Investment Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investment Securities [Abstract]

Amortized cost and estimated fair values of investments in debt and equity securities

	March 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities Available-for-Sale	(in thousands)
Obligations of U.S. government corporations and agencies	$	126,912	$	7,052		—	$	133,964
Obligations of states and political subdivisions		8,315		263		—		8,578
Corporate debt securities		1,866		46		—		1,912
Total securities available-for-sale	$	137,093	$	7,361		—	$	144,454
	December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities Available-for-Sale	(in thousands)
Obligations of U.S. government corporations and agencies	$	143,633	$	8,068		—	$	151,701
Obligations of states and political subdivisions		9,098		323		—		9,421
Corporate debt securities		1,862		43		—		1,905
Total securities available-for-sale	$	154,593	$	8,434		—	$	163,027

Amortized cost and estimated fair value of debt securities by contractual maturity

	Amortized Cost		Estimated Fair Value
Investment Securities	(in thousands)
Due in one year	$	2,692	$	2,766
Due after one year through five years		4,637		4,872
Due after five years through ten years		43,900		45,569
Due after ten years		85,864		91,247
Totals	$	137,093	$	144,454