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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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]        
Net income $ 49,359 $ 44,871 $ 99,640 $ 83,822
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax (33,767) (3,729) (46,701) 5,262
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax 0 0 62 0
Net unrealized gain (loss) from investment securities, net of reclassification adjustment (33,767) (3,729) (46,639) 5,262
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax 43,369 54,335 48,332 69,826
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, net of tax 0 (10,865) 0 (10,865)
Net unrealized gain (loss) in cash flow hedging instruments, net of reclassification adjustment 43,369 43,470 48,332 58,961
Other comprehensive income (loss) 9,602 39,741 1,693 64,223
Comprehensive income $ 58,961 $ 84,612 $ 101,333 $ 148,045