Securities Available-for-Sale (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Composition of Securities Available-for-Sale

The following table indicates the composition of the securities available-for-sale portfolio as of the dates presented:

	March 31, 2014									December 31, 2013
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Obligations of U.S. government corporations and agencies	$	264,291	$	2,109	$	(2,216	)	$	264,184	$	235,181	$	2,151	$	(2,581	)	$	234,751
Collateralized mortgage obligations of U.S. government corporations and agencies	62,114		693		(368		)	62,439		63,776		601		(603		)	63,774
Residential mortgage-backed securities of U.S. government corporations and agencies	46,519		1,424		(391		)	47,552		47,934		1,420		(685		)	48,669
Commercial mortgage-backed securities of U.S. government corporations and agencies	40,227		13		(919		)	39,321		40,357		—		(1,305		)	39,052
Obligations of states and political subdivisions	127,665		2,481		(949		)	129,197		115,572		1,294		(2,602		)	114,264
Debt Securities	540,816		6,720		(4,843		)	542,693		502,820		5,466		(7,776		)	500,510
Marketable equity securities	7,579		1,624		—			9,203		7,579		1,336		—			8,915
Total	$	548,395	$	8,344	$	(4,843	)	$	551,896	$	510,399	$	6,802	$	(7,776	)	$	509,425

Fair Value and Age of Gross Unrealized Losses by Investment Category

The following tables indicate the fair value and the age of gross unrealized losses by investment category as of the dates presented:

	March 31, 2014
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses
Obligations of U.S. government corporations and agencies	19	$	171,730	$	(2,216	)	—	$	—	$	—		$	171,730	19	$	(2,216	)
Collateralized mortgage obligations of U.S. government corporations and agencies	3	39,265		(368		)	—	—		—			39,265		3	(368		)
Residential mortgage-backed securities of U.S. government corporations and agencies	3	23,002		(391		)	—	—		—			23,002		3	(391		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	3	30,436		(919		)	—	—		—			30,436		3	(919		)
Obligations of states and political subdivisions	11	29,662		(401		)	2	10,370		(548		)	40,032		13	(949		)
Debt Securities	39	294,095		(4,295		)	2	10,370		(548		)	304,465		41	(4,843		)
Marketable equity securities	—	—		—			—	—		—			—		—	—
Total Temporarily Impaired Securities	39	$	294,095	$	(4,295	)	2	$	10,370	$	(548	)	$	304,465	41	$	(4,843	)
	December 31, 2013
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses
Obligations of U.S. government corporations and agencies	16	$	126,017	$	(2,581	)	—	$	—	$	—		$	126,017	16	$	(2,581	)
Collateralized mortgage obligations of U.S. government corporations and agencies	3	39,522		(603		)	—	—		—			39,522		3	(603		)
Residential mortgage-backed securities of U.S. government corporations and agencies	2	22,822		(685		)	—	—		—			22,822		2	(685		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	4	39,052		(1,305		)	—	—		—			39,052		4	(1,305		)
Obligations of states and political subdivisions	16	47,529		(1,739		)	2	10,088		(863		)	57,617		18	(2,602		)
Debt Securities	41	274,942		(6,913		)	2	10,088		(863		)	285,030		43	(7,776		)
Marketable equity securities	—	—		—			—	—		—			—		—	—
Total Temporarily Impaired Securities	41	$	274,942	$	(6,913	)	2	$	10,088	$	(863	)	$	285,030	43	$	(7,776	)

Amortized Cost and Fair Value of Available-for-Sale Securities

The amortized cost and fair value of securities available-for-sale at March 31, 2014, by contractual maturity, are included in the table below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	March 31, 2014
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	14,180	$	14,306
Due after one year through five years	183,013		183,694
Due after five years through ten years	103,528		103,277
Due after ten years	91,235		92,104
	391,956		393,381
Collateralized mortgage obligations of U.S. government corporations and agencies	62,114		62,439
Residential mortgage-backed securities of U.S. government corporations and agencies	46,519		47,552
Commercial Mortgage-backed securities of U.S. government corporations and agencies	40,227		39,321
Debt Securities	540,816		542,693
Marketable equity securities	7,579		9,203
Total	$	548,395	$	551,896