Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loan Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Loans With No Related Allowance:
Recorded Investment	$ 35,399	$ 41,307
Unpaid Principal Balance	40,298	47,327
Loans With An Allowance Recorded:
Recorded Investment	11,074	11,292
Unpaid Principal Balance	11,074	11,292
Total Impaired Loans:
Recorded Investment	46,473	52,599
Unpaid Principal Balance	51,372	58,619
Related Allowance	5,589	5,585
Commercial and industrial [Member]
Loans With No Related Allowance:
Recorded Investment	9,347	9,838
Unpaid Principal Balance	10,106	12,587
Loans With An Allowance Recorded:
Recorded Investment	501	3,217
Unpaid Principal Balance	501	3,217
Total Impaired Loans:
Recorded Investment	9,848	13,055
Unpaid Principal Balance	10,607	15,804
Related Allowance	501	1,559
Commercial tax-exempt [Member]
Loans With No Related Allowance:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Total Impaired Loans:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Owner occupied real estate [Member]
Loans With No Related Allowance:
Recorded Investment	4,355	4,456
Unpaid Principal Balance	4,692	4,664
Loans With An Allowance Recorded:
Recorded Investment	2,312	1,366
Unpaid Principal Balance	2,312	1,366
Total Impaired Loans:
Recorded Investment	6,667	5,822
Unpaid Principal Balance	7,004	6,030
Related Allowance	1,476	1,366
Commercial construction and land development [Member]
Loans With No Related Allowance:
Recorded Investment	4,929	8,514
Unpaid Principal Balance	5,988	9,047
Loans With An Allowance Recorded:
Recorded Investment	4,727	3,155
Unpaid Principal Balance	4,727	3,155
Total Impaired Loans:
Recorded Investment	9,656	11,669
Unpaid Principal Balance	10,715	12,202
Related Allowance	2,612	1,660
Commercial real estate [Member]
Loans With No Related Allowance:
Recorded Investment	9,920	10,953
Unpaid Principal Balance	12,202	12,795
Total Impaired Loans:
Recorded Investment	9,920	10,953
Unpaid Principal Balance	12,202	12,795
Related Allowance	0	0
Residential [Member]
Loans With No Related Allowance:
Recorded Investment	4,218	4,901
Unpaid Principal Balance	4,419	5,366
Loans With An Allowance Recorded:
Recorded Investment	3,069	3,078
Unpaid Principal Balance	3,069	3,078
Total Impaired Loans:
Recorded Investment	7,287	7,979
Unpaid Principal Balance	7,488	8,444
Related Allowance	535	524
Consumer [Member]
Loans With No Related Allowance:
Recorded Investment	2,630	2,645
Unpaid Principal Balance	2,891	2,868
Loans With An Allowance Recorded:
Recorded Investment	465	476
Unpaid Principal Balance	465	476
Total Impaired Loans:
Recorded Investment	3,095	3,121
Unpaid Principal Balance	3,356	3,344
Related Allowance	$ 465	$ 476