INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2017

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

			2017								2016
					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. government agencies			$	109,349	$	-	$	(2,781)	$	106,568	$	124,314	$	32	$	(2,556)	$	121,790
State and municipal				306,109		6,313		(169)		312,253		281,090		7,180		(586)		287,684
Mortgage-backed				302,664		1,585		(4,209)		300,040		314,029		2,851		(4,169)		312,711
Corporate debt				9,100		332		-		9,432		9,100		34		-		9,134
Trust preferred				931		71		-		1,002		1,089		-		(77)		1,012
	Total debt securities			728,153		8,301		(7,159)		729,295		729,622		10,097		(7,388)		732,331
Marketable equity securities				212		-		-		212		1,223		-		-		1,223
		Total investments available-for-sale	$	728,365	$	8,301	$	(7,159)	$	729,507	$	730,845	$	10,097	$	(7,388)	$	733,554

Activity of OTTI on investment Securities Due to Credit Losses Recognized in Earnings

(In thousands)		OTTI Losses
Cumulative credit losses on investment securities, through December 31, 2015	$	531
Additions for credit losses not previously recognized		-
Cumulative credit losses on investment securities, through December 31, 2016		531
Additions for credit losses not previously recognized		-
Cumulative credit losses on investment securities, through December 31, 2017	$	531

Gross Unrealized Losses and Fair Value by Length of Time

		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. 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

		2016
						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. government agencies			12	$	96,788	$	2,556	$	-	$	2,556
State and municipal			53		48,010		516		70		586
Mortgage-backed			37		212,844		3,971		198		4,169
Trust preferred			1		1,012		-		77		77
	Total		103	$	358,654	$	7,043	$	345	$	7,388

Amortized Cost and Estimated Fair Values of Investment Securities

		2017				2016
				Estimated				Estimated
		Amortized		Fair		Amortized		Fair
(In thousands)		Cost		Value		Cost		Value
Due in one year or less		$	12,789	$	12,889	$	7,493	$	7,541
Due after one year through five years			180,109		184,264		156,953		162,233
Due after five years through ten years			228,484		227,688		282,468		282,713
Due after ten years			306,771		304,454		282,708		279,844
	Total debt securities available-for-sale	$	728,153	$	729,295	$	729,622	$	732,331

Other Equity Securities

(In thousands)		2017		2016
Federal Reserve Bank stock		$	8,398	$	8,334
Federal Home Loan Bank of Atlanta stock			37,120		37,760
	Total equity securities	$	45,518	$	46,094

Gross Realized Gains and Losses on All Investments

(In thousands)		2017		2016		2015
Gross realized gains from sales of investments available-for-sale		$	-	$	1,491	$	-
Net gains from calls of investments available-for-sale			32		440		18
Net gains from calls of investments held-to-maturity			-		1		18
Gross realized gains from sales of equity securities			1,241		-		-
	Net securities gains	$	1,273	$	1,932	$	36