Intangible Assets (Details 3) (USD $)			6 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Balance had error been corrected in prior period	Dec. 31, 2012 Error adjustment related to amortization method of MSR's	Jun. 30, 2013 Mortgage Service Rights	Jun. 30, 2012 Mortgage Service Rights	Jun. 30, 2013 Mortgage Service Rights	Jun. 30, 2012 Mortgage Service Rights	Dec. 31, 2012 Mortgage Service Rights	Jun. 30, 2013 Mortgage Service Rights Fair value option for mortgage servicing rights
Mortgage Servicing Rights
Cumulative effect of change in accounting principle as increase to retained earnings										$ 459,890
Mortgage loans serviced for others					323,203,000		323,203,000		310,587,000
Mortgage loan servicing fees reported as other non-interest income					243,000	219,000	459,000	426,000
Changes in mortgage servicing rights
Balance at beginning of year	2,873,000	2,549,000			2,689,000	2,747,000	2,549,000	2,308,000
Re-measurement to fair value upon election to measure servicing rights at fair value								742,000
Originated mortgage servicing rights					164,000	146,000	361,000	328,000
Changes in fair value:
Due to change in model inputs and assumptions					228,000	106,000	382,000	276,000
Other changes in fair value					(208,000)	(333,000)	(419,000)	(988,000)
Balance at end of year	2,873,000	2,549,000			2,873,000	2,666,000	2,873,000	2,666,000
Error correction, amortization of MSR's			$ 1,770,000	$ 538,000