Investment Securities (Tables)

6 Months Ended

Mar. 31, 2023

Held to maturity and available for sale investment securities have been classified according to management’s intent and were as follows as of March 31, 2023 and September 30, 2022 (dollars in thousands):


	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
March 31, 2023
Held to maturity
U.S. Treasury and U.S. government agency securities	$	171,148	$	118	$	(9,244)	$	162,022
Mortgage-backed securities ("MBS"):
U.S. government agencies	54,522		234		(2,008)		52,748
Private label residential	49,660		260		(2,103)		47,817
Taxable municipal securities	2,081		—		(48)		2,033
Bank issued trust preferred securities	500		—		(28)		472
Total	$	277,911	$	612	$	(13,431)	$	265,092

Available for sale

MBS: U.S. government agencies	$	55,454	$	397	$	(1,013)	$	54,838
Total	$	55,454	$	397	$	(1,013)	$	54,838

September 30, 2022
Held to maturity
U.S. Treasury and U.S. government agency securities	$	170,676	$	11	$	(12,109)	$	158,578
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

Unrealized Gain (Loss) on Investments

Held to maturity and available for sale investment securities with unrealized losses were as follows as of March 31, 2023 (dollars in thousands):


	Less Than 12 Months					12 Months or Longer					Total
	Estimated Fair Value		Gross Unrealized Losses		Quantity	Estimated Fair Value		Gross Unrealized Losses		Quantity	Estimated Fair Value		Gross Unrealized Losses
Held to maturity
U.S. Treasury and U.S. government agency securities	$	9,507	$	(127)	1	$	142,892	$	(9,117)	25	$	152,399	$	(9,244)
MBS:
U.S. government agencies	22,367		(490)		24	12,627		(1,518)		28	34,994		(2,008)
Private label residential	21,709		(686)		15	22,643		(1,417)		19	44,352		(2,103)
Taxable municipal securities	2,034		(48)		1	—		—		—	2,034		(48)
Bank issued trust preferred securities	—		—		—	472		(28)		1	472		(28)
Total	$	55,617	$	(1,351)	41	$	178,634	$	(12,080)	73	$	234,251	$	(13,431)

Available for sale
MBS: U.S. government agencies	$	12,440	$	(252)	9	$	21,152	$	(761)	18	$	33,592	$	(1,013)
Total	$	12,440	$	(252)	9	$	21,152	$	(761)	18	$	33,592	$	(1,013)

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		Quantity	Estimated Fair Value		Gross Unrealized Losses		Quantity	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)

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 March 31, 2023 and 2022:


	Range				Weighted
	Minimum		Maximum		Average
March 31, 2023
Constant prepayment rate	6.00	%	15.00	%	7.38	%
Collateral default rate	—	%	19.63	%	10.56	%
Loss severity rate	—	%	3.17	%	1.04	%

March 31, 2022
Constant prepayment rate	6.00	%	15.00	%	8.37	%
Collateral default rate	0.53	%	21.55	%	10.53	%
Loss severity rate	—	%	8.53	%	3.72	%

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 six months ended March 31, 2023 and 2022 (dollars in thousands):


	Six Months Ended March 31,
	2023		2022
Beginning balance of credit loss	$	836	$	853



Additions (subtractions):
Net realized gain (loss) previously recorded as credit losses	(9)		1
Recovery of prior credit loss	(5)		(8)
Ending balance of credit loss	$	822	$	846

Schedule of Contractual Maturities of Debt Securities

The contractual maturities of debt securities at March 31, 2023 were 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	$	54,872	$	53,419	$	—	$	—
Due after one year to five years	123,311		117,192		3,200		3,180
Due after five years to ten years	25,082		22,814		7,653		7,624
Due after ten years	74,646		71,667		44,601		44,034
Total	$	277,911	$	265,092	$	55,454	$	54,838