Loans (Troubled Debt Restructurings) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Balance at Restructure	$ 14,833	$ 2,316	$ 9,148
Balance at Year-end	11,215	2,188	7,750
Commercial and Industrial, Energy [Member]
Financing Receivable, Modifications [Line Items]
Balance at Restructure	528	0	0
Balance at Year-end	531	0	0
Commercial and Industrial, Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Balance at Restructure	6,334	1,602	191
Balance at Year-end	4,937	1,478	179
Commercial Real Estate, Buildings, Land and Other [Member]
Financing Receivable, Modifications [Line Items]
Balance at Restructure	7,964	714	7,519
Balance at Year-end	5,747	710	6,183
Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Balance at Restructure	0	0	969
Balance at Year-end	0	0	932
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Balance at Restructure	7	0	469
Balance at Year-end	$ 0	$ 0	$ 456