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FHLB Advances and Other Borrowings - Maturity Dates of Outstanding FHLB Advances (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
FHLB advances    
Within 1 year $ 950,000 $ 1,680,000
1 to 3 years 750,000 300,000
3 to 5 years 400,000 200,000
More than 5 years 150,000 150,000
FHLB advances $ 2,250,000 $ 2,330,000