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	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Allowance for loan losses:
Individually evaluated for impairment	$ 5,589	$ 5,585
Collectively evaluated for impairment	18,682	17,525
Total allowance for loan losses	24,271	23,110
Loans receivable:
Loans evaluated individually	46,473	52,599
Loans evaluated collectively	1,805,342	1,698,273
Total loans receivable	1,851,815	1,750,872
Period used to analyze future loan losses	2 years
Commercial and industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	501	1,559
Collectively evaluated for impairment	6,599	6,619
Total allowance for loan losses	7,100	8,178
Loans receivable:
Loans evaluated individually	9,848	13,055
Loans evaluated collectively	457,739	434,089
Total loans receivable	467,587	447,144
Commercial tax-exempt [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	67	72
Total allowance for loan losses	67	72
Loans receivable:
Loans evaluated individually	0	0
Loans evaluated collectively	76,674	81,734
Total loans receivable	76,674	81,734
Owner occupied real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,476	1,366
Collectively evaluated for impairment	757	814
Total allowance for loan losses	2,233	2,180
Loans receivable:
Loans evaluated individually	6,667	5,822
Loans evaluated collectively	302,041	296,595
Total loans receivable	308,708	302,417
Commercial construction and land development [Member]
Allowance for loan losses:
Individually evaluated for impairment	2,612	1,660
Collectively evaluated for impairment	4,084	3,899
Total allowance for loan losses	6,696	5,559
Loans receivable:
Loans evaluated individually	9,656	11,669
Loans evaluated collectively	120,793	121,507
Total loans receivable	130,449	133,176
Commercial real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,840	4,161
Total allowance for loan losses	4,840	4,161
Loans receivable:
Loans evaluated individually	9,920	10,953
Loans evaluated collectively	534,624	462,235
Total loans receivable	544,544	473,188
Residential [Member]
Allowance for loan losses:
Individually evaluated for impairment	535	524
Collectively evaluated for impairment	526	436
Total allowance for loan losses	1,061	960
Loans receivable:
Loans evaluated individually	7,287	7,979
Loans evaluated collectively	96,277	89,787
Total loans receivable	103,564	97,766
Consumer [Member]
Allowance for loan losses:
Individually evaluated for impairment	465	476
Collectively evaluated for impairment	868	827
Total allowance for loan losses	1,333	1,303
Loans receivable:
Loans evaluated individually	3,095	3,121
Loans evaluated collectively	217,194	212,326
Total loans receivable	220,289	215,447
Unallocated [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	941	697
Total allowance for loan losses	941	697
Loans receivable:
Loans evaluated individually	0	0
Loans evaluated collectively	0	0
Total loans receivable	$ 0	$ 0