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DEBT - Aggregate amount of maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
DEBT    
Long-term debt $ 170,323 $ 25,052
First Internet Bank of Indiana    
DEBT    
2022 550  
2023 363  
2024 412  
2025 869  
2026 270  
Thereafter 131,673  
Long-term debt $ 134,137