Short-Term Borrowings and Long-Term Debt Subordinated Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2012 subsidiarytrusts	Dec. 31, 2012 Junior Subordinated Debt [Member]	Dec. 31, 2012 Junior Subordinated Debt [Member] Columbia Bancorp Statutory Trust [Member]	Dec. 31, 2012 Junior Subordinated Debt [Member] Columbia Bancorp Statutory Trust II [Member]	Dec. 31, 2012 Junior Subordinated Debt [Member] Columbia Bancorp Statutory Trust III [Member]	Dec. 31, 2012 Junior Subordinated Debt [Member] Fulton Capital Trust I [Member]	May 31, 2007 Subordinated Debt [Member] May 2017 Subordinated Debt [Member]	Mar. 31, 2005 Subordinated Debt [Member] April 2015 Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Number Of Subsidiary Trusts Owned By Parent	4
Subordinated Borrowing, Interest Rate			2.96%	2.20%	2.08%	6.29%
Subordinated Debt		$ 171,136	$ 6,186	$ 4,124	$ 6,186	$ 154,640	$ 100,000	$ 100,000
Subordinated Borrowing, Due Date			Jun. 30, 2034	Mar. 15, 2035	Jun. 15, 2035	Feb. 01, 2036
Debt Instrument, Call Date, Earliest			Mar. 31, 2013	Mar. 15, 2013	Mar. 15, 2013
Subordinated Borrowing Callable Price			1.000	1.000	1.000
Subordinated Debt [Abstract]
Subordinated Debt Term							10 years	10 years
Debt Instrument, Interest Rate, Stated Percentage							5.75%	5.35%
Debt Instrument, Interest Rate, Effective Percentage							5.96%	5.49%