Investment Securities (Tables)

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale

The amortized cost and estimated fair value of investment securities available for sale at September 30, 2013, December 31, 2012 and September 30, 2012 are presented below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(Dollars in Thousands)
September 30, 2013:
U. S. government agencies	$	14,945	$	—	$	(1,028	)	$	13,917
State, county and municipal securities		112,643		2,331		(2,035	)		112,939
Corporate debt securities		10,314		280		(856	)		9,738
Mortgage-backed securities		176,818		2,714		(3,878	)		175,654
Total securities	$	314,720	$	5,325	$	(7,797	)	$	312,248
December 31, 2012:
U. S. government agencies	$	6,605	$	271	$	(6	)	$	6,870
State, county and municipal securities		109,736		4,864		(210	)		114,390
Corporate debt securities		10,545		330		(547	)		10,328
Mortgage-backed securities		209,824		5,701		(204	)		215,321
Total securities	$	336,710	$	11,166	$	(967	)	$	346,909
September 30, 2012:
U. S. government agencies	$	8,606	$	289	$	—		$	8,895
State, county and municipal securities		106,541		5,345		(144	)		111,742
Corporate debt securities		11,793		262		(560	)		11,495
Mortgage-backed securities		222,641		6,562		(284	)		228,919
Total securities	$	349,581	$	12,458	$	(988	)	$	361,051

Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity

The amortized cost and fair value of available-for-sale securities at September 30, 2013 by contractual maturity are summarized in the table below. Expected maturities for mortgage-backed securities may differ from contractual maturities because in certain cases borrowers can prepay obligations without prepayment penalties. Therefore, these securities are not included in the following maturity summary:

	Amortized Cost		Fair Value
	(Dollars in Thousands)
Due in one year or less	$	2,214	$	2,229
Due from one year to five years		36,699		37,826
Due from five to ten years		68,790		67,622
Due after ten years		30,199		28,917
Mortgage-backed securities		176,818		175,654
	$	314,720	$	312,248

Schedule of Gross Unrealized Losses and Fair Value of Securities

The following table details the gross unrealized losses and fair value of securities aggregated by category and duration of continuous unrealized loss position at September 30, 2013, December 31, 2012 and September 30, 2012.

	Less Than 12 Months					12 Months or More					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(Dollars in Thousands)
September 30, 2013:
U. S. government agencies	$	13,917	$	(1,028	)	$	—	$	—		$	13,917	$	(1,028	)
State, county and municipal securities		46,516		(1,735	)		3,807		(300	)		50,323		(2,035	)
Corporate debt securities		—		—			4,235		(856	)		4,235		(856	)
Mortgage-backed securities		90,639		(3,878	)		—		—			90,639		(3,878	)
Total temporarily impaired securities	$	151,072	$	(6,641	)	$	8,042	$	(1,156	)	$	159,114	$	(7,797	)
December 31, 2012:
U. S. government agencies	$	4,994	$	(6	)	$	—	$	—		$	4,994	$	(6	)
State, county and municipal securities		15,595		(199	)		505		(11	)		16,100		(210	)
Corporate debt securities		—		—			4,560		(547	)		4,560		(547	)
Mortgage-backed securities		23,951		(181	)		3,617		(23	)		27,568		(204	)
Total temporarily impaired securities	$	44,540	$	(386	)	$	8,682	$	(581	)	$	53,222	$	(967	)
September 30, 2012:
U. S. government agencies	$	—	$	—		$	—	$	—		$	—	$	—
State, county and municipal securities		14,653		(132	)		505		(12	)		15,158		(144	)
Corporate debt securities		—		—			5,551		(560	)		5,551		(560	)
Mortgage-backed securities		32,660		(267	)		3,434		(17	)		36,094		(284	)
Total temporarily impaired securities	$	47,313	$	(399	)	$	9,490	$	(589	)	$	56,803	$	(988	)