Loans and Allowance for Loan Losses (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of activity related to our allowance for loan losses
Balance, beginning of period				$ 8,925				$ 8,386	$ 8,925	$ 8,386
Provision	950	1,125	1,275	1,200	2,225	1,670	650	725	4,550	5,270	5,610
Loan charge-offs									(4,505)	(4,938)
Loan recoveries									121	207
Net loan charge-offs									(4,384)	(4,731)
Balance, end of period	9,091				8,925				9,091	8,925	8,386
Commercial Portfolio Segment [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period				8,061				6,706	8,061	6,706
Provision									3,447	5,584
Loan charge-offs									(3,600)	(4,434)
Loan recoveries									73	205
Net loan charge-offs									(3,527)	(4,229)
Balance, end of period	7,981				8,061				7,981	8,061
Consumer Portfolio Segment [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period				864				1,447	864	1,447
Provision									1,103	(81)
Loan charge-offs									(905)	(504)
Loan recoveries									48	2
Net loan charge-offs									(857)	(502)
Balance, end of period	1,110				864				1,110	864
Unallocated Financing Receivables [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period								233		233
Provision										(233)
Loan charge-offs
Loan recoveries
Net loan charge-offs
Balance, end of period