Loans Receivable and Allowance for Loan Losses (Schedule of Impaired Loan Receivables, Average) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Loans With No Related Allowance:
Average Recorded Investment	$ 33,157	$ 40,285	$ 35,984	$ 39,633
Interest Income Recognized	114	226	249	470
Loans With An Allowance Recorded:
Average Recorded Investment	14,348	19,920	13,157	19,280
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	47,505	60,205	49,141	58,913
Interest Income Recognized	114	226	249	470
Commercial and industrial [Member]
Loans With No Related Allowance:
Average Recorded Investment	8,079	9,952	7,985	9,230
Interest Income Recognized	36	43	76	74
Loans With An Allowance Recorded:
Average Recorded Investment	2,341	5,312	2,793	5,251
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	10,420	15,264	10,778	14,481
Interest Income Recognized	36	43	76	74
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	3,896	2,764	4,341	2,358
Interest Income Recognized	0	0	10	0
Loans With An Allowance Recorded:
Average Recorded Investment	2,325	1,418	2,006	1,427
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	6,221	4,182	6,347	3,785
Interest Income Recognized	0	0	10	0
Commercial construction and land development [Member]
Loans With No Related Allowance:
Average Recorded Investment	4,133	7,806	6,187	7,915
Interest Income Recognized	14	45	31	90
Loans With An Allowance Recorded:
Average Recorded Investment	6,148	7,816	4,813	7,829
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	10,281	15,622	11,000	15,744
Interest Income Recognized	14	45	31	90
Commercial real estate [Member]
Loans With No Related Allowance:
Average Recorded Investment	10,035	11,557	10,403	12,210
Interest Income Recognized	40	111	88	256
Loans With An Allowance Recorded:
Average Recorded Investment	0	4,159	0	4,165
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	10,035	15,716	10,403	16,375
Interest Income Recognized	40	111	88	256
Residential [Member]
Loans With No Related Allowance:
Average Recorded Investment	4,218	4,901	4,353	4,736
Interest Income Recognized	14	19	27	36
Loans With An Allowance Recorded:
Average Recorded Investment	3,069	1,051	3,074	526
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	7,287	5,952	7,427	5,262
Interest Income Recognized	14	19	27	36
Consumer [Member]
Loans With No Related Allowance:
Average Recorded Investment	2,796	3,305	2,715	3,184
Interest Income Recognized	10	8	17	14
Loans With An Allowance Recorded:
Average Recorded Investment	465	164	471	82
Interest Income Recognized	0	0	0	0
Total Impaired Loans:
Average Recorded Investment	3,261	3,469	3,186	3,266
Interest Income Recognized	$ 10	$ 8	$ 17	$ 14