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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (14,899)    
Transfer of HTM securities to AFS securities 0 $ 2,336 $ 0
Other comprehensive income (loss), before reclassifications - AFS Securities 13,578 10,804 (6,741)
Other comprehensive income (loss), before reclassifications - Cash Flow Hedges (21,458) (32,817) 6,981
Amount reclassified from AOCI - AFS Securities 0 0 0
Amount reclassified from AOCI - Cash Flow Hedges 6,274 438 515
Amount reclassified from AOCI, deferred income taxes (2,014) (141) (197)
Other comprehensive income (loss) - AFS Securities 13,578 13,140 (6,741)
Other comprehensive income (loss) - Cash Flow Hedges (15,184) (32,379) 7,496
Other comprehensive income (loss) (1,606) (19,239) 755
Reclassification of certain income tax effects related to adoption of ASU 2018-02     0
Ending Balance (16,505) (14,899)  
Unrealized Gains (Losses) on AFS Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 10,150 (2,990) 3,290
Transfer of HTM securities to AFS securities   2,336  
Reclassification of certain income tax effects related to adoption of ASU 2018-02     461
Ending Balance 23,728 10,150 (2,990)
Unrealized Gains (Losses) on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (25,049) 7,330 (372)
Transfer of HTM securities to AFS securities   0  
Reclassification of certain income tax effects related to adoption of ASU 2018-02     206
Ending Balance (40,233) (25,049) 7,330
AOCI [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (14,899) 4,340 2,918
Transfer of HTM securities to AFS securities   2,336  
Other comprehensive income (loss), before reclassifications (7,880) (22,013) 240
Amount reclassified from AOCI 6,274 438 515
Other comprehensive income (loss) (1,606) (19,239) 755
Reclassification of certain income tax effects related to adoption of ASU 2018-02     667
Ending Balance $ (16,505) $ (14,899) $ 4,340