Loans and Allowance for Loan Losses (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of activity related to our allowance for loan losses
Balance, beginning of period				$ 10,213				$ 9,091	$ 10,213	$ 9,091	$ 8,925
Provision	900	1,325	950	1,000	825	775	750	1,125	4,175	3,475	4,550
Loan charge-offs									(2,887)	(2,478)
Loan recoveries									251	125
Net loan charge-offs									(2,636)	(2,353)
Balance, end of period	11,752				10,213				11,752	10,213	9,091
Commercial Portfolio Segment [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period				8,239				7,981	8,239	7,981		8,061
Provision									2,445	2,444
Loan charge-offs									(2,714)	(2,303)
Loan recoveries									246	117
Net loan charge-offs									(2,468)	(2,186)
Balance, end of period	8,216				8,239				8,216	8,239		8,061
Consumer Portfolio Segment [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period				1,974				1,110	1,974	1,110		864
Provision									1,730	1,031
Loan charge-offs									(173)	(175)
Loan recoveries									5	8
Net loan charge-offs									(168)	(167)
Balance, end of period	3,536				1,974				3,536	1,974		864
Unallocated Financing Receivables [Member]
Summary of activity related to our allowance for loan losses
Balance, beginning of period
Provision
Loan charge-offs
Loan recoveries
Net loan charge-offs
Balance, end of period