Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in fair value for financial instruments
Fair value, Ending balance	$ 11
Significant Unobservable Inputs (Level 3) [Member] | Securities Carried at Fair Value Total [Member]
Change in fair value for financial instruments
Fair value, Beginning balance			692
Purchases
Sale repayment			(692)
Payoff at par
Realized gain
Unrealized gain, net
Transfers in/and or out of Level 3
Fair value, Ending balance
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	23
Significant Unobservable Inputs (Level 3) [Member] | Loan Securities Carried at Fair Value [Member]
Change in fair value for financial instruments
Fair value, Beginning balance	5,309	11,981	1,661
Purchases			7,112
Sale repayment	(6,359)	(662)	(2,272)
Payoff at par		(8,748)
Realized gain	614		469
Unrealized gain, net	447	2,738	5,011
Transfers in/and or out of Level 3
Fair value, Ending balance	11	5,309	11,981
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date		$ 659