Junior Subordinated Notes - Additional Information (Detail) - USD ($)		3 Months Ended
	Mar. 15, 2005	Mar. 31, 2016
Subordinated Borrowing [Line Items]
Junior subordinated notes	$ 37,380,000
First interest payment date		Jun. 30, 2005
Trust preferred securities	$ 36,250,000
Junior Subordinated Notes
Subordinated Borrowing [Line Items]
Interest rate above prevailing three-month LIBOR rate		3.10%
Debt, maturity date		2035
Trust Preferred Securities
Subordinated Borrowing [Line Items]
Interest rate above prevailing three-month LIBOR rate		3.10%
Debt, maturity date		2035