Borrowings - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014 Subsequent Event [Member]	Dec. 31, 2013 Repurchase Agreements [Member]	Dec. 31, 2012 Repurchase Agreements [Member]	Dec. 31, 2013 Callable FHLB Borrowings [Member]	Dec. 31, 2012 Callable FHLB Borrowings [Member]	Dec. 31, 2013 Non-Callable FHLB Borrowings [Member]	Dec. 31, 2012 Non-Callable FHLB Borrowings [Member]	Dec. 31, 2013 Hudson Valley Bank [Member] Institution
Debt Instrument [Line Items]
Short-term borrowings	$ 34,379,000	$ 34,624,000			$ 34,379,000	$ 34,624,000
Short-term borrowings maturity period	1 year	1 year
Total other borrowings	16,388,000	16,428,000					15,000,000	15,000,000	1,300,000	1,300,000
Borrowing maturity date							2016		2027
Borrowing maturity period							10 years	10 years	30 years	30 years
Prepaid and short-term FHLB borrowings	200,000,000			16,400,000
FHLB prepayment penalty				1,900,000
Interest expense on borrowings	751,000	826,000	2,028,000
Loans and securities estimated fair value	50,767,000	51,226,000
Amounts outstanding with the FHLB	0
Unsecured borrowing total											75,000,000
Certificate of deposit agreements, total											1,000,000,000
Number of major financial institutions											3
Line of credit outstanding											0
Balances outstanding with federal reserve	0
Loan and investment securities total	$ 556,000,000