Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loan Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loans With No Related Allowance:
Recorded Investment	$ 38,209	$ 41,307
Unpaid Principal Balance	42,237	47,327
Loans With An Allowance Recorded:
Recorded Investment	13,175	11,292
Unpaid Principal Balance	13,551	11,292
Total Impaired Loans:
Recorded Investment	51,384	52,599
Unpaid Principal Balance	55,788	58,619
Related Allowance	6,112	5,585
Commercial and industrial [Member]
Loans With No Related Allowance:
Recorded Investment	8,505	9,838
Unpaid Principal Balance	9,057	12,587
Loans With An Allowance Recorded:
Recorded Investment	3,084	3,217
Unpaid Principal Balance	3,084	3,217
Total Impaired Loans:
Recorded Investment	11,589	13,055
Unpaid Principal Balance	12,141	15,804
Related Allowance	1,273	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	4,634	4,456
Unpaid Principal Balance	4,850	4,664
Loans With An Allowance Recorded:
Recorded Investment	2,350	1,366
Unpaid Principal Balance	2,350	1,366
Total Impaired Loans:
Recorded Investment	6,984	5,822
Unpaid Principal Balance	7,200	6,030
Related Allowance	1,500	1,366
Commercial construction and land development [Member]
Loans With No Related Allowance:
Recorded Investment	7,785	8,514
Unpaid Principal Balance	7,941	9,047
Loans With An Allowance Recorded:
Recorded Investment	4,187	3,155
Unpaid Principal Balance	4,563	3,155
Total Impaired Loans:
Recorded Investment	11,972	11,669
Unpaid Principal Balance	12,504	12,202
Related Allowance	2,339	1,660
Commercial real estate [Member]
Loans With No Related Allowance:
Recorded Investment	10,284	10,953
Unpaid Principal Balance	12,607	12,795
Total Impaired Loans:
Recorded Investment	10,284	10,953
Unpaid Principal Balance	12,607	12,795
Related Allowance	0	0
Residential [Member]
Loans With No Related Allowance:
Recorded Investment	4,411	4,901
Unpaid Principal Balance	4,925	5,366
Loans With An Allowance Recorded:
Recorded Investment	3,078	3,078
Unpaid Principal Balance	3,078	3,078
Total Impaired Loans:
Recorded Investment	7,489	7,979
Unpaid Principal Balance	8,003	8,444
Related Allowance	524	524
Consumer [Member]
Loans With No Related Allowance:
Recorded Investment	2,590	2,645
Unpaid Principal Balance	2,857	2,868
Loans With An Allowance Recorded:
Recorded Investment	476	476
Unpaid Principal Balance	476	476
Total Impaired Loans:
Recorded Investment	3,066	3,121
Unpaid Principal Balance	3,333	3,344
Related Allowance	$ 476	$ 476