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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]        
Related tax benefit (expense) for net unrealized gain (loss) on available-for-sale debt securities $ 10,086 $ 1,114 $ 13,950 $ (1,572)
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, tax 0 0 (19) 0
Related tax benefit (expense) for net unrealized gain (loss) on borrowing cash flow hedges (12,954) (16,230) (14,437) (20,857)
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, tax $ 0 $ 3,245 $ 0 $ 3,245