Securities (Tables)

6 Months Ended

Jun. 30, 2012

Securities [Abstract]

Securities held for investment and securities available for sale

	June 30, 2012
	(Dollars in thousands)
Held for investment, at cost (market value: $20,104)	$	19,734
Available for sale, at market value		555,300
Total	$	575,034

Amortized cost and estimated market values of securities held for investment

	June 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
	(Dollars in thousands)
U.S. treasury and other Federal agencies	$	901	$	68	$	—	$	969
States and political subdivisions		18,833		302		—		19,135
Total	$	19,734	$	370	$	—	$	20,104

Amortized cost and estimated market values of securities available for sale

	June 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Market Value
	(Dollars in thousands)
U.S. Federal agencies (1)	$	455,175	$	4,512	$	(121	)	$	459,566
Mortgage backed securities		23,869		843		(3	)		24,709
States and political subdivisions		57,540		3,008		(10	)		60,538
Other securities (2)		8,011		2,498		(22	)		10,487
Total	$	544,595	$	10,861	$	(156	)	$	555,300

(1) Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.

(2) Primarily consists of equity securities.

Maturity of securities

	June 30, 2012
	Amortized Cost		Estimated Market Value
	(Dollars in thousands)
Held for Investment
Contractual maturity of debt securities:
Within one year	$	1,583	$	1,602
After one year but within five years		14,679		14,909
After five years but within ten years		2,830		2,889
After ten years		642		704
Total	$	19,734	$	20,104
Available for Sale
Contractual maturity of debt securities:
Within one year	$	85,373	$	86,441
After one year but within five years		323,771		326,413
After five years but within ten years		46,982		49,031
After ten years		80,458		82,928
Total debt securities		536,584		544,813
Equity securities		8,011		10,487
Total	$	544,595	$	555,300

Company's book value of pledged securities

	June 30, 2012
	(Dollars in thousands)
Book value of pledged securities	$	484,329