Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loan Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Loans With No Related Allowance:
Recorded Investment	$ 34,897	$ 41,307
Unpaid Principal Balance	36,601	47,327
Loans With An Allowance Recorded:
Recorded Investment	9,645	11,292
Unpaid Principal Balance	9,645	11,292
Total Impaired Loans:
Recorded Investment	44,542	52,599
Unpaid Principal Balance	46,246	58,619
Related Allowance	5,964	5,585
Commercial and industrial [Member]
Loans With No Related Allowance:
Recorded Investment	8,367	9,838
Unpaid Principal Balance	9,136	12,587
Loans With An Allowance Recorded:
Recorded Investment	4,969	3,217
Unpaid Principal Balance	4,969	3,217
Total Impaired Loans:
Recorded Investment	13,336	13,055
Unpaid Principal Balance	14,105	15,804
Related Allowance	3,243	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	5,845	4,456
Unpaid Principal Balance	6,208	4,664
Loans With An Allowance Recorded:
Recorded Investment	1,142	1,366
Unpaid Principal Balance	1,142	1,366
Total Impaired Loans:
Recorded Investment	6,987	5,822
Unpaid Principal Balance	7,350	6,030
Related Allowance	1,142	1,366
Commercial construction and land development [Member]
Loans With No Related Allowance:
Recorded Investment	3,876	8,514
Unpaid Principal Balance	3,876	9,047
Loans With An Allowance Recorded:
Recorded Investment	0	3,155
Unpaid Principal Balance	0	3,155
Total Impaired Loans:
Recorded Investment	3,876	11,669
Unpaid Principal Balance	3,876	12,202
Related Allowance	0	1,660
Commercial real estate [Member]
Loans With No Related Allowance:
Recorded Investment	10,523	10,953
Unpaid Principal Balance	10,644	12,795
Total Impaired Loans:
Recorded Investment	10,523	10,953
Unpaid Principal Balance	10,644	12,795
Related Allowance	0	0
Residential [Member]
Loans With No Related Allowance:
Recorded Investment	3,774	4,901
Unpaid Principal Balance	4,014	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	6,843	7,979
Unpaid Principal Balance	7,083	8,444
Related Allowance	1,114	524
Consumer [Member]
Loans With No Related Allowance:
Recorded Investment	2,512	2,645
Unpaid Principal Balance	2,723	2,868
Loans With An Allowance Recorded:
Recorded Investment	465	476
Unpaid Principal Balance	465	476
Total Impaired Loans:
Recorded Investment	2,977	3,121
Unpaid Principal Balance	3,188	3,344
Related Allowance	$ 465	$ 476