Loans (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Commercial [Member] | Real Estate [Member]
Impaired Financing Receivable With No Related Allowance [Abstract]
Recorded balance	$ 3,011	$ 5,005	$ 3,011	$ 5,005	$ 5,341
Unpaid principal balance	4,075	7,224	4,075	7,224	6,354
Average investment in impaired loans	3,503	5,765	3,762	6,165	5,384
Interest income recognized	29	61	69	109	248
Impaired Financing Receivable With Related Allowance [Abstract]
Recorded balance	206	518	206	518	208
Unpaid principal balance	206	518	206	518	947
Specific allowance	100	43	100	43	100
Average investment in impaired loans	206	259	207	173	211
Interest income recognized	3		6		12
Impaired Financing Receivables Total [Abstract]
Recorded balance, total	3,217	5,523	3,217	5,523	5,549
Unpaid principal balance, total	4,281	7,742	4,281	7,742	7,301
Average investment in impaired loans, total	3,709	6,024	3,969	6,338	5,595
Interest income recognized, total	32	61	75	109	260
Commercial [Member] | Construction and Development [Member]
Impaired Financing Receivable With No Related Allowance [Abstract]
Recorded balance	2,890	3,082	2,890	3,082	3,632
Unpaid principal balance	5,618	5,992	5,618	5,992	7,078
Average investment in impaired loans	3,418	3,755	3,685	4,531	4,884
Interest income recognized	26	17	34	33	30
Impaired Financing Receivable With Related Allowance [Abstract]
Recorded balance	3,966	6,509	3,966	6,509	4,639
Unpaid principal balance	6,127	7,050	6,127	7,050	5,157
Specific allowance	690	1,296	690	1,296	959
Average investment in impaired loans	3,975	6,684	4,001	6,742	5,230
Interest income recognized	2	16	8	27	78
Impaired Financing Receivables Total [Abstract]
Recorded balance, total	6,856	9,591	6,856	9,591	8,271
Unpaid principal balance, total	11,745	13,042	11,745	13,042	12,235
Average investment in impaired loans, total	7,393	10,439	7,686	11,273	10,114
Interest income recognized, total	28	33	42	60	108
Commercial [Member] | Other [Member]
Impaired Financing Receivable With No Related Allowance [Abstract]
Recorded balance	916	3,119	916	3,119	972
Unpaid principal balance	1,216	3,119	1,216	3,119	972
Average investment in impaired loans	926	3,380	942	3,679	2,828
Interest income recognized	5	42	8	83	117
Impaired Financing Receivable With Related Allowance [Abstract]
Recorded balance	434	1,204	434	1,204	912
Unpaid principal balance	634	1,204	634	1,204	912
Specific allowance	235	318	235	318	257
Average investment in impaired loans	534	1,212	660	1,215	921
Interest income recognized	3	13	9	25	30
Impaired Financing Receivables Total [Abstract]
Recorded balance, total	1,350	4,323	1,350	4,323	1,884
Unpaid principal balance, total	1,850	4,323	1,850	4,323	1,884
Average investment in impaired loans, total	1,460	4,592	1,602	4,894	3,749
Interest income recognized, total	8	55	17	108	147
Residential Mortgage [Member]
Impaired Financing Receivable With No Related Allowance [Abstract]
Recorded balance	2,578	3,267	2,578	3,267	2,583
Unpaid principal balance	3,517	4,355	3,517	4,355	3,522
Average investment in impaired loans	2,722	3,579	2,851	4,179	3,755
Interest income recognized	19	20	38	51	58
Impaired Financing Receivable With Related Allowance [Abstract]
Recorded balance	306	531	306	531	834
Unpaid principal balance	306	531	306	531	834
Specific allowance	21	36	21	36	57
Average investment in impaired loans	307	532	307	534	654
Interest income recognized			3
Impaired Financing Receivables Total [Abstract]
Recorded balance, total	2,884	3,798	2,884	3,798	3,417
Unpaid principal balance, total	3,823	4,886	3,823	4,886	4,356
Average investment in impaired loans, total	3,029	4,111	3,158	4,713	4,409
Interest income recognized, total	$ 19	$ 20	$ 41	$ 51	$ 58