Investment Securities (Tables)

6 Months Ended

Jun. 30, 2012

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The following table summarizes the amortized cost and estimated fair value of available-for-sale investment securities and presents the related gross unrealized gains and losses:

June 30, 2012
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Obligations of:
U.S. Treasury and government agencies	$	6,864	$	232	$	—	$	7,096
U.S. government sponsored enterprises	3,586		30		—		3,616
States and political subdivisions	5,988		78		—		6,066
Residential mortgage-backed securities-GSE	381,857		3,904		259		385,502
Residential mortgage-backed securities-Private	32,797		652		769		32,680
Commercial mortgage-backed securities-Private	5,354		—		15		5,339
Corporate notes	36,992		—		155		36,837
Total	$	473,438	$	4,896	$	1,198	$	477,136
December 31, 2011
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Obligations of:
U.S. Treasury and government agencies	$	7,081	$	107	$	—	$	7,188
U.S. government sponsored enterprises	32,479		36		151		32,364
States and political subdivisions	6,075		16		1		6,090
Residential mortgage-backed securities-GSE	348,884		2,611		1,222		350,273
Residential mortgage-backed securities-Private	33,111		73		967		32,217
Corporate notes	3,206		—		32		3,174
Total	$	430,836	$	2,843	$	2,373	$	431,306

Available-for-sale Securities, Continuous Unrealized Loss Position

The following tables show investments' estimated fair value and gross unrealized losses, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at June 30, 2012 and December 31, 2011. All unrealized losses on investment securities are considered by management to be temporary given the credit ratings on these investment securities or the short duration of the unrealized loss or both.

	Less than 12 Months				12 Months or More				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
June 30, 2012
Residential mortgage-backed securities-GSE	$	43,983	$	167	$	12,594	$	92	$	56,577	$	259
Residential mortgage-backed securities-Private	13,061		769		—		—		13,061		769
Commercial mortgage-backed securities-Private	5,339		15		—		—		5,339		15
Corporate notes	36,837		155		—		—		36,837		155
Total	$	99,220	$	1,106	$	12,594	$	92	$	111,814	$	1,198
	Less than 12 Months				12 Months or More				Total
(dollars in thousands)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
December 31, 2011
Obligations of:
U.S. government sponsored enterprises	$	21,248	$	151	$	—	$	—	$	21,248	$	151
States and political subdivisions	1,907		1		—		—		1,907		1
Residential mortgage-backed securities-GSE	89,730		1,042		16,552		180		106,282		1,222
Residential mortgage-backed securities-Private	21,519		967		—		—		21,519		967
Corporate notes	3,173		32		—		—		3,173		32
Total	$	137,577	$	2,193	$	16,552	$	180	$	154,129	$	2,373

Available-for-sale Securities, by Maturity Dates

The aggregate amortized cost and fair value of securities at June 30, 2012, by remaining contractual maturity, are shown in the following table. Actual expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.

	Available-for-Sale
(dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	8,436	$	8,407
Due after one one year through five years	33,381		33,459
Due after five years through 10 years	4,749		4,653
Due after 10 years	6,864		7,096
Total	53,430		53,615
Mortgage-backed securities	420,008		423,521
Total	$	473,438	$	477,136