Investments (Tables)

6 Months Ended

Jun. 30, 2011

Investments [Abstract]

Investment Securities, Available-for-Sale

	June 30, 2011									December 31, 2010
			Gross		Gross							Gross		Gross
	Amortized		Unrealized		Unrealized			Fair		Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value		Cost		Gains		Losses			Value
	($ in thousands)
Agency callable notes	$	124,984	$	575	$	(569	)	$	124,990	$	164,219	$	418	$	(1,749	)	$	162,888
Agency debt		55,918		1,046		—			56,964		102,263		1,167		—			103,430
Agency discount notes		—		—		—			—		164,917		57		—			164,974
Agency MBS		1,110,767		23,456		(696	)		1,133,527		860,441		15,035		(5,321	)		870,155
Asset-backed securities		18,874		1,016		—			19,890		—		—		—			—
Collateralized loan obligation		10,285		10,161		—			20,446		12,249		—		—			12,249
Corporate debt		5,730		63		(15	)		5,778		5,013		122		—			5,135
Equity security		202		318		—			520		202		61		—			263
Municipal bond		3,235		—		—			3,235		—		—		—			—
Non-agency MBS		87,558		1,258		(1,203	)		87,613		112,917		1,640		(873	)		113,684
U.S. Treasury and agency securities		19,796		—		(16	)		19,780		90,587		24		(478	)		90,133
Total	$	1,437,349	$	37,893	$	(2,499	)	$	1,472,743	$	1,512,808	$	18,524	$	(8,421	)	$	1,522,911

Amortized costs and estimated fair values of investment securities, available-for-sale pledged as collateral

	June 30, 2011				December 31, 2010
Source	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	($ in thousands)
FHLB	$	764,161	$	781,921	$	877,766	$	889,888
FRB		19,942		18,843		35,056		34,256
Non-government Correspondent Bank(1)		39,992		39,992		37,979		37,989
Government Agency(2)		27,651		28,512		29,069		29,305
Total	$	851,746	$	869,268	$	979,870	$	991,438

Proceeds and gross pre-tax gains from sales of investment securities and available-for-sale

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
	($ in thousands)
Proceeds from sales	$	—	$	19,500	$	70,206	$	39,500
Gross pre-tax gains from sales		—		877		14,507		1,616

Amortized costs and estimated fair values of investment securities, held-to-maturity pledged as collateral

	June 30, 2011				December 31, 2010
Source	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	($ in thousands)
FHLB	$	12,178	$	13,175	$	21,260	$	22,431
FRB		113,018		118,109		143,927		153,756
Total	$	125,196	$	131,284	$	165,187	$	176,187

Unrealized Losses on Investment Securities

	Less Than 12 Months					12 Months or More					Total
	Gross					Gross					Gross
	Unrealized			Fair		Unrealized			Fair		Unrealized			Fair
	Losses			Value		Losses			Value		Losses			Value
	($ in thousands)
As of June 30, 2011
Investment securities, available-for-sale:
Agency callable notes	$	(569	)	$	29,415	$	—		$	—	$	(569	)	$	29,415
Agency MBS		(696	)		127,134		—			—		(696	)		127,134
Corporate debt		(15	)		—		—			—		(15	)		—
Non-agency MBS		(5	)		1,841		(1,198	)		22,175		(1,203	)		24,016
U.S. Treasury and agency securities		(16	)		19,780		—			—		(16	)		19,780
Total investment securities, available-for-sale	$	(1,301	)	$	178,170	$	(1,198	)	$	22,175	$	(2,499	)	$	200,345
Total investment securities, held-to-maturity(1)	$	(261	)	$	43,323	$	—		$	—	$	(261	)	$	43,323
As of December 31, 2010
Investment securities, available-for-sale:
Agency callable notes	$	(1,749	)	$	92,471	$	—		$	—	$	(1,749	)	$	92,471
Agency MBS		(5,321	)		252,844		—			—		(5,321	)		252,844
Non-agency MBS		(835	)		20,905		(38	)		8,384		(873	)		29,289
U.S. Treasury and agency securities		(478	)		20,151		—			—		(478	)		20,151
Total investment securities, available-for-sale	$	(8,383	)	$	386,371	$	(38	)	$	8,384	$	(8,421	)	$	394,755
Total investment securities, held-to-maturity(1)	$	(97	)	$	13,524	$	—		$	—	$	(97	)	$	13,524

Contractual maturities of available-for-sale and held-to-maturity investment securities

	Investment Securities,				Investment Securities,
	Available-for-Sale				Held-to-Maturity
			Estimated				Estimated
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
	($ in thousands)
Due in one year or less	$	25,024	$	25,177	$	—	$	—
Due after one year through five years		149,846		151,150		26,348		30,535
Due after five years through ten years(1)		86,010		89,458		—		—
Due after ten years(2)(3)		1,176,469		1,206,958		109,902		111,767
Total	$	1,437,349	$	1,472,743	$	136,250	$	142,302

Other Investments

	June 30,		December 31,
	2011		2010
	($ in thousands)
Investments carried at cost	$	32,826	$	33,062
Investments carried at fair value		210		222
Investments accounted for under the equity method		28,629		38,605
Total	$	61,665	$	71,889

Proceeds and net pre-tax gains from sales of other investments

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
	($ in thousands)
Proceeds from sales	$	9,923	$	16,048	$	20,020	$	25,472
Net pre-tax gains from sales		7,416		7,043		17,251		13,453