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BORROWINGS - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 07, 2022
Jun. 23, 2016
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
FHLB advances     $ 25,950,000 $ 25,950,000 $ 30,900,000
Federal funds purchased       0 0
Federal funds, maximum borrowings       87,200,000  
Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity       $ 25,000,000  
Percent of capital stock used as collateral       100.00%  
Line of Credit | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate       250.00%  
Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
FHLB advances       $ 25,950,000  
FHLB, amount available       68,352,000  
Federal Home Loan Bank Advances | Commercial          
Debt Instrument [Line Items]          
Debt instrument, collateral amount       66,623,000  
Federal Home Loan Bank Advances | Residential          
Debt Instrument [Line Items]          
Debt instrument, collateral amount       22,673,000  
Federal Home Loan Bank Advances | Home Equity Line of Credit          
Debt Instrument [Line Items]          
Debt instrument, collateral amount       $ 5,006,000  
Subordinated Debt          
Debt Instrument [Line Items]          
Interest rate, stated percentage       6.625%  
Subordinated Debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate       5.412%  
Subordinated Debt | Subordinated Notes due July 2026          
Debt Instrument [Line Items]          
Face amount $ 48,000 $ 4,500,000      
Interest rate, stated percentage 3.50% 6.625%      
Debt issuance costs, gross   $ 79,000 79,000    
Debt issuance costs, net $ 875,000   $ 846,000 $ 0 $ 7,000
Amortization period   60 months 60 months    
Subordinated Debt | Subordinated Notes due July 2026 | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.05% 5.412% 5.412%