Fair Value (Reconciliation of all Assets Measured at Fair Value on Recurring Basis, Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Obligations of State and Political Subdivisions [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance of Recurring Level 3 Assets	$ 11,439	$ 11,791	$ 12,169	$ 4,772
Total Gains or Losses (realized/unrealized) Included in Earnings	(12)	9	(162)	60
Maturities / Calls	(425)	0	(1,005)	(697)
Purchases	0	0	0	7,665
Ending Balance of Recurring Level 3 Assets	11,002	11,800	11,002	11,800
Equity Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance of Recurring Level 3 Assets	353	353	353	353
Total Gains or Losses (realized/unrealized) Included in Earnings	0	0	0	0
Maturities / Calls	0	0	0	0
Purchases	0	0	0	0
Ending Balance of Recurring Level 3 Assets	353	353	353	353
Corporate Securities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance of Recurring Level 3 Assets	0	0	0	1,005
Total Gains or Losses (realized/unrealized) Included in Earnings	0	0	0	0
Maturities / Calls	0	0	0	(1,005)
Purchases	0	0	0	0
Ending Balance of Recurring Level 3 Assets	$ 0	$ 0	$ 0	$ 0