Investment Securities (Tables)

3 Months Ended

Mar. 31, 2014

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
March 31, 2014
U.S. Treasury and Federal agencies securities	$	400,973	$	4,440	$	(4,023	)	$	401,390
U.S. States and political subdivisions securities	124,174		3,775		(555		)	127,394
Mortgage-backed securities — Federal agencies	266,392		5,395		(2,267		)	269,520
Corporate debt securities	31,875		308		(43		)	32,140
Foreign government and other securities	700		2		—			702
Total debt securities	824,114		13,920		(6,888		)	831,146
Marketable equity securities	1,893		6,560		(2		)	8,451
Total investment securities available-for-sale	$	826,007	$	20,480	$	(6,890	)	$	839,597
December 31, 2013
U.S. Treasury and Federal agencies securities	$	394,558	$	5,008	$	(4,527	)	$	395,039
U.S. States and political subdivisions securities	120,416		3,670		(847		)	123,239
Mortgage-backed securities — Federal agencies	273,495		5,148		(3,563		)	275,080
Corporate debt securities	30,828		241		(4		)	31,065
Foreign government and other securities	700		9		—			709
Total debt securities	819,997		14,076		(8,941		)	825,132
Marketable equity securities	2,166		5,404		(2		)	7,568
Total investment securities available-for-sale	$	822,163	$	19,480	$	(8,943	)	$	832,700

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 March 31, 2014. 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	$	37,524	$	38,027
Due after one year through five years	400,315		404,908
Due after five years through ten years	117,501		116,329
Due after ten years	2,382		2,362
Mortgage-backed securities	266,392		269,520
Total debt securities available-for-sale	$	824,114	$	831,146

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 and losses for the three months ended March 31, 2014 reflect the sale of marketable equity securities.

	Three Months Ended   March 31,
(Dollars in thousands)	2014		2013
Gross realized gains	$	963	$	—
Gross realized losses	—		—
Net realized gains (losses)	$	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
March 31, 2014
U.S. Treasury and Federal agencies securities	$	210,143	$	(3,876	)	$	15,044	$	(147	)	$	225,187	$	(4,023	)
U.S. States and political subdivisions securities	34,278		(528		)	915		(27		)	35,193		(555		)
Mortgage-backed securities - Federal agencies	72,185		(1,438		)	14,813		(829		)	86,998		(2,267		)
Corporate debt securities	6,066		(43		)	—		—			6,066		(43		)
Foreign government and other securities	100		—			—		—			100		—
Total debt securities	322,772		(5,885		)	30,772		(1,003		)	353,544		(6,888		)
Marketable equity securities	—		—			4		(2		)	4		(2		)
Total investment securities available-for-sale	$	322,772	$	(5,885	)	$	30,776	$	(1,005	)	$	353,548	$	(6,890	)
December 31, 2013
U.S. Treasury and Federal agencies securities	$	153,868	$	(4,404	)	$	15,085	$	(123	)	$	168,953	$	(4,527	)
U.S. States and political subdivisions securities	37,115		(814		)	1,419		(33		)	38,534		(847		)
Mortgage-backed securities - Federal agencies	99,488		(3,099		)	5,352		(464		)	104,840		(3,563		)
Corporate debt securities	6,332		(4		)	—		—			6,332		(4		)
Foreign government and other securities	—		—			—		—			—		—
Total debt securities	296,803		(8,321		)	21,856		(620		)	318,659		(8,941		)
Marketable equity securities	—		—			4		(2		)	4		(2		)
Total investment securities available-for-sale	$	296,803	$	(8,321	)	$	21,860	$	(622	)	$	318,663	$	(8,943	)