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Securities Available for Sale - Schedule of Gross Unrealized Losses on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Estimated Fair Value    
Less than 12 months $ 71,547 $ 94,612
12 months or more 27,897 543,401
Estimated Fair Value 99,444 638,013
Unrealized Losses    
Less than 12 months (103) (205)
12 months or more (23) (4,292)
Unrealized Losses (126) (4,497)
U.S. Treasury securities    
Estimated Fair Value    
Less than 12 months 0 0
12 months or more 0 44,729
Estimated Fair Value 0 44,729
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 (32)
Unrealized Losses 0 (32)
Mortgage-backed securities    
Estimated Fair Value    
Less than 12 months 71,547 94,612
12 months or more 27,897 474,979
Estimated Fair Value 99,444 569,591
Unrealized Losses    
Less than 12 months (103) (205)
12 months or more (23) (4,144)
Unrealized Losses (126) (4,349)
States and political subdivision securities    
Estimated Fair Value    
Less than 12 months 0 0
12 months or more 0 23,693
Estimated Fair Value 0 23,693
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 (116)
Unrealized Losses 0 (116)
Other    
Estimated Fair Value    
Less than 12 months 0 0
12 months or more 0 0
Estimated Fair Value 0 0
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 0
Unrealized Losses $ 0 $ 0