Loans and Allowance for Loan Losses (Allowance for Loans Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	$ 15,310	$ 18,805	$ 14,953	$ 16,025
Provision charged to expense	1,980	2,580	6,540	7,440
Losses charged off	(1,035)	(5,419)	(6,556)	(9,008)
Recoveries	401	145	1,719	1,654
Allowance, end of period	16,656	16,111	16,656	16,111
Allowance for loan losses, Individually evaluated for impairment	4,272	5,056	4,272	5,056	3,729
Allowance for loan losses, Collectively evaluated for impairment	12,384	11,055	12,384	11,055	11,224
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	987,327	1,014,966	987,327	1,014,966	996,340
Loans, Individually evaluated for impairment	64,817	79,212	64,817	79,212	67,562
Loans, Collectively evaluated for impairment	922,510	935,754	922,510	935,754	928,778
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	4,148	4,620	4,131	3,942
Provision charged to expense	(234)	1,764	701	1,891
Losses charged off	(88)	(1,341)	(1,594)	(1,672)
Recoveries	166	47	754	929
Allowance, end of period	3,992	5,090	3,992	5,090
Decrease during period of pool of loans collectively evaluated for impairment	9,952
Allowance for loan losses, Individually evaluated for impairment	1,165	2,350	1,165	2,350	1,750
Allowance for loan losses, Collectively evaluated for impairment	2,827	2,740	2,827	2,740	2,381
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	57,613	83,100	57,613	83,100	69,325
Loans, Individually evaluated for impairment	11,123	24,215	11,123	24,215	18,159
Loans, Collectively evaluated for impairment	46,490	58,885	46,490	58,885	51,166
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Other Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	4,776	4,102	4,073	2,763
Provision charged to expense	1,053	1,706	4,199	3,798
Losses charged off	(226)	(1,486)	(2,810)	(2,503)
Recoveries	147	12	288	276
Allowance, end of period	5,750	4,334	5,750	4,334
Allowance for loan losses, Individually evaluated for impairment	2,182	1,381	2,182	1,381	894
Allowance for loan losses, Collectively evaluated for impairment	3,568	2,953	3,568	2,953	3,179
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	496,862	520,804	496,862	520,804	505,180
Loans, Individually evaluated for impairment	44,305	45,918	44,305	45,918	40,770
Loans, Collectively evaluated for impairment	452,557	474,886	452,557	474,886	464,410
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	3,023	5,282	3,347	4,442
Provision charged to expense	580	(890)	631	908
Losses charged off	(188)	(1,132)	(667)	(2,227)
Recoveries	26	35	130	172
Allowance, end of period	3,441	3,295	3,441	3,295
Allowance for loan losses, Individually evaluated for impairment	450	614	450	614	485
Allowance for loan losses, Collectively evaluated for impairment	2,991	2,681	2,991	2,681	2,862
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	155,890	143,133	155,890	143,133	155,330
Loans, Individually evaluated for impairment	1,448	1,899	1,448	1,899	1,544
Loans, Collectively evaluated for impairment	154,442	141,234	154,442	141,234	153,786
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	2,792	3,682	2,607	3,701
Provision charged to expense	315	127	741	693
Losses charged off	(329)	(1,214)	(925)	(1,920)
Recoveries	14	9	369	130
Allowance, end of period	2,792	2,604	2,792	2,604
Allowance for loan losses, Individually evaluated for impairment	436	685	436	685	563
Allowance for loan losses, Collectively evaluated for impairment	2,356	1,919	2,356	1,919	2,044
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	234,825	223,884	234,825	223,884	223,839
Loans, Individually evaluated for impairment	7,802	7,034	7,802	7,034	6,924
Loans, Collectively evaluated for impairment	227,023	216,850	227,023	216,850	216,915
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	571	1,119	795	1,177
Provision charged to expense	266	(127)	268	150
Losses charged off	(204)	(246)	(560)	(686)
Recoveries	48	42	178	147
Allowance, end of period	681	788	681	788
Allowance for loan losses, Individually evaluated for impairment	39	26	39	26	37
Allowance for loan losses, Collectively evaluated for impairment	642	762	642	762	758
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	42,137	44,045	42,137	44,045	42,666
Loans, Individually evaluated for impairment	139	146	139	146	165
Loans, Collectively evaluated for impairment	41,998	43,899	41,998	43,899	42,501
Loans, Loans acquired with deteriorated credit quality	0	0	0	0	0
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance, beginning of period	0	0	0	0
Provision charged to expense	0	0	0	0
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Allowance, end of period	0	0	0	0
Allowance for loan losses, Individually evaluated for impairment	0	0	0	0	0
Allowance for loan losses, Collectively evaluated for impairment	0	0	0	0	0
Allowance for loan losses, Loans acquired with deteriorated credit quality	0	0	0	0	0
Loans, net of unearned income	0	0	0	0	0
Loans, Individually evaluated for impairment	0	0	0	0	0
Loans, Collectively evaluated for impairment	0	0	0	0	0
Loans, Loans acquired with deteriorated credit quality	$ 0	$ 0	$ 0	$ 0	$ 0