Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015
U.S. Treasury and Federal agencies securities	$	383,369	$	3,443	$	(898	)	$	385,914
U.S. States and political subdivisions securities	121,353		2,629		(274		)	123,708
Mortgage-backed securities — Federal agencies	232,454		4,369		(1,573		)	235,250
Corporate debt securities	33,326		271		(20		)	33,577
Foreign government and other securities	800		7		—			807
Total debt securities	771,302		10,719		(2,765		)	779,256
Marketable equity securities	1,893		5,408		(86		)	7,215
Total investment securities available-for-sale	$	773,195	$	16,127	$	(2,851	)	$	786,471
December 31, 2014
U.S. Treasury and Federal agencies securities	$	371,878	$	3,593	$	(1,968	)	$	373,503
U.S. States and political subdivisions securities	121,510		3,392		(214		)	124,688
Mortgage-backed securities — Federal agencies	248,299		5,490		(781		)	253,008
Corporate debt securities	31,677		281		(26		)	31,932
Foreign government and other securities	800		11		—			811
Total debt securities	774,164		12,767		(2,989		)	783,942
Marketable equity securities	1,893		5,285		(2		)	7,176
Total investment securities available-for-sale	$	776,057	$	18,052	$	(2,991	)	$	791,118

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

The following table shows the contractual maturities of investments in securities available-for-sale at June 30, 2015. 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	$	83,048	$	83,639
Due after one year through five years	429,898		434,308
Due after five years through ten years	25,902		26,059
Due after ten years	—		—
Mortgage-backed securities	232,454		235,250
Total debt securities available-for-sale	$	771,302	$	779,256

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

The following table shows the gross realized gains and losses on sale of securities from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses on the sales of all securities are computed using the specific identification cost basis. The gross gains for the six months ended June 30, 2014 reflect the sale of marketable equity securities.

	Three Months Ended   June 30,				Six Months Ended   June 30,
(Dollars in thousands)	2015		2014		2015		2014
Gross realized gains	$	4	$	—	$	4	$	963
Gross realized losses	—		—		—		—
Net realized gains (losses)	$	4	$	—	$	4	$	963

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, 2015
U.S. Treasury and Federal agencies securities	$	24,563	$	(72	)	$	104,158	$	(826	)	$	128,721	$	(898	)
U.S. States and political subdivisions securities	31,585		(241		)	2,068		(33		)	33,653		(274		)
Mortgage-backed securities - Federal agencies	62,521		(639		)	18,952		(934		)	81,473		(1,573		)
Corporate debt securities	3,833		(19		)	999		(1		)	4,832		(20		)
Foreign government and other securities	—		—			—		—			—		—
Total debt securities	122,502		(971		)	126,177		(1,794		)	248,679		(2,765		)
Marketable equity securities	560		(85		)	3		(1		)	563		(86		)
Total investment securities available-for-sale	$	123,062	$	(1,056	)	$	126,180	$	(1,795	)	$	249,242	$	(2,851	)
December 31, 2014
U.S. Treasury and Federal agencies securities	$	54,944	$	(148	)	$	115,195	$	(1,820	)	$	170,139	$	(1,968	)
U.S. States and political subdivisions securities	16,805		(112		)	8,333		(102		)	25,138		(214		)
Mortgage-backed securities - Federal agencies	21,754		(62		)	32,781		(719		)	54,535		(781		)
Corporate debt securities	3,072		(26		)	—		—			3,072		(26		)
Foreign government and other securities	—		—			—		—			—		—
Total debt securities	96,575		(348		)	156,309		(2,641		)	252,884		(2,989		)
Marketable equity securities	—		—			3		(2		)	3		(2		)
Total investment securities available-for-sale	$	96,575	$	(348	)	$	156,312	$	(2,643	)	$	252,887	$	(2,991	)