Loans and Asset Quality Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Purchased impaired loans (substantially all of which are covered loans)
Balance, beginning, carrying value	$ 3,142	$ 4,825
Change due to payments received	(166)	(270)
Transfer to foreclosed real estate		(1,316)
Change due to loan charge-off		(96)
Other	312	(1)
Balance, ending, carrying value	3,288	3,142
Contractual Principal Receivable [Member]
Purchased impaired loans (substantially all of which are covered loans)
Balance, beginning, contractual principal	6,263	8,815
Change due to payments received	(269)	(301)
Transfer to foreclosed real estate		(2,100)
Change due to loan charge-off		(150)
Other	197	(1)
Balance, ending, contractual principal	6,191	6,263
Fair Value Adjustment Write Down [Member]
Purchased impaired loans (substantially all of which are covered loans)
Balance, beginning, FMV	3,121	3,990
Change due to payments received	(103)	(31)
Transfer to foreclosed real estate		(784)
Change due to loan charge-off		(54)
Other	(115)
Balance, ending, FMV	$ 2,903	$ 3,121