Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)

	Investment Securities Available for Sale			Derivative Financial Instruments
($ in Thousands)
Balance December 31, 2013	$	299		$	1,717
Total net losses included in income:
Mortgage derivative loss	—			(2,205		)
Sales of investment securities	(99		)	—
Balance December 31, 2014	$	200		$	(488	)
Total net gains included in income:
Mortgage derivative gain	—			1,090
Balance September 30, 2015	$	200		$	602

Assets and Liabilities Measured on Nonrecurring Basis at Fair Value

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
			Fair Value Measurements Using
	September 30, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	106,276	$	—	$	106,276	$	—
Impaired loans (1)	72,661		—		—		72,661
Mortgage servicing rights	67,794		—		—		67,794
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	156,423	$	—	$	156,423	$	—
Impaired loans (1)	83,956		—		—		83,956
Mortgage servicing rights	66,342		—		—		66,342

(1) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

Estimated fair values of financial instruments

	September 30, 2015
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	303,701	$	303,701	$	303,701	$	—	$	—
Interest-bearing deposits in other financial institutions	70,023		70,023		70,023		—		—
Federal funds sold and securities purchased under agreements to resell	36,490		36,490		36,490		—		—
Investment securities held to maturity	604,799		613,372		—		613,372		—
Investment securities available for sale	5,403,656		5,403,656		4,505		5,398,951		200
FHLB and Federal Reserve Bank stocks	160,871		160,871		—		160,871		—
Loans held for sale	105,144		106,276		—		106,276		—
Loans, net	18,262,237		18,435,809		—		—		18,435,809
Bank owned life insurance	580,289		580,289		—		580,289		—
Accrued interest receivable	70,977		70,977		70,977		—		—
Interest rate-related instruments	42,593		42,593		—		42,593		—
Foreign currency exchange forwards	1,159		1,159		—		1,159		—
Interest rate lock commitments to originate residential mortgage loans held for sale	2,584		2,584		—		—		2,584
Purchased options (time deposit)	2,915		2,915		—		2,915		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	18,936,600	$	18,936,600	$	—	$	—	$	18,936,600
Brokered CDs and other time deposits	1,621,795		1,632,811		—		1,632,811		—
Short-term funding	1,022,335		1,022,335		—		1,022,335		—
Long-term funding	2,679,542		2,740,335		—		2,740,335		—
Accrued interest payable	6,888		6,888		6,888		—		—
Interest rate-related instruments	44,857		44,857		—		44,857		—
Foreign currency exchange forwards	960		960		—		960		—
Forward commitments to sell residential mortgage loans	1,982		1,982		—		—		1,982
Standby letters of credit (1)	3,164		3,164		—		3,164		—
Written options (time deposit)	2,915		2,915		—		2,915		—

	December 31, 2014
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	444,113	$	444,113	$	444,113	$	—	$	—
Interest-bearing deposits in other financial institutions	571,924		571,924		571,924		—		—
Federal funds sold and securities purchased under agreements to resell	16,030		16,030		16,030		—		—
Investment securities held to maturity	404,455		413,067		—		413,067		—
Investment securities available for sale	5,396,812		5,396,812		3,957		5,392,655		200
FHLB and Federal Reserve Bank stocks	189,107		189,107		—		189,107		—
Loans held for sale	154,935		156,423		—		156,423		—
Loans, net	17,327,544		17,427,647		—		—		17,427,647
Bank owned life insurance	574,154		574,154		—		574,154		—
Accrued interest receivable	67,573		67,573		67,573		—		—
Interest rate-related instruments	33,023		33,023		—		33,023		—
Foreign currency exchange forwards	2,140		2,140		—		2,140		—
Interest rate lock commitments to originate residential mortgage loans held for sale	1,947		1,947		—		—		1,947
Purchased options (time deposit)	6,054		6,054		—		6,054		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	17,192,049	$	17,192,049	$	—	$	—	$	17,192,049
Brokered CDs and other time deposits	1,571,455		1,571,455		—		1,571,455		—
Short-term funding	1,068,288		1,068,288		—		1,068,288		—
Long-term funding	3,930,117		3,975,605		—		3,975,605		—
Accrued interest payable	9,530		9,530		9,530		—		—
Interest rate-related instruments	35,372		35,372		—		35,372		—
Foreign currency exchange forwards	1,957		1,957		—		1,957		—
Standby letters of credit (1)	3,542		3,542		—		3,542		—
Forward commitments to sell residential mortgage loans	2,435		2,435		—		—		2,435
Written options (time deposit)	6,054		6,054		—		6,054		—

(1) The commitment on standby letters of credit was $317 million and $353 million at September 30, 2015 and December 31, 2014, respectively. See Note 13 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Fair Value, Measurements, Recurring [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets and Liabilities Measured on Recurring Basis at Fair Value

Assets and Liabilities Measured at Fair Value on a Recurring Basis
			Fair Value Measurements Using
	September 30, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	1,002	$	1,002	$	—	$	—
Municipal securities	427,701		—		427,701		—
Residential mortgage-related securities:
Government-sponsored enterprise (GSE)	3,088,923		—		3,088,923		—
Private-label	1,746		—		1,746		—
GSE commercial mortgage-related securities	1,877,581		—		1,877,581		—
Other securities (debt and equity)	6,703		3,503		3,000		200
Total investment securities available for sale	$	5,403,656	$	4,505	$	5,398,951	$	200
Derivatives (trading and other assets)	$	49,251	$	—	$	46,667	$	2,584
Liabilities:
Derivatives (trading and other liabilities)	$	50,714	$	—	$	48,732	$	1,982
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	998	$	998	$	—	$	—
Municipal securities	582,679		—		582,679		—
Residential mortgage-related securities:
GSE	3,730,789		—		3,730,789		—
Private-label	2,294		—		2,294		—
GSE commercial mortgage-related securities	1,073,893		—		1,073,893		—
Other securities (debt and equity)	6,159		2,959		3,000		200
Total investment securities available for sale	$	5,396,812	$	3,957	$	5,392,655	$	200
Derivatives (trading and other assets)	$	43,164	$	—	$	41,217	$	1,947
Liabilities:
Derivatives (trading and other liabilities)	$	45,818	$	—	$	43,383	$	2,435