Securities (Tables)

6 Months Ended

Jun. 30, 2022

Securities

Schedule of amortized cost and estimated fair value of securities

			Gross		Gross		Allowance		Estimated
	Amortized		Unrealized		Unrealized		for Credit		Fair
June 30, 2022	Cost		Gains		(Losses)		Losses		Value
	(Dollars in thousands)
Securities available-for-sale:
U.S. Treasury	$	251,365	$	224	$	(1,463)	$	—	$	250,126
Agency mortgage-backed securities		84,952		2		(2,951)		—		82,003
Total	$	336,317	$	226	$	(4,414)	$	—	$	332,129
			Gross		Gross		Estimated		Allowance
	Amortized		Unrecognized		Unrecognized		Fair		for Credit
June 30, 2022	Cost		Gains		(Losses)		Value		Losses
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	683,779	$	1	$	(72,491)	$	611,289	$	—
Municipals - exempt from Federal tax		39,976		86		(522)		39,540		(39)
Total	$	723,755	$	87	$	(73,013)	$	650,829	$	(39)

			Gross		Gross		Allowance		Estimated
	Amortized		Unrealized		Unrealized		for Credit		Fair
December 31, 2021	Cost		Gains		(Losses)		Losses		Value
	(Dollars in thousands)
Securities available-for-sale:
Agency mortgage-backed securities	$	99,359	$	2,893	$	—	$	—	$	102,252
Total	$	99,359	$	2,893	$	—	$	—	$	102,252
			Gross		Gross		Estimated		Allowance
	Amortized		Unrecognized		Unrecognized		Fair		for Credit
December 31, 2021	Cost		Gains		(Losses)		Value		Losses
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	607,377	$	3,157	$	(4,752)	$	605,782	$	—
Municipals - exempt from Federal tax		51,063		804		—		51,867		(43)
Total	$	658,440	$	3,961	$	(4,752)	$	657,649	$	(43)

Schedule of securities with unrealized losses

	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
June 30, 2022	Value		(Losses)		Value		(Losses)		Value		(Losses)
	(Dollars in thousands)
Securities available-for-sale:
U.S. Treasury	$	218,960	$	(1,463)	$	—	$	—	$	218,960	$	(1,463)
Agency mortgage-backed securities		81,550		(2,951)		—		—		81,550		(2,951)
Total	$	300,510	$	(4,414)	$	—	$	—	$	300,510	$	(4,414)
Securities held-to-maturity:
Agency mortgage-backed securities	$	580,869	$	(66,582)	$	29,473	$	(5,909)	$	610,342	$	(72,491)
Municipals — exempt from Federal tax		23,120		(522)		—		—		23,120		(522)
Total	$	603,989	$	(67,104)	$	29,473	$	(5,909)	$	633,462	$	(73,013)

	Less Than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2021	Value		(Losses)		Value		(Losses)		Value		(Losses)
	(Dollars in thousands)
Securities held-to-maturity:
Agency mortgage-backed securities	$	408,856	$	(3,319)	$	27,997	$	(1,433)	$	436,853	$	(4,752)
Total	$	408,856	$	(3,319)	$	27,997	$	(1,433)	$	436,853	$	(4,752)

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 after one through five years	$	251,365	$	250,126
Agency mortgage-backed securities		84,952		82,003
Total	$	336,317	$	332,129

	Held-to-maturity
	Amortized		Estimated
	Cost		Fair Value
	(Dollars in thousands)
Due after three months through one year	$	549	$	550
Due after one through five years		7,496		7,523
Due after five through ten years		26,335		25,970
Due after ten years		5,596		5,497
Agency mortgage-backed securities		683,779		611,289
Total	$	723,755	$	650,829

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, 2022	$	43
Provision for (recapture of) credit losses		(4)
Ending balance June 30, 2022	$	39