Investment Securities (Tables)

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Fair Values of Investment Securities Available-for-sale

The following tables present amortized cost and fair values of investment securities available-for-sale as of the periods indicated:

	June 30, 2021
(Dollars in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
United States government agency securities	$	43,428	$	341	$	(567)	$	43,202
United States sponsored mortgage-backed securities	87,082		340		(1,186)		86,236
United States treasury securities	106,869		78		(291)		106,656
Municipal securities	191,010		5,517		(278)		196,249
Other debt securities	7,500		—		—		7,500
Total debt securities	435,889		6,276		(2,322)		439,843
Other securities	10,787		178		(36)		10,929
Total investment securities available-for-sale	$	446,676	$	6,454	$	(2,358)	$	450,772

	December 31, 2020
(Dollars in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
United States government agency securities	$	56,207	$	995	$	(210)	$	56,992
United States sponsored mortgage-backed securities	94,968		972		(171)		95,769
Municipal securities	223,642		8,327		(82)		231,887
Other debt securities	7,500		—		—		7,500
Total debt securities	382,317		10,294		(463)		392,148
Other securities	18,401		146		(71)		18,476
Total investment securities available-for-sale	$	400,718	$	10,440	$	(534)	$	410,624

The following table presents amortized cost and fair values of available-for-sale debt securities by contractual maturity as of the period indicated:

	June 30, 2021
(Dollars in thousands)	Amortized Cost		Fair Value
Within one year	$	—	$	—
After one year, but within five years	87,689		87,564
After five years, but within ten years	59,339		59,499
After ten years	288,861		292,780
Total	$	435,889	$	439,843

Investments in an Unrealized Loss Position

The following tables present investments in an unrealized loss position as of the periods indicated:

	June 30, 2021
(Dollars in thousands)	Less than 12 months				12 months or more
Description and number of positions	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
United States government agency securities (22)	$	23,645	$	(498)	$	6,493	$	(69)
United States sponsored mortgage-backed securities (21)	65,666		(1,177)		1,946		(9)
United States treasury securities (18)	82,564		(291)		—		—
Municipal securities (39)	28,119		(271)		1,049		(7)
Other securities (1)	—		—		1,464		(36)
	$	199,994	$	(2,237)	$	10,952	$	(121)

	December 31, 2020
(Dollars in thousands)	Less than 12 months				12 months or more
Description and number of positions	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
United States government agency securities (27)	$	19,021	$	(68)	$	12,574	$	(142)
United States sponsored mortgage-backed securities (9)	15,331		(155)		3,349		(16)
Municipal securities (14)	11,856		(82)		—		—
Other securities (5)	3,947		(71)		—		—
	$	50,155	$	(376)	$	15,923	$	(158)

Realized Gain (Loss) on Investments

The following table summarizes investment sales, related gains and losses, and unrealized holding gains for the periods shown:

	Three Months Ended June 30,				Six Months Ended June 30,
(Dollars in thousands)	2021		2020		2021		2020
Sales of available-for-sale securities	$	34,279	$	30,860	$	75,316	$	41,160
Gains, gross	1,708		554		2,864		830
Losses, gross	—		—		13		—
Sales of equity securities	$	61	$	357	$	61	$	357
Gain, gross	5		30		5		30
Losses, gross	—		—		—		—
Unrealized holding gains on equity securities	699		3		1,214		17