Business Combinations (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Nov. 01, 2014	Dec. 31, 2013	Nov. 01, 2014 First United Bancorp, Inc. [Member]	Dec. 01, 2014 First United Bancorp, Inc. [Member] Branch	Nov. 01, 2014 First United Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Assets acquired								$ 1,700,000,000
Loans acquired								1,200,000,000
Deposits acquired								1,400,000,000
Number of branches acquired (in branch)							20
Common stock issued per share held								0.89
Value of transaction based on closing stock price								300,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares						30,700,000
Payments to Acquire Businesses, Gross	8,900,000
Common stock, shares authorized		332,023,233	332,023,233	100,000,000	232,023,233
Payments for Merger Related Costs		$ 480,000	$ 1,100,000