Investment Securities (Tables)

12 Months Ended

Dec. 31, 2020

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 as of December 31, 2020 and 2019.

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(dollars in thousands)
December 31, 2020
Investment securities available-for-sale
Federal agency obligations	$	37,015	$	1,508	$	(65)	$	38,458
Residential mortgage pass-through securities		266,114		4,811		(41)		270,884
Commercial mortgage pass-through securities		6,906		203		(187)		6,922
Obligations of U.S. states and political subdivisions​​		138,539		4,269		-		142,808
Corporate bonds and notes		24,925		222		(52)		25,095
Asset-backed securities		3,521		-		(41)		3,480
Certificates of deposit		149		2		-		151
Other securities		157		-		-		157
Total securities available-for-sale	$	477,326	$	11,015	$	(386)	$	487,955

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(dollars in thousands)
December 31, 2019
Investment securities available-for-sale
Federal agency obligations	$	27,667	$	612	$	(42)	$	28,237
Residential mortgage pass-through securities		199,611		1,528		(643)		200,496
Commercial mortgage pass-through securities		4,995		37		(35)		4,997
Obligations of U.S. states and political subdivisions​​		134,500		2,411		(392)		136,519
Corporate bonds and notes		28,142		285		(45)		28,382
Asset-backed securities		5,845		-		(65)		5,780
Certificates of deposit		148		2		-		150
Other securities		140		-		-		140
Total securities available-for-sale	$	401,048	$	4,875	$	(1,222)	$	404,701

Investments Classified by Contractual Maturity Date [Table Text Block]

The following table presents information for investments in securities available-for-sale as of December 31, 2020, 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, 2020
	Amortized Cost		Fair Value
	(dollars in thousands)
Investment Securities Available-for-Sale:
Due in one year or less	$	10,486	$	10,541
Due after one year through five years		19,968		20,180
Due after five years through ten years		18,316		18,797
Due after ten years		155,379		160,474
Residential mortgage pass-through securities		266,114		270,884
Commercial mortgage pass-through securities		6,906		6,922
Other securities		157		157
Total securities available-for-sale	$	477,326	$	487,955

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, 2020, 2019 and 2018 were as follows:

	Years Ended December 31,
	2020			2019			2018
	(dollars in thousands)
Proceeds	$	19,624		$	183,728		$	-
Gross gains on sales of investment securities	$	29		$	401		$	-
Gross losses on sales of investment securities		-			(681	)		-
Net gains (losses) on sales of investment securities		29			(280	)		-
Tax provision on net gains		(6	)		79			-
Net gains (losses) on sales of investment securities, after tax​​	$	23		$	(201	)	$	-

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 as of December 31, 2020 and 2019. There were no investments held-to-maturity as of December 31, 2020 and 2019.

	December 31, 2020
	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	$	8,978	$	(65	)	$	8,975	$	(65	)	$	3	$	-
Residential mortgage pass-through securities		20,895		(41	)		20,886		(41	)		9		-
Commercial mortgage pass-through securities		3,954		(187	)		3,954		(187	)		-		-
Corporate bonds and notes		3,928		(52	)		3,928		(52	)		-		-
Asset-backed securities		3,083		(41	)		622		-			2,461		(41	)
Total Temporarily Impaired Securities	$	40,838	$	(386	)	$	38,365	$	(345	)	$	2,473	$	(41	)

	December 31, 2019
	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	$	6,512	$	(42	)	$	6,498	$	(42	)	$	14	$	-
Residential mortgage pass-through securities		94,980		(643	)		49,154		(179	)		45,826		(464	)
Commercial mortgage pass-through securities		2,006		(35	)		2,006		(35	)		-		-
Obligations of U.S. states and political subdivisions		34,775		(392	)		10,306		(8	)		24,469		(384	)
Corporate bonds and notes		5,437		(45	)		2,478		(23	)		2,959		(22	)
Asset-backed securities		5,718		(65	)		2,268		(22	)		3,450		(43	)
Total Temporarily Impaired Securities	$	149,428	$	(1,222	)	$	72,710	$	(309	)	$	76,718	$	(913	)