Financing Activities (Narrative) (Details) (USD $)				0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended			12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Apr. 01, 2004	Mar. 16, 2011 ONB Capital Trust II [Member]	Jun. 30, 2012 ONB Capital Trust II [Member]	Jul. 31, 2002 ONB Capital Trust II [Member]	Oct. 07, 2011 Monroe Bancorp Capital Trust I [Member]	Oct. 31, 2006 Monroe Bancorp Capital Trust I [Member]	Sep. 14, 2012 Monroe Bancorp Statutory Trust II [Member]	Jun. 30, 2012 Monroe Bancorp Statutory Trust II [Member]	Jun. 30, 2007 Monroe Bancorp Statutory Trust II [Member]	Jun. 30, 2012 St. Joseph Capital Trust I [Member]	Jun. 30, 2012 St. Joseph Capital Trust I [Member]	Oct. 31, 2003 St. Joseph Capital Trust I [Member]	Jun. 30, 2012 St. Joseph Capital Trust II [Member]	Jun. 30, 2010 St. Joseph Capital Trust II [Member]	Jun. 30, 2005 St. Joseph Capital Trust II [Member]	Dec. 31, 2011 Subordinated Notes [Member] Monroe Bancorp [Member]
Debt Instrument [Line Items]
Weighted-average rates of Federal Home Loan Bank Advances	3.30%	3.30%
Percentage of borrowings collateralized by investment securities and residential real estate loans	145.00%
Subordinated notes																		$ 13,000,000
Percentage, acquisition of subordinated notes																		10.00%
Preferred securities						100,000,000		3,000,000			5,000,000			3,000,000			5,000,000
Liquidation amount of preferred securities, per share					$ 25
Cumulative annual distribution rate of preferred securities					8.00%											6.27%
Cumulative annual distribution rate of preferred securities per share					$ 2.00
Redemption of trust preferred securities				100,000,000									3,000,000
Date of redemption					Dec. 15, 2010
Expensed unamortized issuance costs	$ 3,000,000
Fixed rate of interest of preferred securities							7.15%		6.52%
Reference rate of the variable interest rate for preferred securities										three-month LIBOR plus 160 basis points		three-month LIBOR plus 305 basis			three-month LIBOR plus 175 basis points
Long-term capital lease obligation period, in years			25
Long-term capital lease obligation renewal period, in years			10
Maturity date					Apr. 15, 2032							Jul. 11, 2033			Mar. 17, 2035
Number of renewal options for 10 year period			1