Investment Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost and Approximate Fair Values of Investment Securities Available for Sale

Amortized cost and approximate fair values of investment securities available for sale are summarized as follows:

					Gross Unrealized Losses
					Less			12
			Gross		Than			Months
	Amortized		Unrealized		12			or			Fair
(in thousands)	Cost		Gains		Months			Longer			Value
As of June 30, 2016
U.S. Government-sponsored securities	$	79,713	$	188	$	(6	)	$	—		$	79,895
Municipal securities		30,384		844		-			—			31,228
Mortgage-backed securities		10,000		-		(251	)		(91	)		9,658
Corporate securities		158,236		2,089		(59	)		(342	)		159,924
	$	278,333	$	3,121	$	(316	)	$	(433	)	$	280,705
As of December 31, 2015
U.S. Government-sponsored securities	$	104,591	$	11	$	(612	)	$	-		$	103,990
Municipal securities		36,820		926		(7	)		(9	)		37,730
Mortgage-backed securities		181,857		940		(724	)		(687	)		181,386
Corporate securities		10,000		-		(253	)		(117	)		9,630
	$	333,268	$	1,877	$	(1,596	)	$	(813	)	$	332,736

Summary of Carrying Amounts and Estimated Fair Values of Securities Held-to-Maturity

Carrying amounts and estimated fair values of securities held-to-maturity are as follows:

					Gross Unrealized Losses
					Less			12
			Gross		Than			Months
	Amortized		Unrealized		12			or			Fair
(in thousands)	Cost		Gains		Months			Longer			Value
As of June 30, 2016
Municipal securities	$	59,205	$	623	$	(9	)	$	(5	)	$	59,814
Certificates of deposit		2,232		4		—			—			2,236
	$	61,437	$	627	$	(9	)	$	(5	)	$	62,050
As of December 31, 2015
Municipal securities	$	63,650	$	238	$	(74	)	$	(2	)	$	63,812
Certificates of deposit		2,232		5		-			—			2,237
	$	65,882	$	243	$	(74	)	$	(2	)	$	66,049

Amortized Cost and Estimated Fair Values of Investment Securities that are Available-for-Sale and Held-to-Maturity by Contractual Maturity

The amortized cost and estimated fair values of investment securities that are available-for-sale and held-to-maturity at June 30, 2016, by contractual maturity, are as follows:

	Available-for-sale				Held-to-maturity
	Amortized		Fair		Amortized		Fair
(in thousands)	Cost		Value		Cost		Value
Securities maturing in:
One year or less	$	16,591	$	16,680	$	10,513	$	10,528
After one year through five years		92,971		93,642		39,643		40,003
After five years through ten years		58,193		58,756		11,281		11,519
After ten years		110,578		111,627		—		—
	$	278,333	$	280,705	$	61,437	$	62,050