Long-Term Borrowings - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 trust_preferred_security
Debt Instrument [Line Items]
Period allowed for deferral of interest payment on the trust preferred securities (up to)	60 months
Trust Preferred Securities
Debt Instrument [Line Items]
Number of trust preferred securities acquired	11
Life of debt securities and trust preferred securities	30 years
Debt Securities
Debt Instrument [Line Items]
Life of debt securities and trust preferred securities	30 years