Merger and Acquisition Activity (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 14, 2012 Marathon State Bank	Jun. 01, 2012 Marathon State Bank
Cash purchase price				$ 5,505
Fair Value of Assets Acquired:
Cash and due from banks	13,800	20,332			20,392
Securities					50,547
Loans receivable	509,880	477,991			23,760
Short-term commercial paper and bankers' acceptances					11,713
Foreclosed assets
Premises and equipment, net	9,669	10,240			402
Core deposit intangible asset
Accrued interest receivable and other assets					550
Total fair value of assets acquired					107,364
Fair Value of Liabilities assumed:
Non-interest-bearing	102,644	89,819			23,255
Interest-bearing	474,870	475,623			77,611
Accrued expenses and other liabilities	7,052	6,493			142
Total fair value of liabilities assumed					101,008
Fair value of net assets acquired					6,356
Gain on bargain purchase		$ 851		$ 851