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BORROWINGS (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 08, 2017 | Jul. 14, 2006 | Dec. 07, 2005 | Dec. 31, 2020 | Dec. 31, 2019
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
FHLB advances, pledged as collateral |  |  |  | $ 499,800,000 | $ 437,800,000
Available collateral to borrow an additional amount from FHLB |  |  |  | $ 499,800,000 |
Subordinated Debt |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Debt instrument face amount | $ 25,000,000 |  |  |  |
Maturity date | Mar. 15, 2027 |  |  |  |
Interest rate | 6.25% |  |  |  |
Description of periodic payment | semi-annually on March 15 and September 15 of each year through March 15, 2022 and quarterly thereafter on March 15, June 15, September 15 and December 15 of each year |  |  |  |
Subordinated Debt | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Basis spread on LIBOR variable rate | 4.26% |  |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Description of periodic payment |  |  |  | 20 consecutive quarterly payments |
Period for periodic payment |  |  |  | 5 years |
Metbank Capital Trust I [Member] |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Investment in common securities of the trust |  |  | $ 310,000 |  |
Trust preferred securities issued |  |  | 10,000,000 |  |
Metbank Capital Trust I [Member] | Junior Subordinated Debt [Member] |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Debt instrument face amount |  |  | $ 10,300,000 |  |
Maturity date |  |  | Dec. 09, 2035 |  |
Description of LIBOR rate basis |  |  | three-month LIBOR |  |
Interest rate during period |  |  |  | 2.09% | 3.84%
Metbank Capital Trust I [Member] | Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Basis spread on LIBOR variable rate |  |  | 1.85% |  |
Metbank Capital Trust Two [Member] |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Investment in common securities of the trust |  | $ 310,000 |  |  |
Trust preferred securities issued |  | 10,000,000 |  |  |
Metbank Capital Trust Two [Member] | Junior Subordinated Debt [Member] |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Debt instrument face amount |  | $ 10,300,000 |  |  |
Maturity date |  | Oct. 07, 2036 |  |  |
Description of LIBOR rate basis |  | 3-month LIBOR |  |  |
Interest rate during period |  |  |  | 2.24% | 3.99%
Metbank Capital Trust Two [Member] | Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Federal Home Loan Bank, Advances [Line Items] |  |  |  |  |
Basis spread on LIBOR variable rate |  | 2.00% |  |  |

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