Business Combinations (Details) (First United Bancorp, Inc. [Member], USD $)	0 Months Ended
	May 08, 2014 Branch	May 08, 2014
Business Acquisition [Line Items]
Assets acquired		$ 1,700,000,000
Loans acquired		1,100,000,000
Deposits acquired		1,400,000,000
Number of branches acquired (in branch)	21
Common stock issued per share held		0.89
Value of transaction based on closing stock price		$ 312,000,000
Range Of Acceptable Share Price Without Adjustment [Member] | Minimum [Member]
Business Acquisition [Line Items]
Share price	$ 8.09	$ 8.09
Range Of Acceptable Share Price Without Adjustment [Member] | Maximum [Member]
Business Acquisition [Line Items]
Share price	$ 12.13	$ 12.13