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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 44,871 $ 36,377 $ 83,822 $ 104,243
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) during the period on available-for-sale investment securities, net of tax (3,729) 11,617 5,262 9,893
Reclassification adjustment of net (gain) loss from sale of available-for-sale securities included in net income, net of tax 0 (11,572) 0 (11,572)
Other comprehensive income (loss) on available-for-sale securities, net of tax (3,729) 45 5,262 (1,679)
Net unrealized gain (loss) during the period on borrowings cash flow hedges, net of tax 54,335 (9,570) 69,826 (7,152)
Reclassification adjustment of net (gain) loss included in net income during the period from hedging derivatives, net of tax (10,865) 0 (10,865) 0
Other comprehensive income (loss) on borrowing cash flow hedges, net of tax 43,470 (9,570) 58,961 (7,152)
Other comprehensive income (loss) 39,741 (9,525) 64,223 (8,831)
Comprehensive income $ 84,612 $ 26,852 $ 148,045 $ 95,412