Investment Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of investment securities available-for-sale

The following table shows investment securities available-for-sale.



(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2016
U.S. Treasury and Federal agencies securities	$	396,740	$	3,396	$	(5	)	$	400,131
U.S. States and political subdivisions securities	125,917		3,364		(63		)	129,218
Mortgage-backed securities — Federal agencies	239,829		4,982		(272		)	244,539
Corporate debt securities	32,032		398		—			32,430
Foreign government and other securities	800		10		—			810
Total debt securities	795,318		12,150		(340		)	807,128
Marketable equity securities	1,599		5,533		(2		)	7,130
Total investment securities available-for-sale	$	796,917	$	17,683	$	(342	)	$	814,258

December 31, 2015
U.S. Treasury and Federal agencies securities	$	389,457	$	1,718	$	(1,506	)	$	389,669
U.S. States and political subdivisions securities	120,441		2,692		(143		)	122,990
Mortgage-backed securities — Federal agencies	234,400		3,430		(1,533		)	236,297
Corporate debt securities	34,241		199		(57		)	34,383
Foreign government and other securities	800		10		(1		)	809
Total debt securities	779,339		8,049		(3,240		)	784,148
Marketable equity securities	1,893		5,906		(220		)	7,579
Total investment securities available-for-sale	$	781,232	$	13,955	$	(3,460	)	$	791,727

Schedule of contractual maturities of investments in debt securities available-for-sale

The following table shows the contractual maturities of investments in debt securities available-for-sale at June 30, 2016. Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.



(Dollars in thousands)	Amortized Cost		Fair Value
Due in one year or less	$	214,503	$	215,323
Due after one year through five years	318,873		324,549
Due after five years through ten years	22,113		22,717
Due after ten years	—		—
Mortgage-backed securities	239,829		244,539
Total debt securities available-for-sale	$	795,318	$	807,128

Schedule of gross unrealized losses and fair value by investment category and age

The following table summarizes gross unrealized losses and fair value by investment category and age.



	Less than 12 Months					12 months or Longer					Total
(Dollars in thousands)	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
June 30, 2016
U.S. Treasury and Federal agencies securities	$	5,974	$	(5	)	$	—	$	—		$	5,974	$	(5	)
U.S. States and political subdivisions securities	7,237		(22		)	4,474		(41		)	11,711		(63		)
Mortgage-backed securities - Federal agencies	23,770		(78		)	15,147		(194		)	38,917		(272		)
Corporate debt securities	—		—			—		—			—		—
Foreign government and other securities	—		—			—		—			—		—
Total debt securities	36,981		(105		)	19,621		(235		)	56,602		(340		)
Marketable equity securities	1		—			3		(2		)	4		(2		)
Total investment securities available-for-sale	$	36,982	$	(105	)	$	19,624	$	(237	)	$	56,606	$	(342	)

December 31, 2015
U.S. Treasury and Federal agencies securities	$	151,581	$	(928	)	$	43,372	$	(578	)	$	194,953	$	(1,506	)
U.S. States and political subdivisions securities	17,040		(79		)	3,795		(64		)	20,835		(143		)
Mortgage-backed securities - Federal agencies	78,731		(777		)	20,592		(756		)	99,323		(1,533		)
Corporate debt securities	9,340		(57		)	—		—			9,340		(57		)
Foreign government and other securities	99		(1		)	—		—			99		(1		)
Total debt securities	256,791		(1,842		)	67,759		(1,398		)	324,550		(3,240		)
Marketable equity securities	427		(218		)	3		(2		)	430		(220		)
Total investment securities available-for-sale	$	257,218	$	(2,060	)	$	67,762	$	(1,400	)	$	324,980	$	(3,460	)

Schedule of gross realized gains and losses from securities available-for-sale portfolio

The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses of all securities are computed using the specific identification cost basis.



	Three Months Ended June 30,					Six Months Ended June 30,
(Dollars in thousands)	2016			2015		2016			2015
Gross realized gains	$	85		$	4	$	95		$	4
Gross realized losses	—			—		—			—
OTTI losses	(294		)	—		(294		)	—
Net realized (losses) gains	$	(209	)	$	4	$	(199	)	$	4