INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of available for sale and held to maturity investment securities

A summary of our investment securities portfolio as of December 31, 2015 and 2014 is as follows:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(Dollars in thousands)
December 31, 2015
Held-to-Maturity:
Mortgage-backed securities:
Residential - U.S. Government sponsored entities	$	152,315	$	123	$	(2,915	)	$	149,523
Commercial - U.S. Government sponsored entities	95,602		—		(989		)	94,613
Total	$	247,917	$	123	$	(3,904	)	$	244,136

Available-for-Sale:
Debt securities:
States and political subdivisions	$	187,552	$	3,819	$	(898	)	$	190,473
Corporate securities	107,721		1,077		(227		)	108,571
Mortgage-backed securities:
Residential - U.S. Government sponsored entities	771,657		5,885		(5,633		)	771,909
Residential - Non-government sponsored entities	64,286		733		(987		)	64,032
Commercial - Non-government sponsored entities	135,439		2,033		(1,118		)	136,354
Other	848		68		—			916
Total	$	1,267,503	$	13,615	$	(8,863	)	$	1,272,255

December 31, 2014
Held-to-Maturity:
Mortgage-backed securities:
Residential - U.S. Government sponsored entities	$	140,741	$	196	$	(2,150	)	$	138,787
Commercial - U.S. Government sponsored entities	97,546		—		(736		)	96,810
Total	$	238,287	$	196	$	(2,886	)	$	235,597

Available-for-Sale:
Debt securities:
States and political subdivisions	$	191,280	$	2,054	$	(1,689	)	$	191,645
Corporate securities	99,237		1,492		(125		)	100,604
Mortgage-backed securities:
Residential - U.S. Government sponsored entities	744,527		11,064		(4,033		)	751,558
Residential - Non-government sponsored entities	45,275		1,510		(92		)	46,693
Commercial - Non-government sponsored entities	135,630		2,946		(935		)	137,641
Other	757		120		—			877
Total	$	1,216,706	$	19,186	$	(6,874	)	$	1,229,018

Schedule of amortized cost and estimated fair value of investment securities by contractual maturity

The amortized cost and estimated fair value of our investment securities at December 31, 2015 by contractual maturity are shown below. Actual maturities will 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
	Amortized Cost		Estimated Fair Value
	(Dollars in thousands)
Held-to-Maturity:
Mortgage-backed securities	$	247,917	$	244,136

Available-for-Sale:
Due in one year or less	$	15,596	$	15,797
Due after one year through five years	106,255		107,125
Due after five years through ten years	73,452		74,980
Due after ten years	99,970		101,142
Mortgage-backed securities	971,382		972,295
Other	848		916
Total	$	1,267,503	$	1,272,255

Schedule of investment securities in an unrealized loss position

Provided below is a summary of investment securities which were in an unrealized loss position at December 31, 2015 and 2014:



	Less than 12 months					12 months or longer					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(Dollars in thousands)
December 31, 2015
Debt securities:
States and political subdivisions	$	30,481	$	(532	)	$	12,576	$	(366	)	$	43,057	$	(898	)
Corporate securities	32,977		(227		)	—		—			32,977		(227		)

Mortgage-backed securities:
Residential - U.S. Government sponsored entities	507,525		(6,241		)	88,271		(2,307		)	595,796		(8,548		)
Residential - Non-government sponsored entities	37,975		(987		)	—		—			37,975		(987		)
Commercial - U.S. Government sponsored entities	94,613		(989		)	—		—			94,613		(989		)
Commercial - Non-government sponsored entities	62,555		(961		)	4,644		(157		)	67,199		(1,118		)
Total temporarily impaired securities	$	766,126	$	(9,937	)	$	105,491	$	(2,830	)	$	871,617	$	(12,767	)

December 31, 2014
Debt securities:
States and political subdivisions	$	23,591	$	(145	)	$	68,622	$	(1,544	)	$	92,213	$	(1,689	)
Corporate securities	23,938		(125		)	—		—			23,938		(125		)

Mortgage-backed securities:
Residential - U.S. Government sponsored entities	107,755		(487		)	318,571		(5,696		)	426,326		(6,183		)
Residential - Non-government sponsored entities	15,895		(92		)	—		—			15,895		(92		)
Commercial - U.S. Government sponsored entities	11,455		(34		)	85,355		(702		)	96,810		(736		)
Commercial - Non-government sponsored entities	4,962		(8		)	47,539		(927		)	52,501		(935		)
Total temporarily impaired securities	$	187,596	$	(891	)	$	520,087	$	(8,869	)	$	707,683	$	(9,760	)