Loans Receivable and Allowance for Loan Losses (Summary of Loans, Allowances and Impairment Balances, by Class and Impairment Method) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Allowance for loan losses:
Individually evaluated for impairment	$ 6,112	$ 5,585
Collectively evaluated for impairment	17,822	17,525
Total allowance for loan losses	23,934	23,110
Loans receivable:
Loans evaluated individually	51,384	52,599
Loans evaluated collectively	1,750,861	1,698,273
Total loans receivable	1,802,245	1,750,872
Period used to analyze future loan losses	2 years
Commercial and industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,273	1,559
Collectively evaluated for impairment	6,641	6,619
Total allowance for loan losses	7,914	8,178
Loans receivable:
Loans evaluated individually	11,589	13,055
Loans evaluated collectively	454,342	434,089
Total loans receivable	465,931	447,144
Commercial tax-exempt [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	68	72
Total allowance for loan losses	68	72
Loans receivable:
Loans evaluated individually	0	0
Loans evaluated collectively	77,566	81,734
Total loans receivable	77,566	81,734
Owner occupied real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,500	1,366
Collectively evaluated for impairment	736	814
Total allowance for loan losses	2,236	2,180
Loans receivable:
Loans evaluated individually	6,984	5,822
Loans evaluated collectively	299,781	296,595
Total loans receivable	306,765	302,417
Commercial construction and land development [Member]
Allowance for loan losses:
Individually evaluated for impairment	2,339	1,660
Collectively evaluated for impairment	3,503	3,899
Total allowance for loan losses	5,842	5,559
Loans receivable:
Loans evaluated individually	11,972	11,669
Loans evaluated collectively	111,817	121,507
Total loans receivable	123,789	133,176
Commercial real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,640	4,161
Total allowance for loan losses	4,640	4,161
Loans receivable:
Loans evaluated individually	10,284	10,953
Loans evaluated collectively	502,298	462,235
Total loans receivable	512,582	473,188
Residential [Member]
Allowance for loan losses:
Individually evaluated for impairment	524	524
Collectively evaluated for impairment	499	436
Total allowance for loan losses	1,023	960
Loans receivable:
Loans evaluated individually	7,489	7,979
Loans evaluated collectively	91,338	89,787
Total loans receivable	98,827	97,766
Consumer [Member]
Allowance for loan losses:
Individually evaluated for impairment	476	476
Collectively evaluated for impairment	853	827
Total allowance for loan losses	1,329	1,303
Loans receivable:
Loans evaluated individually	3,066	3,121
Loans evaluated collectively	213,719	212,326
Total loans receivable	216,785	215,447
Unallocated [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	882	697
Total allowance for loan losses	882	697
Loans receivable:
Loans evaluated individually	0	0
Loans evaluated collectively	0	0
Total loans receivable	$ 0	$ 0