Investment Securities Held-to-Maturity (Tables)

3 Months Ended

Mar. 31, 2013

Securities Available-for-Sale and Investment Securities Held-to-Maturity [Abstract]

Unrealized gain (losses) on securities

	March 31, 2013								December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
U.S. Government Sponsored Enterprises	$	17,746	$	20	$	—	$	17,766	$	17,747	$	19	$	8	$	17,758
U.S. Government Agency and Sponsored Enterprises Mortgage Backed Securities		242,799		5,655		173		248,281		257,760		6,480		74		264,166
Total	$	260,545	$	5,675	$	173	$	266,047	$	275,507	$	6,499	$	82	$	281,924

Company's securities held-to-maturity

The following table shows the maturity distribution of the Company’s securities held-to-maturity at March 31, 2013.

	Amortized Cost		Fair Value
	( In thousands)
Within one year	$	4,310	$	4,361
After one but within five years		205,007		209,438
After five but within ten years		50,956		51,967
More than ten years		272		281
Total	$	260,545	$	266,047

Unrealized market loss of securities

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at March 31, 2013.

	March 31, 2013
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(Dollars in thousands)
U.S. Government Sponsored Enterprises	$	—	$	—	$	—	$	—	$	—	$	—
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		13,299		127		5,419		46		18,718		173
Total temporarily impaired securities	$	13,299	$	127	$	5,419	$	46	$	18,718	$	173

The following table shows the temporarily impaired securities of the Company’s held-to-maturity portfolio at December 31, 2012.

	December 31, 2012
	Less Than 12 Months				12 Months or Longer				Total
Temporarily Impaired Investments	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	( In thousands)
U.S. Government Sponsored Enterprises	$	9,994	$	8	$	—	$	—	$	9,994	$	8
U.S. Government Agency and Sponsored Enterprise Mortgage-Backed Securities		8,936		50		5,371		24		14,307		74
Total temporarily impaired securities	$	18,930	$	58	$	5,371	$	24	$	24,301	$	82