INVESTMENT SECURITIES (Tables)

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Unrealized Gain (Loss) on Investments [Table Text Block]

The amortized cost, related estimated fair value, and unrealized gains and losses for investment securities classified as “Available-For-Sale” or “Held-to-Maturity” were as follows at June 30, 2017 and December 31, 2016:

	Available-for-Sale Securities
(Dollars in thousands)			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
June 30, 2017:
U.S. Treasury securities	$	1,001	$	—	$	—	$	1,001
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed		107,331		358		(916)		106,773
Other		23,717		147		(268)		23,596
Obligations of state and political subdivisions		223,321		4,591		(1,460)		226,452
Corporate debt securities		34,955		79		(830)		34,204
Marketable equity securities		809		868		—		1,677
Total	$	391,134	$	6,043	$	(3,474)	$	393,703

	Held-to-Maturity Securities
(Dollars in thousands)			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
June 30, 2017:
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed	$	—	$	—	$	—	$	—
Total	$	—	$	—	$	—	$	—

	Available-for-Sale Securities
(Dollars in thousands)			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
December 31, 2016:
U.S. Treasury securities	$	1,008	$	2	$	—	$	1,010
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed		112,155		83		(1,331)		110,907
Other		21,399		82		(511)		20,970
Obligations of state and political subdivisions		211,154		2,776		(2,796)		211,134
Corporate debt securities		35,178		4		(1,206)		33,976
Marketable equity securities		810		830		—		1,640
Total	$	381,704	$	3,777	$	(5,844)	$	379,637

	Held-to-Maturity Securities
(Dollars in thousands)			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
December 31, 2016:
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed	$	4	$	—	$	—	$	4
Total	$	4	$	—	$	—	$	4

Investments Classified by Contractual Maturity Date [Table Text Block]

The amortized cost, estimated fair value and weighted average yield of debt and equity securities, by contractual maturity, are shown below at June 30, 2017. 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)

	June 30, 2017
	Available-For-Sale															Held-To-Maturity
				U.S. Government			Obligations									U.S. Government
				Corporations &			of State			Corporate			Marketable			Corporations &
	U.S. Treasury			Agencies			& Political			Debt			Equity			Agencies
	Securities			Obligations1			Subdivisions2			Securities			Securities3			Obligations1
Within 1 Year:
Amortized cost	$	1,001		$	—		$	1,250		$	535		$	—		$	—
Fair value		1,001			—			1,250			520			—			—
Weighted average yield		0.96	%		—			1.40	%		2.78	%		—			—
1 - 5 Years:
Amortized cost		—			16,510			27,821			11,559			—			—
Fair value		—			16,549			28,104			11,491			—			—
Weighted average yield		—			2.15	%		2.90	%		2.37	%		—			—
5 - 10 Years:
Amortized cost		—			48,081			71,569			22,861			—			—
Fair value		—			47,308			72,654			22,193			—			—
Weighted average yield		—			2.14	%		3.29	%		2.67	%		—			—
After 10 Years:
Amortized cost		—			66,457			122,681			—			809			—
Fair value		—			66,512			124,444			—			1,677			—
Weighted average yield		—			1.98	%		3.59	%		—			5.44	%		—
Total:
Amortized cost	$	1,001		$	131,048		$	223,321		$	34,955		$	809		$	—
Fair value		1,001			130,369			226,452			34,204			1,677			—
Weighted average yield		0.96	%		2.06	%		3.40	%		2.57	%		5.44	%		—

¹Mortgage-backed securities are allocated for maturity reporting at their original maturity date.

²Average yields on tax-exempt obligations of state and political subdivisions have been computed on a tax-equivalent basis using a 34% tax rate.

³Marketable equity securities are not considered to have defined maturities and are included in the after ten year category.

Schedule of Unrealized Loss on Investments [Table Text Block]

In accordance with disclosures required by FASB ASC 320-10-50, Investments - Debt and Equity Securities, the summary below shows the gross unrealized losses and fair value of the Corporation’s investments, aggregated by investment category, that individual securities have been in a continuous unrealized loss position for less than 12 months or 12 months or more as of June 30, 2017 and December 31, 2016:

June 30, 2017

(Dollars in thousands)	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
Available-for-Sale:
U.S. Treasury securities	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed		41,537		(727)		14,400		(189)		55,937		(916)
Other		11,380		(268)		—		—		11,380		(268)
Obligations of state and political subdivisions		54,016		(1,391)		1,513		(69)		55,529		(1,460)
Corporate debt securities		6,249		(402)		17,717		(428)		23,966		(830)
Marketable equity securities		—		—		—		—		—		—
	$	113,182	$	(2,788)	$	33,630	$	(686)	$	146,812	$	(3,474)

December 31, 2016

(Dollars in thousands)	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
Available-for-Sale:
U.S. Treasury securities	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of U.S. Government Corporations and Agencies:
Mortgage-backed		89,444		(1,216)		8,783		(115)		98,227		(1,331)
Other		10,340		(500)		1,741		(11)		12,081		(511)
Obligations of state and political subdivisions		95,481		(2,796)		—		—		95,481		(2,796)
Corporate debt securities		21,656		(749)		10,298		(457)		31,954		(1,206)
Marketable equity securities		—		—		—		—		—		—
	$	216,921	$	(5,261)	$	20,822	$	(583)	$	237,743	$	(5,844)