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Investment Securities (Tables)
 12 Months Ended
Sep. 30, 2024
Investments [Abstract]  
Marketable Securities
Held to maturity and available for sale investment securities were as follows as of September 30, 2024 and 2023 (dollars in thousands):
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		ACL
September 30, 2024    
Held to Maturity    
U.S. Treasury and U.S. government agency securities$92,312 $70 $(4,197)$88,185 $— 
Mortgage-backed securities ("MBS"):    
U.S. government agencies49,481 174 (1,378)48,277 — 
Private label residential28,479 231 (980)27,730 55 
Municipal securities1,330 8 — 1,338 — 
Bank issued trust preferred securities495 — (18)477 5 
Total$172,097 $483 $(6,573)$166,007 $60 
Available for Sale    
U.S. government securities$3,934 $6 $(1)$3,939 
MBS: U.S. government agencies68,297 545 (524)68,318 
Total$72,231 $551 $(525)$72,257 
September 30, 2023
Held to Maturity    
U.S. Treasury and U.S. government agency securities$171,626 $— $(10,088)$161,538 
MBS:    
U.S. government agencies52,294 — (3,950)48,344 
Private label residential44,011 295 (2,611)41,695 
Municipal securities1,787 — (47)1,740 
Bank issued trust preferred securities500 — (51)449 
Total$270,218 $295 $(16,747)$253,766 
Available for Sale    
MBS: U.S. government agencies$43,132 $— $(1,361)$41,771 
Total$43,132 $— $(1,361)$41,771 
Unrealized Gain (Loss) on Investments
Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2024 (dollars in thousands):
 Less Than 12 Months12 Months or LongerTotal
 Estimated
 Fair
 Value		Gross
Unrealized
Losses		QtyEstimated
 Fair
 Value		Gross
Unrealized
Losses		QtyEstimated
 Fair
 Value		Gross
Unrealized
Losses
Held to Maturity        
U.S. Treasury and U.S. government agency securities$— $— — $78,363 $(4,197)17 $78,363 $(4,197)
MBS:        
U.S. government agencies
1 — 1 28,618 (1,378)44 28,619 (1,378)
Private label residential
804 (6)1 20,447 (974)19 21,251 (980)
Bank issued trust preferred securities— — — 477 (18)1 477 (18)
     Total
$805 $(6)2 $127,905 $(6,567)81 $128,710 $(6,573)
Available for Sale        
U.S. government securities$1,962 $(1)1 $— $— — $1,962 $(1)
MBS: U.S. government agencies11,368 (117)4 25,751 (407)23 37,119 (524)
     Total$13,330 $(118)5$25,751 $(407)23 $39,081 $(525)

Held to maturity and available for sale investment securities with unrealized losses were as follows as of September 30, 2023 (dollars in thousands):
Less Than 12 Months12 Months or LongerTotal
 Estimated
 Fair
 Value		Gross
Unrealized
Losses		QtyEstimated
 Fair
 Value		Gross
Unrealized
Losses		QtyEstimated
 Fair
 Value		Gross
Unrealized
Losses
Held to Maturity        
U.S. Treasury and U.S. government agency securities$9,455 $(129)1 $152,082 $(9,959)26 $161,537 $(10,088)
MBS:        
U.S. government agencies
16,432 (549)13 31,703 (3,401)51 48,135 (3,950)
Private label residential
1,288 (2)1 38,205 (2,609)32 39,493 (2,611)
Municipal securities— — — 1,740 (47)1 1,740 (47)
Bank issued trust preferred securities— — — 449 (51)1 449 (51)
     Total
$27,175 $(680)15 $224,179 $(16,067)111 $251,354 $(16,747)
Available for Sale        
MBS:
U.S. government agencies
$10,635 $(308)3 $30,809 $(1,053)27 $41,444 $(1,361)
     Total
$10,635 $(308)3 $30,809 $(1,053)27 $41,444 $(1,361)
Other than Temporary Impairment, Credit Losses Recognized in Earnings
Schedule of Contractual Maturities of Debt Securities
The contractual maturities of debt securities at September 30, 2024 are as follows (dollars in thousands). Expected maturities may differ from scheduled maturities due to the prepayment of principal or call provisions.

 Held to MaturityAvailable for Sale
 Amortized
Cost		Estimated
Fair
Value		Amortized
Cost		Estimated
Fair
Value
Due within one year$27,472 $27,262 $3,934 $3,939 
Due after one year to five years81,840 77,870 2,131 2,130 
Due after five years to ten years1,250 1,277 5,160 5,144 
Due after ten years61,535 59,598 61,006 61,044 
Total$172,097 $166,007 $72,231 $72,257 
Summary of Credit Loss by Portfolio Segment
The following table sets forth information for the year ended September 30, 2024 regarding activity in the ACL by portfolio segment (dollars in thousands):

Year Ended September 30, 2024
Held to MaturityBeginning AllowanceImpact of Adopting CECL (ASU 2016-13)Provision for (Recapture of ) Credit LossesEnding Allowance
MBS:
Private label residential$— $82 $(27)$55 
Bank issued trust preferred securities— 10 (5)5 
Total$— $92 $(32)$60 
Summary of Held to Maturity Investment Securities by Risk
The following table sets forth the Company's held to maturity investment securities at September 30, 2024 by credit quality indicator (dollars in thousands):

Credit Ratings
As of September 30, 2024AAA/AA/ABBB/BB/BUnratedTotal
Held to Maturity
U.S. Treasury and U.S. government agency securities$92,312 $— $— $92,312 
MBS:
U.S. government agencies49,481 — — 49,481 
Private label securities16,277 — 12,202 28,479 
Municipal securities1,230 — 100 1,330 
Bank issued trust preferred securities— — 495 495 
Total held to maturity$159,300 $— $12,797 $172,097 
Schedule of Significant Inputs Utilized to Measure Estimate of Credit Loss Component on OTTI Securities
The following table represents a roll forward of the credit loss component of held to maturity investment securities that have been written down for OTTI with the credit loss component recognized in earning for the years ended September 30, 2024, 2023 and 2022 (dollars in thousands):

 202420232022
Balance, beginning of year$816 $836 $853 
Subtractions:  
       Net realized gain (losses) previously recorded
          as credit losses
(2)(11)1 
Recovery of prior credit loss(11)(9)(18)
Balance, end of year$803 $816 $836