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BORROWINGS - Subordinated Notes (Details) - Subordinated Debt [Member] - Fixed-to-Floating Rate Subordinated Notes, 5.25 Percent, Due 2030 [Member] - USD ($)
$ in Millions
Sep. 15, 2025
Jun. 30, 2021
Sep. 30, 2020
Aug. 06, 2020
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 65.0  
Debt Instrument, Interest Rate, Stated Percentage       5.25%
Debt Instrument, Face Amount, Debt Issued, Percentage of Par       100.00%
Long-term Debt   $ 63.5    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Forecast [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 5.21%