Securities (Tables)

3 Months Ended

Mar. 31, 2016

Securities

Schedule of amortized cost and estimated fair value of securities

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	388,282	$	4,543	$	(72	)	$	392,753
U.S. Treasury		30,054		278		—			30,332
Trust preferred securities		15,000		225		—			15,225
U.S. Government sponsored entities		9,041		140		—			9,181
Corporate bonds		1,005		44					1,049
Total	$	443,382	$	5,230	$	(72	)	$	448,540
Securities held-to-maturity:
Municipals—tax exempt	$	92,589	$	2,091	$	(458	)	$	94,222
Agency mortgage-backed securities		92,576		296		(47	)		92,825
Total	$	185,165	$	2,387	$	(505	)	$	187,047

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	324,077	$	2,457	$	(2,304	)	$	324,230
U.S. Treasury		30,047		—		(44	)		30,003
Trust preferred securities		15,000		132		—			15,132
U.S. Government sponsored entities		9,042		13		(14	)		9,041
Corporate bonds		6,412		261		—			6,673
Total	$	384,578	$	2,863	$	(2,362	)	$	385,079
Securities held-to-maturity:
Municipals—tax exempt	$	93,518	$	1,517	$	(863	)	$	94,172
Agency mortgage-backed securities		15,793		24		(168	)		15,649
Total	$	109,311	$	1,541	$	(1,031	)	$	109,821

Schedule of securities with unrealized losses

	Less Than 12 Months					12 Months or More					Total
March 31, 2016	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	57,940	$	(58	)	$	4,182	$	(14	)	$	62,122	$	(72	)
Total	$	57,940	$	(58	)	$	4,182	$	(14	)	$	62,122	$	(72	)
Securities held-to-maturity:
Municipals—Tax Exempt	$	2,051	$	(24	)	$	18,643	$	(434	)	$	20,694	$	(458	)
Agency mortgage-backed securities		7,297		(14	)		3,705		(33	)		11,002		(47	)
Total	$	9,348	$	(38	)	$	22,348	$	(467	)	$	31,696	$	(505	)

	Less Than 12 Months					12 Months or More					Total
December 31, 2015	Fair Value		Unrealized (Losses)			Fair Value		Unrealized (Losses)			Fair Value		Unrealized (Losses)
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	241,067	$	(2,258	)	$	2,165	$	(46	)	$	243,232	$	(2,304	)
U.S. Treasury		30,003		(44	)		—		—			30,003		(44	)
U.S. Government sponsored entities		4,980		(14	)		—		—			4,980		(14	)
Total	$	276,050	$	(2,316	)	$	2,165	$	(46	)	$	278,215	$	(2,362	)
Securities held-to-maturity:
Municipals—Tax Exempt	$	9,920	$	(78	)	$	24,412	$	(785	)	$	34,332	$	(863	)
Agency mortgage-backed securities		7,152		(89	)		4,409		(79	)		11,561		(168	)
Total	$	17,072	$	(167	)	$	28,821	$	(864	)	$	45,893	$	(1,031	)

Schedule of proceeds from sales of securities and the resulting gains and losses

	Three Months Ended March 31,
	2016		2015
	(Dollars in thousands)
Proceeds	$	5,598	$	—
Gross gains		180		—
Gross losses		—		—

Schedule of amortized cost and estimated fair values of securities, by contractual maturity

        The amortized cost and estimated fair values of securities as of March 31, 2016, are shown by contractual maturity below.

	Available-for-sale
	Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Due after 3 months through one year	$	6,290	$	6,297
Due after one through five years		33,810		34,265
Due after ten years		15,000		15,225
Agency mortgage-backed securities		388,282		392,753
Total	$	443,382	$	448,540

	Held-to-maturity
	Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Due less than 3 months	$	612	$	614
Due after 3 months through one year		1,039		1,045
Due after one through five years		5,239		5,319
Due after five through ten years		14,726		15,533
Due after ten years		70,973		71,711
Agency mortgage-backed securities		92,576		92,825
Total	$	185,165	$	187,047