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Long-Term Borrowings (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Long-term Debt [Abstract]
Residential mortgage, commercial real estate, and multi-family loans	$ 552.6	$ 280.2
Additional borrowing limit	308.8
Long-term investments	$ 2.3	$ 2.2	$ 2.1
Interest rate	4.49%
Debt interest rate payment description	The debt has a floating rate that is determined quarterly based on the three-month LIBOR
Debenture maturity date	Dec. 15, 2036
Fixed-rate constant payment advances
Long-term Debt [Abstract]
Federal Home Loan Bank interest rate	1.70%	1.70%

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- Definition

Additional federal home loan bank advances to be borrow under collateral pledge.

+ References

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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