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SUBORDINATED DEBT - Summary of Pertinent Information Related to Junior Subordinated Debentures (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Subordinated Borrowing [Line Items]  
Junior Subordinated Debt Owed to Trusts $ 11,341,000
Junior Subordinated Debt | 3 month LIBOR  
Subordinated Borrowing [Line Items]  
Interest rate, period end 0.23364%
Junior Subordinated Debt | Farmers & Merchants Capital Trust II  
Subordinated Borrowing [Line Items]  
Issuance Date Nov. 13, 2003
Trust Preferred Securities Outstanding $ 7,500,000
Junior Subordinated Debt Owed to Trusts $ 7,732,000
Maturity Date Nov. 08, 2033 [1]
Junior Subordinated Debt | Farmers & Merchants Capital Trust II | 3 month LIBOR  
Subordinated Borrowing [Line Items]  
Basis spread on variable rate 3.00% [2]
Junior Subordinated Debt | Farmers & Merchants Capital Trust III  
Subordinated Borrowing [Line Items]  
Issuance Date Jun. 30, 2005
Trust Preferred Securities Outstanding $ 3,500,000
Junior Subordinated Debt Owed to Trusts $ 3,609,000
Maturity Date Jul. 07, 2035 [1]
Junior Subordinated Debt | Farmers & Merchants Capital Trust III | 3 month LIBOR  
Subordinated Borrowing [Line Items]  
Basis spread on variable rate 1.80% [2]
[1]

All debentures are currently callable.

[2]

The 3-month LIBOR in effect as of December 31, 2020 was 0.23364%.