Credit Quality and Related Allowance for Loan Losses (Details 5) (USD $)	3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended					3 Months Ended					3 Months Ended			3 Months Ended
	Mar. 31, 2014 quarter component class	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Commercial and agricultural	Mar. 31, 2013 Commercial and agricultural	Dec. 31, 2013 Commercial and agricultural	Mar. 31, 2014 Residential	Mar. 31, 2013 Residential	Dec. 31, 2013 Residential	Mar. 31, 2014 Residential Financing receivable Owners of rental properties	Mar. 31, 2013 Residential Financing receivable Owners of rental properties	Mar. 31, 2014 Commercial	Mar. 31, 2013 Commercial	Dec. 31, 2013 Commercial	Mar. 31, 2014 Commercial Financing receivable Owners of rental properties	Mar. 31, 2013 Commercial Financing receivable Owners of rental properties	Mar. 31, 2014 Construction	Mar. 31, 2013 Construction	Dec. 31, 2013 Construction	Mar. 31, 2014 Installment loans to individuals	Mar. 31, 2013 Installment loans to individuals	Dec. 31, 2013 Installment loans to individuals	Mar. 31, 2014 Unallocated	Mar. 31, 2013 Unallocated	Dec. 31, 2013 Unallocated	Mar. 31, 2014 Purchased loans	Jun. 01, 2013 Purchased loans
Activity in the allowance
The total number of components that represents the allowance for loan losses	2
The number of classes that groups of loans are collectively evaluated for impairment	2
Period considered for quarter moving average which is a factor to calculate historical charge-off	12
Allowance for loan losses																										$ 0	$ 0
Changes in allowance
Beginning Balance	10,144,000	7,617,000		474,000	361,000		3,917,000	1,954,000				4,079,000	3,831,000				741,000	950,000		139,000	144,000		794,000	377,000
Charge-offs	(2,134,000)	(159,000)		0	0		(56,000)	(134,000)				(2,038,000)	0				0	0		(40,000)	(25,000)		0	0
Recoveries	25,000	872,000		3,000	2,000		2,000	1,000				0	1,000				0	850,000		20,000	18,000		0	0
Provision for loan losses	485,000	500,000		60,000	205,000		(801,000)	951,000				1,283,000	(73,000)				54,000	(986,000)		42,000	7,000		(153,000)	396,000
Ending Balance	8,520,000	8,830,000		537,000	568,000		3,062,000	2,772,000				3,324,000	3,759,000				795,000	814,000		161,000	144,000		641,000	773,000
Concentration of loans (as a percent)										15.87%	19.03%				13.18%	13.08%
Allowance for Loan Losses:
Individually evaluated for impairment	3,226,000		2,555,000	216,000		224,000	54,000		65,000			2,848,000		2,153,000			108,000		113,000	0		0	0		0
Collectively evaluated for impairment	5,294,000		7,589,000	321,000		250,000	3,008,000		3,852,000			476,000		1,926,000			687,000		628,000	161,000		139,000	641,000		794,000
Total ending allowance balance	8,520,000	8,830,000		537,000	568,000		3,062,000	2,772,000				3,324,000	3,759,000				795,000	814,000		161,000	144,000		641,000	773,000
Loans:
Individually evaluated for impairment	12,770,000		10,160,000	522,000		532,000	797,000		881,000			10,422,000		7,707,000			1,029,000		1,040,000	0		0
Loans acquired with deteriorated credit quality	866,000		868,000	0		0	352,000		354,000			514,000		514,000			0		0	0						866,000
Collectively evaluated for impairment	807,884,000		808,187,000	107,792,000		104,497,000	402,145,000		398,546,000			264,870,000		274,255,000			14,975,000		16,242,000	18,102,000		14,647,000
Total	$ 821,520,000		$ 819,215,000	$ 108,314,000		$ 105,029,000	$ 403,294,000		$ 399,781,000			$ 275,806,000		$ 282,476,000			$ 16,004,000		$ 17,282,000	$ 18,102,000		$ 14,647,000