Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loan Receivables, Average) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Loans With No Related Allowance:
Average Recorded Investment	$ 32,925	$ 38,449	$ 34,964	$ 39,238
Interest Income Recognized	191	207	440	676
Loans With An Allowance Recorded:
Average Recorded Investment	10,575	23,532	12,296	20,697
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	43,500	61,981	47,260	59,935
Interest Income Recognized	191	207	440	676
Commercial and industrial [Member]
Loans With No Related Allowance:
Average Recorded Investment	8,964	9,501	8,310	9,320
Interest Income Recognized	129	47	205	121
Loans With An Allowance Recorded:
Average Recorded Investment	1,990	4,587	2,526	5,030
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	10,954	14,088	10,836	14,350
Interest Income Recognized	129	47	205	121
Commercial tax-exempt [Member]
Loans With No Related Allowance:
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Owner occupied real estate [Member]
Loans With No Related Allowance:
Average Recorded Investment	4,858	3,808	4,514	2,841
Interest Income Recognized	0	0	10	0
Loans With An Allowance Recorded:
Average Recorded Investment	1,909	1,399	1,973	1,418
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	6,767	5,207	6,487	4,259
Interest Income Recognized	0	0	10	0
Commercial construction and land development [Member]
Loans With No Related Allowance:
Average Recorded Investment	3,357	6,366	5,243	7,399
Interest Income Recognized	8	43	39	133
Loans With An Allowance Recorded:
Average Recorded Investment	3,142	8,848	4,256	8,168
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	6,499	15,214	9,499	15,567
Interest Income Recognized	8	43	39	133
Commercial real estate [Member]
Loans With No Related Allowance:
Average Recorded Investment	9,137	10,229	9,981	11,550
Interest Income Recognized	40	96	128	351
Loans With An Allowance Recorded:
Average Recorded Investment	0	5,129	0	4,486
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	9,137	15,358	9,981	16,036
Interest Income Recognized	40	96	128	351
Residential [Member]
Loans With No Related Allowance:
Average Recorded Investment	4,074	5,355	4,261	4,942
Interest Income Recognized	8	13	35	49
Loans With An Allowance Recorded:
Average Recorded Investment	3,069	3,091	3,072	1,381
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	7,143	8,446	7,333	6,323
Interest Income Recognized	8	13	35	49
Consumer [Member]
Loans With No Related Allowance:
Average Recorded Investment	2,535	3,190	2,655	3,186
Interest Income Recognized	6	8	23	22
Loans With An Allowance Recorded:
Average Recorded Investment	465	478	469	214
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	3,000	3,668	3,124	3,400
Interest Income Recognized	$ 6	$ 8	$ 23	$ 22