Borrowings (Details) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Minimum [Member]
Debt Instrument [Line Items]
Outstanding borrowings	$ 173,017,000	$ 130,000,000
FHLB outstanding borrowings	110,000,000	110,000,000
FHLB advances on line of credit	63,017,000
Pledging and security agreement with FHLB	392,722,000	339,727,000
Remaining credit allowance for future borrowings	$ 219,705,000	$ 209,727,000
Interest rate on the line of credit	0.21%
Term notes fixed interest rates			3.17%	2.52%
Term notes weighted average interest rate	2.97%
Remaining maturities period			46 months	44 years