Investment Securities (Tables)

9 Months Ended

Sep. 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:

	September 30, 2021
(Dollars in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
United States government agency securities	$	42,226	$	342	$	(597)	$	41,971
United States sponsored mortgage-backed securities	85,754		401		(884)		85,271
United States treasury securities	82,738		—		(316)		82,422
Municipal securities	202,717		5,182		(476)		207,423
Other debt securities	7,500		—		—		7,500
Total debt securities	420,935		5,925		(2,273)		424,587
Other securities	14,282		177		(23)		14,436
Total investment securities available-for-sale	$	435,217	$	6,102	$	(2,296)	$	439,023

	December 31, 2020
(Dollars in thousands)	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
United States government agency securities	$	53,207	$	872	$	(210)	$	53,869
United States sponsored mortgage-backed securities	94,968		972		(171)		95,769
United States treasury securities	3,000		123		—		3,123
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:

	September 30, 2021
(Dollars in thousands)	Amortized Cost		Fair Value
Within one year	$	5	$	5
After one year, but within five years	86,798		86,542
After five years, but within ten years	34,205		35,079
After ten years	299,927		302,961
Total	$	420,935	$	424,587

Investments in an Unrealized Loss Position

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

	September 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 (20)	$	4,334	$	(138)	$	18,113	$	(459)
United States sponsored mortgage-backed securities (27)	57,861		(803)		4,431		(81)
United States treasury securities (18)	82,423		(316)		—		—
Municipal securities (56)	40,069		(430)		2,898		(46)
Other securities (1)	—		—		1,477		(23)
	$	184,687	$	(1,687)	$	26,919	$	(609)

	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 September 30,				Nine Months Ended September 30,
(Dollars in thousands)	2021		2020		2021		2020
Sales of available-for-sale securities	$	28,049	$	7,379	$	103,365	$	48,579
Gains, gross	547		69		3,411		899
Losses, gross	18		34		31		34
Sales of equity securities	$	—	$	669	$	61	$	669
Gain, gross	—		18		5		48
Losses, gross	—		—		—		—
Unrealized holding gains on equity securities	536		94		1,750		111