Securities (Details) (USD $)	12 Months Ended								3 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2013	Dec. 31, 2013 U.S. Treasury and other U.S. government obligations	Dec. 31, 2012 U.S. Treasury and other U.S. government obligations	Dec. 31, 2013 Government sponsored enterprise obligations	Dec. 31, 2012 Government sponsored enterprise obligations	Dec. 31, 2013 Mortgage-backed securities - government agencies	Dec. 31, 2012 Mortgage-backed securities - government agencies	Jun. 30, 2013 Obligations of states and political subdivisions	Dec. 31, 2013 Obligations of states and political subdivisions	Dec. 31, 2012 Obligations of states and political subdivisions	Dec. 31, 2012 Trust preferred securities of financial institutions
Securities available for sale
Securities available for sale, amortized cost	$ 377,383,000	$ 493,066,000	$ 110,000,000	$ 98,000,000	$ 138,094,000	$ 83,015,000	$ 176,524,000	$ 137,407,000		$ 68,448,000	$ 57,961,000	$ 1,000,000
Unrealized gains	9,245,000	4,487,000			1,623,000	2,789,000	1,391,000	3,594,000		1,473,000	2,844,000	18,000
Unrealized losses	188,000	7,522,000			1,872,000	56,000	5,222,000	120,000		428,000	12,000
Total securities available for sale, fair value	386,440,000	490,031,000	110,000,000	98,000,000	137,845,000	85,748,000	172,693,000	140,881,000		69,493,000	60,793,000	1,018,000
Securities available for sale sold									685,000
Loss on available for sale securities sold									5,000
Held to maturity securities	$ 0	$ 0
Number of securities sold	0