Employee Benefit Plans (Details) (USD $)	12 Months Ended					12 Months Ended																																																		12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Dec. 31, 2009	Dec. 31, 2012 Pension benefits	Dec. 31, 2011 Pension benefits	Dec. 31, 2010 Pension benefits	Dec. 31, 2012 Postretirement benefits	Dec. 31, 2011 Postretirement benefits	Dec. 31, 2010 Postretirement benefits	Dec. 31, 2012 Postretirement benefits Employees hired before January 1, 2003	Dec. 31, 2012 Postretirement benefits Employees hired on or after January 1, 2003	Dec. 31, 2012 Postretirement health benefits Employees retired before January 1, 1993	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Common Stock	Dec. 31, 2011 Common Stock	Dec. 31, 2012 Common Stock Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Common Stock Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Common Stock Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Common Stock Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Mutual Funds - Equity [Member]	Dec. 31, 2011 Mutual Funds - Equity [Member]	Dec. 31, 2012 Mutual Funds - Equity [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Mutual Funds - Equity [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Mutual Funds - Equity [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Mutual Funds - Equity [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Collateralized Mortgage Backed Securities [Member]	Dec. 31, 2011 Collateralized Mortgage Backed Securities [Member]	Dec. 31, 2012 Collateralized Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Collateralized Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Collateralized Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Collateralized Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 States and political subdivisions	Dec. 31, 2011 States and political subdivisions	Dec. 31, 2012 States and political subdivisions Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 States and political subdivisions Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 States and political subdivisions Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 States and political subdivisions Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Corporate Bond Securities [Member]	Dec. 31, 2011 Corporate Bond Securities [Member]	Dec. 31, 2012 Corporate Bond Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Corporate Bond Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Corporate Bond Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Corporate Bond Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Mutual Funds - Taxable Income [Member]	Dec. 31, 2011 Mutual Funds - Taxable Income [Member]	Dec. 31, 2012 Mutual Funds - Taxable Income [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Mutual Funds - Taxable Income [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Mutual Funds - Taxable Income [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Mutual Funds - Taxable Income [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Other Investments [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2009 Minimum [Member]	Dec. 31, 2012 Minimum [Member] Equity Securities	Dec. 31, 2012 Minimum [Member] Debt Securities [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2010 Maximum [Member]	Dec. 31, 2009 Maximum [Member]	Dec. 31, 2012 Maximum [Member] Equity Securities	Dec. 31, 2012 Maximum [Member] Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution per eligible employee, coverage basis, consecutive period of highest average monthly compensation												5 years
Contribution per eligible employee, coverage basis, lastest service period												10 years
Percentage of annual contribution per eligible employee													2.00%
Maximum coverage per eligible retiree														100.00%
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ 210,000
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan, Measurement Date	six months
Time Period of Lower Returns on Equity Securites	10 years
Defined Benefit Plan, Actual Plan Asset Allocations																																																							1.00%			60.00%	24.00%				75.00%	39.00%
Cash and Cash Equivalents, at Carrying Value	62,542,000	38,950,000	74,644,000		41,773,000	401,000	497,000
Accrued Investment Income Receivable						22,000	13,000
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months						2,293,000			32,000
Defined Benefit Plan, Actual Return on Plan Assets						1,271,000	(239,000)		0	0
Pension and Other Postretirement Defined Benefit Plans, Liabilities						(7,287,000)	(6,096,000)		(244,000)	(224,000)
Defined Benefit Plan, Service Cost						0	0	750,000	0	0	0
Defined Contribution Plan, Employer Matching Contribution, Percent																																																								0.00%	0.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent																																																								3.00%	3.00%			5.00%	2.00%	5.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	758,000	763,000	425,000
Components of net periodic benefit costs:
Interest cost						599,000	724,000	785,000	10,000	12,000	13,000
Expected return on plan assets						(756,000)	(1,033,000)	(1,149,000)	0	0	0
Net periodic benefit cost						840,000	581,000	564,000	8,000	3,000	1,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate						4.00%	5.40%	6.40%	4.00%	5.70%	6.40%
Defined Benefit Plan, Actuarial Gain (Loss)						1,863,000	5,175,000		42,000	11,000
Defined Benefit Plan, Benefits Paid						(169,000)	(205,000)		(86,000)	(103,000)
Defined Benefit Plan, Curtailments						0	0	23,000	0	0	0
Projected benefit obligation:
Beginning balance						16,505,000	12,501,000		224,000	231,000
Impact of settlements						(835,000)	(815,000)	0	0	0	0
Ending balance, after settlements						17,306,000	16,505,000	12,501,000	244,000	224,000	231,000
Fair value of plan assets:
Beginning balance	9,899,000					10,409,000	12,543,000		0	0					8,507,000	9,033,000	1,089,000	866,000	0	300,000	0	300,000	0	0	7,545,000	7,562,000	7,545,000	7,562,000	0	0	157,000	38,000	0	0	157,000	38,000	932,000	828,000	0	0	932,000	828,000	363,000	471,000	363,000	471,000	0	0	599,000	700,000	599,000	700,000	0	0
Impact of settlements						1,492,000	1,690,000		0	0
Ending balance, after settlements	9,596,000	9,899,000				10,019,000	10,409,000	12,543,000	0	0	0				8,507,000	9,033,000	1,089,000	866,000	0	300,000	0	300,000	0	0	7,545,000	7,562,000	7,545,000	7,562,000	0	0	157,000	38,000	0	0	157,000	38,000	932,000	828,000	0	0	932,000	828,000	363,000	471,000	363,000	471,000	0	0	599,000	700,000	599,000	700,000	0	0
Funded status, beginning balance						(6,096,000)			(224,000)
Funded status, ending balance						(7,287,000)	(6,096,000)		(244,000)	(224,000)
Short-term borrowings	47,769,000	51,643,000
Assumptions:
Discount rate				5.10%		3.30%	4.00%		3.30%	4.00%
Expected return on plan assets						7.50%	8.00%	8.50%
Defined Benefit Plan, Contributions by Employer						0	0		32,000	30,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet						(7,287,000)	(6,096,000)		(244,000)	(224,000)
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost Credit, after Tax						0	0		2,000	3,000
Pension and Other Postretirement Benefit Plans, Accumulated Othe Comprehensive Income (Loss), Net Gains (Losses), Net of Tax						6,260,000	6,032,000		15,000	42,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(6,238,000)	(6,027,000)	(2,415,000)		(3,581,000)	6,260,000	6,032,000		17,000	45,000
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)						0	0	4,000	0	0	(3,000)
Defined Benefit Plan, Amortization of Net Gains (Losses)						162,000	75,000	151,000	(2,000)	(9,000)	(9,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase								2.50%
Defined Benefit Plan, Expected Future Benefit Payments, Year Two						2,276,000			32,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three						1,106,000			32,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four						1,143,000			32,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five						917,000			32,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter						4,578,000			75,000
Total						$ 12,313,000			$ 235,000
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	.08