Securities Available-for-Sale (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Composition of Securities Available-for-Sale

The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:

	December 31, 2015									December 31, 2014
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,914	$	27	$	—		$	14,941	$	14,873	$	7	$	—		$	14,880
Obligations of U.S. government corporations and agencies	262,045		1,825		(567		)	263,303		268,029		2,334		(1,078		)	269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	128,458		693		(316		)	128,835		116,897		1,257		(148		)	118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	39,185		1,091		(151		)	40,125		45,274		1,548		(154		)	46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	69,697		183		(676		)	69,204		39,834		232		(393		)	39,673
Obligations of states and political subdivisions	128,904		5,988		(6		)	134,886		136,977		5,789		(64		)	142,702
Debt Securities	643,203		9,807		(1,716		)	651,294		621,884		11,167		(1,837		)	631,214
Marketable equity securities	7,579		2,090		—			9,669		7,579		1,480		—			9,059
Total	$	650,782	$	11,897	$	(1,716	)	$	660,963	$	629,463	$	12,647	$	(1,837	)	$	640,273

Schedule of Gross and Net Realized Gains and Losses on Sale of Securities

The following table shows the composition of gross and net realized gains and losses for the periods presented:

	Years ended December 31,
(dollars in thousands)	2015			2014		2013
Gross realized gains	$	—		$	41	$	5
Gross realized losses	(34		)	—		—
Net Realized (Losses) Gains	$	(34	)	$	41	$	5

Fair Value and Age of Gross Unrealized Losses by Investment Category

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

	December 31, 2015
	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			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	10	$	88,584	$	(379	)	2	$	14,542	$	(188	)	12	$	103,126	$	(567	)
Collateralized mortgage obligations of U.S. government corporations and agencies	6	61,211		(316		)	—	—		—			6	61,211		(316		)
Residential mortgage-backed securities of U.S. government corporations and agencies	1	7,993		(151		)	—	—		—			1	7,993		(151		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	5	50,839		(450		)	1	9,472		(226		)	6	60,311		(676		)
Obligations of states and political subdivisions	1	5,370		(6		)	—	—		—			1	5,370		(6		)
Total Temporarily Impaired Securities	23	$	213,997	$	(1,302	)	3	$	24,014	$	(414	)	26	$	238,011	$	(1,716	)

	December 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			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	39,745	$	(207	)	8	$	63,149	$	(871	)	12	$	102,894	$	(1,078	)
Collateralized mortgage obligations of U.S. government corporations and agencies	1	9,323		(148		)	—	—		—			1	9,323		(148		)
Residential mortgage-backed securities of U.S. government corporations and agencies	—	—		—			1	8,982		(154		)	1	8,982		(154		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	1	9,998		(25		)	2	20,640		(368		)	3	30,638		(393		)
Obligations of states and political subdivisions	1	263		(1		)	2	10,756		(63		)	3	11,019		(64		)
Total Temporarily Impaired Securities	7	$	59,329	$	(381	)	13	$	103,527	$	(1,456	)	20	$	162,856	$	(1,837	)

Unrealized Gain (Loss) on Investments

The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive income/(loss) for the periods presented:

	December 31, 2015							December 31, 2014
(dollars in thousands)	Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains (Losses)		Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains (Losses)
Total unrealized gains (losses) on securities available for sale	$	11,897	$	(1,716	)	$	10,181	$	12,647	$	(1,837	)	$	10,810
Income tax expense (benefit)	4,164		(601		)	3,563		4,426		(643		)	3,783
Net unrealized gains (losses), net of tax included in accumulated other comprehensive income(loss)	$	7,733	$	(1,115	)	$	6,618	$	8,221	$	(1,194	)	$	7,027

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

The amortized cost and fair value of securities available-for-sale at December 31, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	December 31, 2015
(dollars in thousands)	Amortized Cost		Fair Value
Due in one year or less	$	46,329	$	46,510
Due after one year through five years	222,838		224,334
Due after five years through ten years	56,934		58,793
Due after ten years	79,762		83,493
	405,863		413,130
Collateralized mortgage obligations of U.S. government corporations and agencies	128,458		128,835
Residential mortgage-backed securities of U.S. government corporations and agencies	39,185		40,125
Commercial mortgage-backed securities of U.S. government corporations and agencies	69,697		69,204
Debt Securities	643,203		651,294
Marketable equity securities	7,579		9,669
Total	$	650,782	$	660,963