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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance     $ (145,633)       $ (145,633)  
Other comprehensive income (loss), before reclassifications - AFS Securities $ (10,765)     $ (31,117)     19,062 $ (107,544)
Other comprehensive income (loss), before reclassifications - Cash Flow Hedges 4,369     3,798     3,589 17,127
Amount reclassified from AOCI - AFS Securities 0     0     0 0
Amount reclassified from AOCI - Cash Flow Hedges (1,667)     1,301     (3,724) 4,797
Amount reclassified from AOCI, deferred income taxes 538     (420)     1,202 (1,548)
Other comprehensive income (loss) - AFS Securities (10,765)     (31,117)     19,062 (107,544)
Other comprehensive income (loss) - Cash Flow Hedges 2,702     5,099     (135) 21,924
Other comprehensive income (loss) (8,063) $ 13,959 13,031 (26,018) $ (52,581) $ (7,021)    
Ending balance (126,706)           (126,706)  
Unrealized Gains (Losses) on AFS Securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance (125,292)   (155,119) (71,776)   4,651 (155,119) 4,651
Ending balance (136,057) (125,292)   (102,893) (71,776)   (136,057) (102,893)
Unrealized Gains (Losses) on Cash Flow Hedges [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance 6,649   9,486 (4,131)   (20,956) 9,486 (20,956)
Ending balance 9,351 6,649   968 (4,131)   9,351 968
AOCI [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance (118,643)   (145,633) (75,907)   (16,305) (145,633) (16,305)
Other comprehensive income (loss), before reclassifications (6,396)     (27,319)     22,651 (90,417)
Amount reclassified from AOCI (1,667)     1,301     (3,724) 4,797
Other comprehensive income (loss) (8,063) 13,959 $ 13,031 (26,018) (52,581) $ (7,021) 18,927 (85,620)
Ending balance $ (126,706) $ (118,643)   $ (101,925) $ (75,907)   $ (126,706) $ (101,925)