Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Impaired originated loans [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Valuation Technique(s)	Market approach	Market approach
Unobservable Input(s)	Adjustment for differences between the comparable sales	Adjustment for differences between the comparable sales
Impaired originated loans [Member] | Minimum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(35.10%)	(35.10%)
Impaired originated loans [Member] | Maximum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	11.10%	22.00%
Impaired originated loans [Member] | Weighted Average [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(1.70%)	(2.00%)
Purchased other impaired loan [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Valuation Technique(s)	Market approach	Market approach
Unobservable Input(s)	Adjustment for differences between the comparable sales	Adjustment for differences between the comparable sales
Purchased other impaired loan [Member] | Minimum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(5.00%)	(5.00%)
Purchased other impaired loan [Member] | Maximum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	0.00%	0.00%
Purchased other impaired loan [Member] | Weighted Average [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(2.50%)	(2.50%)
Other real estate [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Valuation Technique(s)	Market approach	Market approach
Unobservable Input(s)	Adjustment for differences between the comparable sales	Adjustment for differences between the comparable sales
Other real estate [Member] | Minimum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(47.70%)	(47.70%)
Other real estate [Member] | Maximum [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	5.00%	5.00%
Other real estate [Member] | Weighted Average [Member]
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Range (Weighted Average)	(22.60%)	(27.60%)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Originated Loans Fair Value Disclosure	$ 12,119	$ 14,420
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Fair value	1,190	2,391
Other Impaired Purchased Loans Fair Value Disclosure	4,985	1,170
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Originated Loans Fair Value Disclosure	12,119	14,420
Fair value measurements for financial instruments measured at fair value on a non-recurring basis
Fair value	1,190	2,391
Other Impaired Purchased Loans Fair Value Disclosure	$ 4,985	$ 1,170