Loans Receivable and Allowance for Loan Losses (Summary of Nonaccrual Loans, by Type) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Period used to determine when a loan receivable is moved to nonaccrual status	90 days
Nonaccrual loans	$ 34,333	$ 39,963
Loans receivable, equal to greater than 90 days past due	23,060	21,701
Nonaccrual loans, unused commitment	0
Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	4,291	10,217
Loans receivable, equal to greater than 90 days past due	3,825	5,751
Commercial tax-exempt [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	0	0
Loans receivable, equal to greater than 90 days past due	0	0
Owner occupied real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	6,401	4,838
Loans receivable, equal to greater than 90 days past due	3,577	2,847
Commercial construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	9,028	8,587
Loans receivable, equal to greater than 90 days past due	3,650	5,239
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	5,793	6,705
Loans receivable, equal to greater than 90 days past due	5,830	4,837
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	6,341	7,039
Loans receivable, equal to greater than 90 days past due	4,867	1,916
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	2,479	2,577
Loans receivable, equal to greater than 90 days past due	$ 1,311	$ 1,111