BORROWINGS (Detail Textuals) - USD ($)				12 Months Ended
	Mar. 08, 2017	Jul. 14, 2006	Dec. 07, 2005	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, pledged as collateral				$ 263,400,000	$ 204,400,000
Available collateral to borrow an additional amount from FHLB				$ 221,200,000
Subordinated Debt
Federal Home Loan Bank, Advances [Line Items]
Aggregate principal amount of debentures	$ 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
Redemption price, percentage	100.00%
Subordinated Debt | London Interbank Offered Rate (LIBOR)
Federal Home Loan Bank, Advances [Line Items]
Basis spread on LIBOR variable rate	4.26%
Floating Rate Junior Subordinated Debentures (the "Debentures")
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, Delaware statutory trust ("Trust I")
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, Delaware statutory trust ("Trust I") | Floating Rate Junior Subordinated Debentures (the "Debentures")
Federal Home Loan Bank, Advances [Line Items]
Aggregate principal amount of debentures			$ 10,310,000
Maturity date			Dec. 09, 2035
Interest rate			6.82%
Term of interest rate			5 years
Description of LIBOR rate			3-month LIBOR
Callable period			5 years
Interest rate during period				3.21%	2.73%
MetBank Capital Trust I, Delaware statutory trust ("Trust I") | Floating Rate Junior Subordinated Debentures (the "Debentures") | London Interbank Offered Rate (LIBOR)
Federal Home Loan Bank, Advances [Line Items]
Basis spread on LIBOR variable rate			1.85%
MetBank Capital Trust II, a Delaware statutory trust ("Trust II")
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 II, a Delaware statutory trust ("Trust II") | Floating Rate Junior Subordinated Debentures (the "Debentures")
Federal Home Loan Bank, Advances [Line Items]
Aggregate principal amount of debentures		$ 10,310,000
Maturity date		Oct. 07, 2036
Interest rate		7.61%
Term of interest rate		5 years
Description of LIBOR rate		3-month LIBOR
Callable period		5 years
Interest rate during period				3.36%	2.88%
MetBank Capital Trust II, a Delaware statutory trust ("Trust II") | Floating Rate Junior Subordinated Debentures (the "Debentures") | London Interbank Offered Rate (LIBOR)
Federal Home Loan Bank, Advances [Line Items]
Basis spread on LIBOR variable rate		2.00%