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SECURITIES (Tables)
6 Months Ended
Mar. 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 March 31, 2020
Debt securities AFS    
SBA securities$168,697  $4,569  $(20) $173,246  
Obligations of states and political subdivisions858  14  —  872  
Non-bank qualified obligations of states and political subdivisions341,080  5,587  (497) 346,170  
Asset-backed securities339,135  —  (18,898) 320,237  
Mortgage-backed securities342,735  12,359  —  355,094  
Total debt securities AFS$1,192,505  $22,529  $(19,415) $1,195,619  

(Dollars in Thousands)Amortized CostGross Unrealized GainsGross Unrealized (Losses)Fair Value
At September 30, 2019
Debt securities AFS    
SBA securities$182,327  $3,655  $—  $185,982  
Obligations of states and political subdivisions858  16  —  874  
Non-bank qualified obligations of states and political subdivisions396,430  5,030  (903) 400,557  
Asset-backed securities 305,603  262  (3,331) 302,534  
Mortgage-backed securities378,670  5,731  (1,855) 382,546  
Total debt securities AFS$1,263,888  $14,694  $(6,089) $1,272,493  
Securities Held to Maturity
(Dollars in Thousands)Amortized CostGross Unrealized GainsGross Unrealized (Losses)Fair Value
At March 31, 2020
Debt securities HTM    
Non-bank qualified obligations of states and political subdivisions$108,105  $187  $(767) $107,525  
Mortgage-backed securities6,752  128  —  6,880  
Total debt securities HTM$114,857  $315  $(767) $114,405  

(Dollars in Thousands)Amortized CostGross Unrealized GainGross Unrealized (Losses)Fair Value
At September 30, 2019
Debt securities HTM    
Non-bank qualified obligations of states and political subdivisions$127,582  $108  $(1,403) $126,287  
Mortgage-backed securities7,182  14  (13) 7,183  
Total debt securities HTM$134,764  $122  $(1,416) $133,470  
Debt Securities, Trading, and Equity Securities, FV-NI
Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized 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 March 31, 2020
Debt securities AFS      
SBA securities$19,536  $(20) $—  $—  $19,536  $(20) 
Non-bank qualified obligations of states and political subdivisions27,484  (37) 46,259  (460) 73,743  (497) 
Asset-backed securities196,361  (7,499) 123,876  (11,399) 320,237  (18,898) 
Total debt securities AFS$243,381  $(7,556) $170,135  $(11,859) $413,516  $(19,415) 

 LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
At September 30, 2019
Debt securities AFS      
SBA securities$10,262  $—  $—  $—  $10,262  $—  
Non-bank qualified obligations of states and political subdivisions66,326  (177) 55,428  (726) 121,754  (903) 
Asset-backed securities158,176  (1,823) 93,259  (1,508) 251,435  (3,331) 
Mortgage-backed securities1,713  (1) 89,634  (1,854) 91,347  (1,855) 
Total debt securities AFS$236,477  $(2,001) $238,321  $(4,088) $474,798  $(6,089) 
Schedule of Unrealized Loss on Investments
LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
At March 31, 2020
Debt securities HTM      
Non-bank qualified obligations of states and political subdivisions$—  $—  $92,418  $(767) $92,418  $(767) 
Total debt securities HTM$—  $—  $92,418  $(767) $92,418  $(767) 

 LESS THAN 12 MONTHSOVER 12 MONTHSTOTAL
(Dollars in Thousands)Fair
Value
Unrealized
(Losses)
Fair
Value
Unrealized
(Losses)
Fair ValueUnrealized
(Losses)
At September 30, 2019
Debt securities HTM      
Non-bank qualified obligations of states and political subdivisions$5,967  $(6) $109,368  $(1,397) $115,335  $(1,403) 
Mortgage-backed securities1,471  —  1,803  (13) 3,274  (13) 
Total debt securities HTM$7,438  $(6) $111,171  $(1,410) $118,609  $(1,416) 
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 March 31, 2020  
Due in one year or less$1,130  $1,138  
Due after one year through five years12,689  13,067  
Due after five years through ten years45,180  47,086  
Due after ten years790,771  779,234  
 849,770  840,525  
Mortgage-backed securities342,735  355,094  
Total securities AFS, at fair value$1,192,505  $1,195,619  

(Dollars in Thousands)Amortized CostFair Value
At September 30, 2019
Due in one year or less$—  $—  
Due after one year through five years16,749  17,143  
Due after five years through ten years50,263  51,840  
Due after ten years818,206  820,964  
 885,218  889,947  
Mortgage-backed securities378,670  382,546  
Total securities AFS, at fair value$1,263,888  $1,272,493  

Securities HTM at Fair ValueAmortized CostFair Value
(Dollars in Thousands)
At March 31, 2020  
Due after ten years$108,105  $107,525  
 108,105  107,525  
Mortgage-backed securities6,752  6,880  
Total securities HTM, at cost$114,857  $114,405  
(Dollars in Thousands)Amortized CostFair Value
At September 30, 2019
Due after ten years$127,582  $126,287  
 127,582  126,287  
Mortgage-backed securities7,182  7,183  
Total securities HTM, at cost$134,764  $133,470