Mortgage-Backed Securities Available for Sale (Tables)

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Market Value of Mortgage-Backed Securities Available for Sale

The amortized cost and estimated market value of mortgage-backed securities available for sale at June 30, 2013 and December 31, 2012 are as follows (in thousands):

June 30, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Market Value
FHLMC	$	162,588	$	623	$	(2,354	)	$	160,857
FNMA		227,718		5,230		(2,175	)		230,773
GNMA		771		174		—			945
	$	391,077	$	6,027	$	(4,529	)	$	392,575

December 31, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Market Value
FHLMC	$	118,294	$	1,284	$	(53	)	$	119,525
FNMA		204,296		9,017		(11	)		213,302
GNMA		824		206		—			1,030
	$	323,414	$	10,507	$	(64	)	$	333,857

Estimated Market Value and Unrealized Loss for Mortgage-Backed Securities Available for Sale

The estimated market value and unrealized loss for mortgage-backed securities available for sale at June 30, 2013 and December 31, 2012, segregated by the duration of the unrealized loss are as follows (in thousands):

	Less than 12 months					12 months or longer					Total
June 30, 2013	Estimated Market Value		Unrealized Losses			Estimated Market Value		Unrealized Losses			Estimated Market Value		Unrealized Losses
FHLMC	$	125,115	$	(2,352	)	$	3,222	$	(2	)	$	128,337	$	(2,354	)
FNMA		78,980		(2,175	)		—		—			78,980		(2,175	)
	$	204,095	$	(4,527	)	$	3,222	$	(2	)	$	207,317	$	(4,529	)
	Less than 12 months					12 months or longer					Total
December 31, 2012	Estimated Market Value		Unrealized Losses			Estimated Market Value		Unrealized Losses			Estimated Market Value		Unrealized Losses
FHLMC	$	16,186	$	(53	)	$	—	$	—		$	16,186	$	(53	)
FNMA		4,871		(11	)		—		—			4,871		(11	)
	$	21,057	$	(64	)	$	—	$	—		$	21,057	$	(64	)