Loans and Loans Held for Sale - Summary of Nonperforming Assets of Defaulted TDRs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	7	1	14
Recorded Investment	$ 0	$ 1,002	$ 72	$ 1,217
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	1	0	1
Recorded Investment	0	75	0	75
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	1	0	1
Recorded Investment	0	435	0	435
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	0	0	0
Recorded Investment	0	0	0	0
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	4	1	7
Recorded Investment	0	450	72	514
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	0	1	0	5
Recorded Investment	$ 0	$ 42	$ 0	$ 193