Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis

	Fair Value Measurements at Reporting Date Using
				(in thousands)
		Assets/Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
		June 30, 2011		(Level 1)		(Level 2)		(Level 3)
Measured on a recurring basis:
Assets:
U.S. Treasury securities
Available-for-sale		$	828	$	—	$	828	$	—
Residential mortgage-backed securities
Available-for-sale		4,843,601		—		4,801,913		41,688
States and political subdivisions
Available-for-sale		208,458		—		208,458		—
Other
Available-for-sale		14,761		14,761		—		—

			Fair Value Measurements at Reporting Date Using
			(in thousands)
	Assets/Liabilities Measured at Fair Value		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2010		(Level 1)		(Level 2)		(Level 3)
Measured on a recurring basis:
Assets:
U.S. Treasury securities
Available-for-sale	$	1,327	$	—	$	1,327	$	—
Residential mortgage-backed securities
Available-for-sale	4,924,468		—		4,878,440		46,028
States and political subdivisions
Available-for-sale	145,997		—		145,997		—
Other
Available-for-sale	14,665		14,665		—		—

Reconciliation of activity for mortgage-backed securities on a net basis

Balance at December 31, 2010	$	46,028
Principal paydowns, net of discount amortization	(3,285		)
Total unrealized gains (losses) included in:
Other comprehensive income	(640		)
Net income	(415		)
Balance at June 30, 2011	$	41,688

Assets measured at fair value on a non-recurring basis

			Fair Value Measurements at Reporting Date Using
			(in thousands)
			Quoted
	Assets/Liabilities		Prices in
	Measured at Fair		Active		Significant
	Value		Markets for		Other		Significant
	Six months		Identical		Observable		Unobservable		Provision
	ended		Assets		Inputs		Inputs		During
	June 30, 2011		(Level 1)		(Level 2)		(Level 3)		Period
Measured on a non-recurring basis:
Assets:
Impaired loans	$	25,855	$	—	$	—	$	25,855	$	814
Other real estate owned	31,042		—		—		31,042		7,633

			Fair Value Measurements at Reporting Date Using
			(in thousands)
			Quoted
	Assets/Liabilities		Prices in
	Measured at Fair		Active		Significant
	Value		Markets for		Other		Significant
	Year ended		Identical		Observable		Unobservable		Provision
	December 31,		Assets		Inputs		Inputs		During
	2010		(Level 1)		(Level 2)		(Level 3)		Period
Measured on a non-recurring basis:
Assets:
Impaired loans	$	24,034	$	—	$	—	$	24,034	$	(114	)
Other real estate owned	52,319		—		—		52,319		719