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SECURITIES (Tables)
3 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Securities Available for Sale
The amortized cost, gross unrealized gains and losses and estimated fair values of available for sale ("AFS") and held to maturity ("HTM") debt securities are presented below.
(Dollars in Thousands)Amortized CostGross Unrealized GainsGross Unrealized (Losses)Fair Value
At December 31, 2020
Debt securities AFS    
SBA securities$156,929 $5,255 $(175)$162,009 
Obligations of states and political subdivisions2,823 17 — 2,840 
Non-bank qualified obligations of states and political subdivisions299,830 9,808 — 309,638 
Asset-backed securities323,589 2,752 (3,465)322,876 
Mortgage-backed securities418,390 12,685 (314)430,761 
Total debt securities AFS$1,201,561 $30,517 $(3,954)$1,228,124 

(Dollars in Thousands)Amortized CostGross Unrealized GainsGross Unrealized (Losses)Fair Value
At September 30, 2020
Debt securities AFS    
SBA securities$159,722 $5,391 $(158)$164,955 
Obligations of states and political subdivisions825 16 — 841 
Non-bank qualified obligations of states and political subdivisions314,819 8,978 (23)323,774 
Asset-backed securities 329,139 2,015 (6,229)324,925 
Mortgage-backed securities439,879 14,567 (839)453,607 
Total debt securities AFS$1,244,384 $30,967 $(7,249)$1,268,102 
Securities Held to Maturity
(Dollars in Thousands)Amortized CostGross Unrealized GainsGross Unrealized (Losses)Fair Value
At December 31, 2020
Debt securities HTM    
Non-bank qualified obligations of states and political subdivisions$76,176 $1,414 $— $77,590 
Mortgage-backed securities5,152 185 — 5,337 
Total debt securities HTM$81,328 $1,599 $— $82,927 

(Dollars in Thousands)Amortized CostGross Unrealized GainGross Unrealized (Losses)Fair Value
At September 30, 2020
Debt securities HTM    
Non-bank qualified obligations of states and political subdivisions$87,183 $1,040 $(29)$88,194 
Mortgage-backed securities5,427 124 — 5,551 
Total debt securities HTM$92,610 $1,164 $(29)$93,745 
Schedule of Unrealized Loss on Investments, AFS
Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous loss position, were as follows:

LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
At December 31, 2020
Debt securities AFS
SBA securities$40,938 $(81)$18,623 $(94)$59,561 $(175)
Asset-backed securities60,713 (136)200,240 (3,329)260,953 (3,465)
Mortgage-backed securities62,494 (314)— — 62,494 (314)
Total debt securities AFS$164,145 $(531)$218,863 $(3,423)$383,008 $(3,954)

LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
At September 30, 2020
Debt securities AFS
SBA securities$32,257 $(102)$9,875 $(56)$42,132 $(158)
Non-bank qualified obligations of states and political subdivisions6,265 (6)3,103 (17)9,368 (23)
Asset-backed securities106,474 (1,089)178,686 (5,140)285,160 (6,229)
Mortgage-backed securities138,338 (839)— — 138,338 (839)
Total debt securities AFS$283,334 $(2,036)$191,664 $(5,213)$474,998 $(7,249)

There were no debt securities HTM with a continuous loss position at December 31, 2020.
Schedule of Unrealized Loss on Investments, HTM
LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
At September 30, 2020
Debt securities HTM
Non-bank qualified obligations of states and political subdivisions7,397 (9)3,637 (20)11,034 (29)
Total debt securities HTM$7,397 $(9)$3,637 $(20)$11,034 $(29)
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity The amortized cost and fair value of debt securities by contractual maturity are shown below. Certain securities have call features that allow the issuer to call the security prior to maturity. Expected maturities may differ from contractual maturities in mortgage-backed securities ("MBS") because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, MBS are not included in the maturity categories in the following maturity summary. The expected maturities of certain SBA securities may differ from contractual maturities because the borrowers may have the right to prepay the obligation. However, certain prepayment penalties may apply.
Securities AFS at Fair ValueAmortized CostFair Value
(Dollars in Thousands)
At December 31, 2020  
Due in one year or less$720 $724 
Due after one year through five years22,799 23,707 
Due after five years through ten years32,099 33,738 
Due after ten years727,553 739,194 
 783,171 797,363 
Mortgage-backed securities418,390 430,761 
Total securities AFS, at fair value$1,201,561 $1,228,124 

(Dollars in Thousands)Amortized CostFair Value
At September 30, 2020
Due in one year or less$1,385 $1,398 
Due after one year through five years20,805 21,769 
Due after five years through ten years32,441 34,025 
Due after ten years749,874 757,303 
 804,505 814,495 
Mortgage-backed securities439,879 453,607 
Total securities AFS, at fair value$1,244,384 $1,268,102 

Securities HTM at Fair ValueAmortized CostFair Value
(Dollars in Thousands)
At December 31, 2020  
Due after ten years$76,176 $77,590 
 76,176 77,590 
Mortgage-backed securities5,152 5,337 
Total securities HTM, at cost$81,328 $82,927 

(Dollars in Thousands)Amortized CostFair Value
At September 30, 2020
Due after ten years$87,183 $88,194 
 87,183 88,194 
Mortgage-backed securities5,427 5,551 
Total securities HTM, at cost$92,610 $93,745