Borrowings (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Borrowings (Textual)
Capital securities, Description	On September 15, 2005, RST II, a wholly-owned subsidiary of the Company, closed a pooled private offering of 10,000 Capital Securities with a liquidation amount of $1,000 per security. The proceeds of the offering were loaned to the Company in exchange for junior subordinated debentures with terms similar to the Capital Securities. Distributions on the Capital Securities are payable quarterly at a variable rate that is based upon the 3-month LIBOR plus 1.80 percent and are included in interest expense in the consolidated financial statements. These securities may be included in Tier 1 capital (with certain limitations applicable) under current regulatory guidelines and interpretations.
Advances from Federal Home Loan Banks	$ 26,500	$ 35,000
Minimum [Member]
Borrowings (Textual)
Interest rate	0.74%
Maximum [Member]
Borrowings (Textual)
Interest rate	1.96%

- Definition

Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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