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	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Allowance for loan losses:
Individually evaluated for impairment	$ 5,964	$ 5,585
Collectively evaluated for impairment	18,576	17,525
Total allowance for loan losses	24,540	23,110
Loans receivable:
Loans evaluated individually	44,542	52,599
Loans evaluated collectively	1,869,078	1,698,273
Total loans receivable	1,913,620	1,750,872
Period used to analyze future loan losses	2 years
Commercial and industrial [Member]
Allowance for loan losses:
Individually evaluated for impairment	3,243	1,559
Collectively evaluated for impairment	6,741	6,619
Total allowance for loan losses	9,984	8,178
Loans receivable:
Loans evaluated individually	13,336	13,055
Loans evaluated collectively	465,269	434,089
Total loans receivable	478,605	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	75,986	81,734
Total loans receivable	75,986	81,734
Owner occupied real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,142	1,366
Collectively evaluated for impairment	830	814
Total allowance for loan losses	1,972	2,180
Loans receivable:
Loans evaluated individually	6,987	5,822
Loans evaluated collectively	305,045	296,595
Total loans receivable	312,032	302,417
Commercial construction and land development [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	1,660
Collectively evaluated for impairment	4,022	3,899
Total allowance for loan losses	4,022	5,559
Loans receivable:
Loans evaluated individually	3,876	11,669
Loans evaluated collectively	118,438	121,507
Total loans receivable	122,314	133,176
Commercial real estate [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,747	4,161
Total allowance for loan losses	4,747	4,161
Loans receivable:
Loans evaluated individually	10,523	10,953
Loans evaluated collectively	583,481	462,235
Total loans receivable	594,004	473,188
Residential [Member]
Allowance for loan losses:
Individually evaluated for impairment	1,114	524
Collectively evaluated for impairment	490	436
Total allowance for loan losses	1,604	960
Loans receivable:
Loans evaluated individually	6,843	7,979
Loans evaluated collectively	100,864	89,787
Total loans receivable	107,707	97,766
Consumer [Member]
Allowance for loan losses:
Individually evaluated for impairment	465	476
Collectively evaluated for impairment	901	827
Total allowance for loan losses	1,366	1,303
Loans receivable:
Loans evaluated individually	2,977	3,121
Loans evaluated collectively	219,995	212,326
Total loans receivable	222,972	215,447
Unallocated [Member]
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	778	697
Total allowance for loan losses	778	697
Loans receivable:
Loans evaluated individually	0	0
Loans evaluated collectively	0	0
Total loans receivable	$ 0	$ 0