Short-Term Borrowings - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Line of credit			50.00%
Home equity lines of credit	$ 91,995,000		$ 91,995,000
Available line of credit	45,998,000		45,998,000
Line of credit outstanding	0		0	0
Line of credit with an unaffiliated financial institution	6,000,000		6,000,000
Total short-term borrowings	2,674,000		2,674,000	4,576,000
Line of credit, capacity drawn	71,776,000		71,776,000
Line of credit payment amount	500,000	500,000
Securities sold under repurchase agreements	674,000		674,000	1,576,000
Line of Credit
Short-term Debt [Line Items]
Total short-term borrowings	2,000,000		2,000,000	3,000,000
Stated interest rate	3.50%		3.50%
Line of credit, capacity drawn				3,000,000
Line of credit, remaining capacity	$ 2,000,000		$ 2,000,000