Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 Loan	Jun. 30, 2012 Loan	Jun. 30, 2013 Loan	Jun. 30, 2012 Loan	Dec. 31, 2012 Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	32	17	49	21	40
Term Modification	$ 2,400		$ 10,608
Rate Modification	0		0
Combination	0		92
Post-Modification Outstanding Balance	2,400	2,303	10,700	4,016	8,687
Defaulted restructured loans, number of loans	7		12
Defaulted Restructured loans, recorded investment	4,121		5,123
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3	5	6	5	5
Term Modification	493		2,603
Rate Modification	0		0
Combination	0		0
Post-Modification Outstanding Balance	493	557	2,603	557	557
Defaulted restructured loans, number of loans	1		3
Defaulted Restructured loans, recorded investment	831		1,159
Commercial Secured by Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	15	2	20	5	11
Term Modification	662		1,267
Rate Modification	0		0
Combination	0		0
Post-Modification Outstanding Balance	662	728	1,267	2,393	4,506
Defaulted restructured loans, number of loans	1		3
Defaulted Restructured loans, recorded investment	1,229		1,891
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	13	10	22	11	23
Term Modification	872		6,365
Rate Modification	0		0
Combination	0		92
Post-Modification Outstanding Balance	872	1,018	6,457	1,066	3,233
Defaulted restructured loans, number of loans	5		6
Defaulted Restructured loans, recorded investment	2,061		2,073
Real Estate Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1		1		1
Term Modification	373		373
Rate Modification	0		0
Combination	0		0
Post-Modification Outstanding Balance	$ 373		$ 373		$ 391