INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2018

Amortized cost and Estimated fair values of Investments Available-for-sale

			September 30, 2018								December 31, 2017
					Gross		Gross		Estimated				Gross		Gross		Estimated
			Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
(In thousands)			Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
U.S. treasuries and government agencies			$	246,840	$	-	$	(7,384)	$	239,456	$	109,349	$	-	$	(2,781)	$	106,568
State and municipal				297,348		1,952		(2,794)		296,506		306,109		6,313		(169)		312,253
Mortgage-backed				393,878		472		(13,719)		380,631		302,664		1,585		(4,209)		300,040
Corporate debt				9,100		152		-		9,252		9,100		332		-		9,432
Trust preferred				310		-		-		310		931		71		-		1,002
	Total debt securities			947,476		2,576		(23,897)		926,155		728,153		8,301		(7,159)		729,295
Marketable equity securities				568		-		-		568		212		-		-		212
		Total investments available-for-sale	$	948,044	$	2,576	$	(23,897)	$	926,723	$	728,365	$	8,301	$	(7,159)	$	729,507

Other Equity Securities

Equity securities

Other equity securities at the dates indicated are presented in the following table:

(In thousands)		September 30, 2018		December 31, 2017
Federal Reserve Bank stock		$	22,456	$	8,398
Federal Home Loan Bank of Atlanta stock			43,618		37,120
	Total equity securities	$	66,074	$	45,518

Available-for-Sale Securities

Gross Unrealized Losses and Fair Value by Length of Time

Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in an unrealized loss position at the dates indicated are presented in the following table:

		September 30, 2018
						Continuous Unrealized
						Losses Existing for:
		Number								Total
		of				Less than		More than		Unrealized
(Dollars in thousands)		Securities		Fair Value		12 months		12 months		Losses
U.S. treasuries and government agencies			48	$	239,456	$	1,799	$	5,585	$	7,384
State and municipal			133		126,066		2,617		177		2,794
Mortgage-backed			140		358,854		5,858		7,861		13,719
	Total		321	$	724,376	$	10,274	$	13,623	$	23,897

		December 31, 2017
						Continuous Unrealized
						Losses Existing for:
		Number								Total
		of				Less than		More than		Unrealized
(Dollars in thousands)		Securities		Fair Value		12 months		12 months		Losses
U.S. treasuries and government agencies			13	$	106,568	$	545	$	2,236	$	2,781
State and municipal			20		18,228		107		62		169
Mortgage-backed			46		221,621		402		3,807		4,209
	Total		79	$	346,417	$	1,054	$	6,105	$	7,159

Amortized Cost and Estimated Fair Values of Investment Securities

The amortized cost and estimated fair values of debt securities available-for-sale by contractual maturity at the dates indicated are provided in the following table. The Company has allocated mortgage-backed securities into the four maturity groupings reflected in the following table using the expected average life of the individual securities based on statistics provided by independent third party industry sources. Expected maturities will differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.

		September 30, 2018				December 31, 2017
				Estimated				Estimated
		Amortized		Fair		Amortized		Fair
(In thousands)		Cost		Value		Cost		Value
Due in one year or less		$	58,653	$	59,057	$	12,789	$	12,889
Due after one year through five years			263,959		263,262		180,109		184,264
Due after five years through ten years			278,132		269,055		228,484		227,688
Due after ten years			346,732		334,781		306,771		304,454
	Total debt securities available for sale	$	947,476	$	926,155	$	728,153	$	729,295