,911,557	834,416
Long-term funding	3,511,475	2,676,164
Derivatives (trading and other liabilities)	79,466	33,430
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks	333,000	374,921
Cash and due from banks, Fair Value	333,000	374,921
Interest-bearing deposits in other financial institutions	131,680	79,764
Interest-bearing deposits in other financial institutions, fair value	131,680	79,764
Federal funds sold and securities purchased under agreements to resell	13,200	19,000
Federal funds sold and securities purchased under agreements to resell, fair value	13,200	19,000
Investment securities available for sale	2,610	2,566
Investment securities available for sale, at fair value	2,610	2,566
Fair Value, Inputs, Level 2 [Member]
Financial assets
Investment securities held to maturity	1,236,140	1,168,230
Investment securities held to maturity, fair value	1,278,855	1,184,442
Investment securities available for sale	4,798,956	4,964,648
Investment securities available for sale, at fair value	4,798,956	4,964,648
FHLB and Federal Reserve Bank stocks	194,501	147,240
Federal Home Loan Bank and Federal Reserve Bank stocks, fair value	194,501	147,240
Loans held for sale	284,376	124,915
Loans held for sale, fair value	289,748	124,915
Bank owned life insurance	582,580	583,019
Bank owned life insurance, fair value	582,580	583,019
Derivatives (trading and other assets)	79,448	34,907
Derivatives (trading and other assets), fair value	79,448	34,907
Financial liabilities
Brokered CDs and other time deposits	1,564,032	1,562,802
Brokered CDs and other time deposits, fair value	1,574,368	1,564,464
Short-term funding	1,911,557	834,416
Short-term funding, fair value	1,911,557	834,416
Long-term funding	3,511,475	2,676,164
Long-term funding, fair value	3,579,398	2,728,112
Standby letters of credit	2,759	2,954
Standby letters of credit, fair value	2,759	2,954
Derivatives (trading and other liabilities)	81,802	36,145
Derivatives (trading and other liabilities), fair value	81,802	36,145
Fair Value, Inputs, Level 3 [Member]
Financial assets
Investment securities available for sale	200	200
Investment securities available for sale, at fair value	200	200
Loans, net	19,547,506	18,440,079
Loans, net, fair value	19,603,484	18,389,832
Derivatives (trading and other assets)	4,270	1,361
Derivatives (trading and other assets), fair value	4,270	1,361
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	18,728,818	19,444,863
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	18,728,818	19,444,863
Derivatives (trading and other liabilities)	4,205	0
Derivatives (trading and other liabilities), fair value	$ 4,205	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

No definition available.