Securities (Tables)

12 Months Ended

Dec. 31, 2020

Securities

Schedule of amortized cost and estimated fair value of securities

			Gross		Gross		Allowance		Estimated
	Amortized		Unrealized		Unrealized		for Credit		Fair
December 31, 2020	Cost		Gains		(Losses)		Losses		Value
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	170,215	$	5,111	$	—	$	—	$	175,326
U.S. Treasury		59,797		651		—		—		60,448
Total	$	230,012	$	5,762	$	—	$	—	$	235,774
			Gross		Gross		Estimated		Allowance
	Amortized		Unrecognized		Unrecognized		Fair		for Credit
December 31, 2020	Cost		Gains		(Losses)		Value		Losses
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	228,652	$	6,075	$	(230)	$	234,497	$	—
Municipals - exempt from Federal tax		68,791		1,639		—		70,430		(54)
Total	$	297,443	$	7,714	$	(230)	$	304,927	$	(54)

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
December 31, 2019	Cost		Gains		(Losses)		Value
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	283,598	$	934	$	(171)	$	284,361
U.S. Treasury		118,939		1,525		—		120,464
Total	$	402,537	$	2,459	$	(171)	$	404,825
			Gross		Gross		Estimated
	Amortized		Unrecognized		Unrecognized		Fair
December 31, 2019	Cost		Gains		(Losses)		Value
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	285,344	$	1,206	$	(968)	$	285,582
Municipals - exempt from Federal tax		81,216		1,313		(4)		82,525
Total	$	366,560	$	2,519	$	(972)	$	368,107

Schedule of securities with unrealized losses

	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2020	Value		(Losses)		Value		(Losses)		Value		(Losses)
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	30,930		(230)	$	—	$	—	$	30,930	$	(230)
Total	$	30,930	$	(230)	$	—	$	—	$	30,930	$	(230)

	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2019	Value		(Losses)		Value		(Losses)		Value		(Losses)
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	100,816	$	(105)	$	27,534	$	(66)	$	128,350	$	(171)
Total	$	100,816	$	(105)	$	27,534	$	(66)	$	128,350	$	(171)
Securities held-to-maturity:
Agency mortgage-backed securities	$	50,060	$	(178)	$	88,128	$	(790)	$	138,188	$	(968)
Municipals - exempt from Federal tax		1,556		(4)		—		—		1,556		(4)
Total	$	51,616	$	(182)	$	88,128	$	(790)	$	139,744	$	(972)

Schedule of proceeds from sales of securities and the resulting gains and losses

	2020		2019		2018
	(Dollars in thousands)
Proceeds	$	56,598	$	167,551	$	94,291
Gross gains		277		1,094		1,243
Gross losses		—		(433)		(977)

Schedule of amortized cost and estimated fair values of securities, by contractual maturity

	Available-for-sale
	Amortized		Estimated
	Cost		Fair Value
	(Dollars in thousands)
Due 3 months or less	$	14,988	$	15,039
Due after 3 months through one year		44,809		45,409
Agency mortgage-backed securities		170,215		175,326
Total	$	230,012	$	235,774

	Held-to-maturity
	Amortized		Estimated
	Cost		Fair Value
	(Dollars in thousands)
Due after 3 months through one year	$	493	$	499
Due after one through five years		10,390		10,757
Due after five through ten years		31,509		32,149
Due after ten years		26,399		27,025
Agency mortgage-backed securities		228,652		234,497
Total	$	297,443	$	304,927

Schedule of roll-forward by major security type of the allowance for credit losses on debt securities held-to-maturity

		Municipals
		(Dollars in thousands)
Beginning balance January 1, 2020	$	-
Impact of adopting Topic 326		58
Provision (credit) for credit loss		(4)
Ending balance December 31, 2020	$	54