Financing Activities - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended		9 Months Ended		3 Months Ended	12 Months Ended						0 Months Ended	9 Months Ended		0 Months Ended		0 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2014 Item	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Senior Unsecured Notes [Member]	Aug. 31, 2014 Senior Unsecured Notes [Member]	Mar. 31, 2013 Federal Home Loan Bank Advances [Member]	Dec. 31, 2013 Federal Home Loan Bank Advances [Member]	Sep. 30, 2014 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]	Mar. 31, 2010 St Joseph Capital Trust II [Member]	Sep. 30, 2014 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]	Sep. 30, 2014 Monroe Bancorp Statutory Trust II [Member]	Mar. 31, 2007 Monroe Bancorp Statutory Trust II [Member]	Sep. 30, 2006 Home Federal Statutory Trust I [Member]	Sep. 30, 2014 Home Federal Statutory Trust I [Member]	Sep. 30, 2006 Home Federal Statutory Trust I [Member]	Dec. 31, 2005 Tower Capital Trust 2 [Member]	Sep. 30, 2014 Tower Capital Trust 2 [Member]	Dec. 31, 2005 Tower Capital Trust 2 [Member]	Dec. 31, 2006 Tower Capital Trust 3 [Member]	Sep. 30, 2014 Tower Capital Trust 3 [Member]	Dec. 31, 2006 Tower Capital Trust 3 [Member]
Debt Instrument [Line Items]
Senior unsecured notes					$ 175,000,000
Fixed rate					4.125%
Maturity date				Aug. 15, 2024										Mar. 17, 2035
Weighted-average rates of Federal Home Loan Bank advances							0.94%	0.80%
Percentage of borrowings collateralized by investment securities and residential real estate loans								145.00%
Extinguishment of debt amount							50,000,000
Loss on extinguishment of debt		1,000,000
Advances from Federal Home Loan Banks restructured						33,400,000
FHLB advances effective interest rate									3.27%	2.04%	3.29%	2.49%
Preferred securities															$ 5,000,000		$ 3,000,000				$ 5,000,000			$ 15,000,000			$ 8,000,000			$ 9,000,000
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			Three-month LIBOR plus 134 basis points			Three-month LIBOR plus 169 basis
LIBOR rate														1.75%					1.60%			1.65%			1.34%			1.69%
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 option for 10 years period	1