Financing Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended			9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013 Item	Sep. 30, 2013 St Joseph Capital Trust II [Member]	Dec. 31, 2012 St Joseph Capital Trust II [Member]	Mar. 31, 2010 St Joseph Capital Trust II [Member]	Mar. 31, 2005 St Joseph Capital Trust II [Member]	Oct. 07, 2011 Monroe Bancorp Capital Trust I [Member]	Jul. 31, 2006 Monroe Bancorp Capital Trust I [Member]	Jun. 15, 2012 Monroe Bancorp Statutory Trust II [Member]	Oct. 07, 2011 Monroe Bancorp Statutory Trust II [Member]	Mar. 31, 2007 Monroe Bancorp Statutory Trust II [Member]	Sep. 30, 2006 Home Federal Statutory Trust I [Member]	Mar. 31, 2013 Federal Home Loan Bank Advances [Member]	Sep. 30, 2013 Federal Home Loan Bank Advances [Member]	Dec. 31, 2012 Federal Home Loan Bank Advances [Member]	Mar. 31, 2013 Federal Home Loan Bank Advance One [Member] Pre Restructuring [Member]	Mar. 31, 2013 Federal Home Loan Bank Advance One [Member] Post Restructuring [Member]	Mar. 31, 2013 Federal Home Loan Bank Advance Two [Member] Pre Restructuring [Member]	Mar. 31, 2013 Federal Home Loan Bank Advance Two [Member] Post Restructuring [Member]
Proforma Debt Instrument [Line Items]
Weighted-average rates of Federal Home Loan Bank advances													0.84%	3.07%
Percentage of borrowings collateralized by investment securities and residential real estate loans														145.00%
Federal Home Loan Bank advances terminated	$ 1.0												$ 50.0
Advances from Federal Home Loan Banks restructured												33.4
FHLB advances effective interest rate															3.27%	3.29%	2.04%	2.49%
Preferred securities					$ 5.0		$ 3.0			$ 5.0	$ 15.0
Cumulative annual distribution rate of preferred securities				6.27%
Reference rate of the variable interest rate for preferred securities			Three-month LIBOR plus 175 basis points						Three-month LIBOR plus 160 basis points		Three-month LIBOR plus 165 basis points
Variable interest rate for preferred securities, Maturity date		Mar. 17, 2035
Fixed rate of interest of preferred securities						7.15%		6.52%
Long-term capital lease obligation period, in years	25 years
Long-term capital lease obligation renewal period, in years	10 years
Number of renewal options for 10 year period	1