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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended
	Jun. 30, 2013 Contracts	Jun. 30, 2012 Contracts	Jun. 30, 2013 Loans	Dec. 31, 2012 Loans	Jun. 30, 2013 Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Commercial, Industrial, and Agricultural [Member] Loans	Dec. 31, 2012 Commercial, Industrial, and Agricultural [Member] Loans	Jun. 30, 2013 Commercial, Industrial, and Agricultural [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Commercial, Industrial, and Agricultural [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Commercial Mortgages [Member] Loans	Dec. 31, 2012 Commercial Mortgages [Member] Loans	Jun. 30, 2013 Commercial Mortgages [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Commercial Mortgages [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Residential Real Estate [Member] Loans	Dec. 31, 2012 Residential Real Estate [Member] Loans	Jun. 30, 2013 Residential Real Estate [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Residential Real Estate [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Consumer [Member] Loans	Dec. 31, 2012 Consumer [Member] Loans	Jun. 30, 2013 Consumer [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Consumer [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Credit Cards [Member] Loans	Dec. 31, 2012 Credit Cards [Member] Loans	Jun. 30, 2013 Credit Cards [Member] Trouble Debt Restructuring [Member] Loans	Jun. 30, 2012 Credit Cards [Member] Trouble Debt Restructuring [Member] Loans
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	11	10	1	5	2	2	0	1	9	8	1	4	0	0	0	0	0	0	0	0	0	0	0	0
Pre-Modification Outstanding Recorded Investment					$ 346	$ 2,866			$ 0	$ 310			$ 346	$ 2,556			$ 0	$ 0			$ 0	$ 0			$ 0	$ 0
Post-Modification Outstanding Recorded Investment					$ 403	$ 2,866			$ 0	$ 310			$ 403	$ 2,556			$ 0	$ 0			$ 0	$ 0			$ 0	$ 0