Loans held-for-sale in non-performing status (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 19,729	$ 1,092
Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	427	603
Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	0	0
Legacy [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	10	0
Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	14,669	489
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 4,623	$ 0