Investment Securities (Tables)

12 Months Ended

Sep. 30, 2022

Held to maturity and available for sale investment securities were as follows as of September 30, 2022 and 2021 (dollars in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
September 30, 2022
Held to Maturity
U.S. Treasury and U.S. government agency securities	$	170,676	$	11	$	(12,109)	$	158,578
Mortgage-backed securities ("MBS"):
U.S. government agencies	43,995		4		(2,486)		41,513
Private label residential	49,335		245		(2,392)		47,188

Taxable municipal securities	2,102		—		(67)		2,035
Bank issued trust preferred securities	500		—		(31)		469
Total	$	266,608	$	260	$	(17,085)	$	249,783

Available for Sale
MBS: U.S. government agencies	$	42,309	$	—	$	(894)	$	41,415
Total	$	42,309	$	—	$	(894)	$	41,415

September 30, 2021
Held to Maturity
U.S. Treasury and U.S. government agency securities	$	28,760	$	8	$	(99)	$	28,669
MBS:
U.S. government agencies	25,913		936		(122)		26,727
Private label residential	13,929		302		(23)		14,208
Bank issued trust preferred securities	500		5		—		505
Total	$	69,102	$	1,251	$	(244)	$	70,109

Available for Sale
MBS: U.S. government agencies	$	63,080	$	210	$	(114)	$	63,176


Total	$	63,080	$	210	$	(114)	$	63,176

Unrealized Gain (Loss) on Investments

Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2022 (dollars in thousands):


	Less Than 12 Months					12 Months or Longer					Total
	Estimated Fair Value		Gross Unrealized Losses		Qty	Estimated Fair Value		Gross Unrealized Losses		Qty	Estimated Fair Value		Gross Unrealized Losses
Held to Maturity
U.S. Treasury and U.S. government agency securities	$	115,504	$	(7,224)	17	$	33,638	$	(4,885)	9	$	149,142	$	(12,109)
MBS:
U.S. government agencies	35,896		(1,449)		54	5,306		(1,037)		5	41,202		(2,486)
Private label residential	35,447		(2,166)		27	8,708		(226)		6	44,155		(2,392)
Taxable municipal securities	2,035		(67)		1	—		—		—	2,035		(67)
Bank issued trust preferred securities	469		(31)		1	—		—		—	469		(31)
Total	$	189,351	$	(10,937)	100	$	47,652	$	(6,148)	20	$	237,003	$	(17,085)

Available for Sale
MBS:
U.S. government agencies	$	25,170	$	(292)	16	$	15,705	$	(602)	13	$	40,875	$	(894)
Total	$	25,170	$	(292)	16	$	15,705	$	(602)	13	$	40,875	$	(894)

Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2021 (dollars in thousands):


	Less Than 12 Months					12 Months or Longer					Total
	Estimated Fair Value		Gross Unrealized Losses		Qty	Estimated Fair Value		Gross Unrealized Losses		Qty	Estimated Fair Value		Gross Unrealized Losses
Held to Maturity
U.S. Treasury and U.S. government agency securities	$	18,795	$	(99)	5	$	—	$	—	—	$	18,795	$	(99)
MBS:
U.S. government agencies	8,091		(122)		5	15		—		3	8,106		(122)
Private label residential	9,712		(23)		4	1		—		1	9,713		(23)


Total	$	36,598	$	(244)	14	$	16	$	—	4	$	36,614	$	(244)

Available for Sale
MBS:
U.S. government agencies	$	20,146	$	(103)	13	$	5,491	$	(11)	3	$	25,637	$	(114)


Total	$	20,146	$	(103)	13	$	5,491	$	(11)	3	$	25,637	$	(114)

Schedule of Significant Inputs Utilized to Measure Estimate of Credit Loss Component on OTTI Securities

The following table presents a summary of the significant inputs utilized to measure management’s estimates of the credit loss component on OTTI securities as of September 30, 2022, 2021 and 2020:


	Range				Weighted
	Minimum		Maximum		Average
September 30, 2022
Constant prepayment rate	6.00	%	15.00	%	12.98	%
Collateral default rate	0.58	%	25.64	%	9.96	%
Loss severity rate	—	%	8.19	%	3.36	%

September 30, 2021
Constant prepayment rate	6.00	%	15.00	%	10.20	%
Collateral default rate	1.47	%	17.55	%	12.19	%
Loss severity rate	—	%	12.96	%	4.55	%

September 30, 2020
Constant prepayment rate	6.00	%	15.00	%	8.97	%
Collateral default rate	2.17	%	27.39	%	14.37	%
Loss severity rate	—	%	11.27	%	2.87	%

Schedule of Other than Temporary Impairments

Other than Temporary Impairment, Credit Losses Recognized in Earnings

The following table presents a roll forward of the credit loss component of held to maturity and available for sale debt securities that have been written down for OTTI with the credit loss component recognized in earnings for the years ended September 30, 2022, 2021 and 2020 (dollars in thousands):


	2022		2021		2020
Balance, beginning of year	$	853	$	885	$	1,071

Additions:

Additional increases to the amount related to credit losses for which OTTI was previously recognized	—		2		3
Subtractions:
Net realized gain (losses) previously recorded as credit losses	1		(12)		(66)
Recovery of prior credit loss	(18)		(22)		(123)
Balance, end of year	$	836	$	853	$	885

Schedule of Contractual Maturities of Debt Securities

The contractual maturities of debt securities at September 30, 2022 are as follows (dollars in thousands). Expected maturities may differ from scheduled maturities due to the prepayment of principal or call provisions.


	Held to Maturity				Available for Sale
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	3,027	$	2,983	$	—	$	—
Due after one year to five years	162,601		154,206		3,169		3,159
Due after five years to ten years	38,770		34,197		9,252		9,152
Due after ten years	62,210		58,397		29,888		29,104
Total	$	266,608	$	249,783	$	42,309	$	41,415