Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

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

The following tables present information related to the Company’s portfolio of securities available-for-sale and held-to-maturity at December 31, 2017 and 2016.

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(dollars in thousands)
December 31, 2017
Investment securities available-for-sale
Federal agency obligations	$	56,297	$	141	$	(416)	$	56,022
Residential mortgage pass-through securities		183,509		330		(1,948)		181,891
Commercial mortgage pass-through securities		4,054		3		(3)		4,054
Obligations of U.S. states and political subdivisions		130,723		1,739		(1,334)		131,128
Trust preferred securities		4,577		205		(111)		4,671
Corporate bonds and notes		29,801		163		(271)		29,693
Asset-backed securities		12,021		66		(37)		12,050
Certificates of deposit		621		4		-		625
Equity securities		11,843		235		(350)		11,728
Other securities		3,422		-		-		3,422
Total securities available-for-sale	$	436,868	$	2,886	$	(4,470)	$	435,284

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2016	(dollars in thousands)
Investment securities available-for-sale
Federal agency obligations	$	52,826	$	282	$	(271)	$	52,837
Residential mortgage pass-through securities		72,922		519		(944)		72,497
Commercial mortgage pass-through securities		4,186		23		-		4,209
Obligations of U.S. states and political subdivisions		148,747		2,789		(931)		150,605
Trust preferred securities		5,575		242		(151)		5,666
Corporate bonds and notes		36,717		586		(375)		36,928
Asset-backed securities		14,867		2		(286)		14,583
Certificates of deposit		973		10		-		983
Equity securities		11,843		192		(325)		11,710
Other securities		3,272		-		-		3,272
Total securities available-for-sale	$	351,928	$	4,645	$	(3,283)	$	353,290

Investments Classified by Contractual Maturity Date [Table Text Block]

The following table presents information for investments in securities available-for-sale at December 31, 2017, based on scheduled maturities. Actual maturities can be expected to differ from scheduled maturities due to prepayment or early call options of the issuer. Securities not due at a single maturity date are shown separately.

	December 31, 2017
	Amortized Cost		Fair Value
	(dollars in thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	7,964	$	7,985
Due after one year through five years		28,056		28,294
Due after five years through ten years		39,646		40,069
Due after ten years		158,374		157,841
Residential mortgage pass-through securities		183,509		181,891
Commercial mortgage pass-through securities		4,054		4,054
Equity securities		11,843		11,728
Other securities		3,422		3,422
Total securities available-for-sale	$	436,868	$	435,284

Schedule of Realized Gain (Loss) [Table Text Block]

Gross gains and losses from the sales, calls, and maturities of investment securities for the years ended December 31, 2017, 2016 and 2015 were as follows:

	Years Ended December 31,
	2017		2016		2015
	(dollars in thousands)
Proceeds	$	29,543	$	85,253	$	65,231
Gross gains on sales of investment securities		1,596	$	4,234	$	3,931
Gross losses on sales of investment securities		-		-		-
Net gains on sales of investment securities		1,596		4,234		3,931
Less: tax provision on net gains		(579)		(1,682)		(1,564)
Net gains on sales of investment securities, after tax	$	1,017	$	2,552	$	2,367

Schedule of Unrealized Loss on Investments [Table Text Block]

The following tables indicate gross unrealized losses not recognized in income and fair value, aggregated by investment category and the length of time individual securities have been in a continuous unrealized loss position at December 31, 2017 and 2016. There were no investments held-to-maturity as of December 31, 2017 and 2016.

	December 31, 2017
	Total				Less than 12 Months				12 Months or Longer
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(dollars in thousands)
Investment Securities Available-for-Sale:
Federal agency obligation	$	39,813	$	(416)	$	28,407	$	(213)	$	11,406	$	(203)
Residential mortgage pass-through securities		148,574		(1,948)		117,556		(1,146)		31,018		(802)
Commercial mortgage pass-through securities		1,198		(3)		1,198		(3)		-		-
Obligations of U.S. states and political subdivisions		57,685		(1,334)		17,909		(246)		39,776		(1,088)
Trust preferred securities		1,469		(111)		-		-		1,469		(111)
Corporate bonds and notes		11,074		(271)		1,965		(21)		9,109		(250)
Asset-backed securities		7,428		(37)		993		(2)		6,435		(35)
Equity securities		11,116		(350)		-		-		11,116		(350)
Total Temporarily Impaired Securities	$	278,357	$	(4,470)	$	168,028	$	(1,631)	$	110,329	$	(2,839)

	December 31, 2016
	Total				Less than 12 Months				12 Months or Longer
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	(dollars in thousands)
Investment Securities Available-for-Sale:
Federal agency obligation	$	22,672	$	(271)	$	21,416	$	(262)	$	1,256	$	(9)
Residential mortgage pass-through securities		50,136		(944)		49,817		(937)		319		(7)
Obligations of U.S. states and political subdivisions		52,307		(931)		52,307		(931)		-		-
Trust preferred securities		1,427		(151)		-		-		1,427		(151)
Corporate bonds and notes		15,930		(375)		7,671		(265)		8,259		(110)
Asset-backed securities		13,404		(286)		3,743		(88)		9,661		(198)
Equity securities		11,467		(325)		-		-		11,467		(325)
Total Temporarily Impaired Securities	$	167,343	$	(3,283)	$	134,954	$	(2,483)	$	32,389	$	(800)