Investments in Securities (Tables)

6 Months Ended

Jun. 30, 2012

Investments in Securities [Abstract]

Amortized cost and fair values of held-to-maturity securities

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Held-to-maturity securities:
June 30, 2012 (unaudited):
U.S. government sponsored enterprise mortgage-backed securities	$	50,939	$	1,576	$	—	$	52,515
Corporate debt securities		24,122		441		1		24,562
	$	75,061	$	2,017	$	1	$	77,077
December 31, 2011:
U.S. government and federal agency obligations	$	5,600	$	59	$	—	$	5,659
U.S. government sponsored enterprise mortgage-backed securities		46,432		1,168		97		47,503
Corporate debt securities		37,359		600		25		37,934
	$	89,391	$	1,827	$	122	$	91,096

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

	June 30, 2012				December 31, 2011
	Held-to-Maturity				Held-to-Maturity
	Amortized Cost Basis		Fair Value		Amortized Cost Basis		Fair Value
	(unaudited)
Due within one year	$	14,074	$	14,211	$	25,741	$	25,915
Due after one year through five years		10,048		10,351		17,218		17,678
U.S. government sponsored enterprise mortgage-backed securities		50,939		52,515		46,432		47,503
	$	75,061	$	77,077	$	89,391	$	91,096

Securities with gross unrealized losses aggregated by investment category and length of time

	Less than 12 Months				Over 12 Months
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
June 30, 2012 (unaudited):
Corporate debt securities	$	1,039	$	1	$	—	$	—
Total temporarily impaired securities	$	1,039	$	1	$	—	$	—
December 31, 2011:
U.S. government sponsored mortgage-backed securities	$	6,799	$	48	$	965	$	49
Corporate debt securities		7,039		25		—		—
Total temporarily impaired securities	$	13,838	$	73	$	965	$	49