Loans and Allowance for Loan Losses - Loans on Nonaccrual Status (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Nonaccrual Loans	$ 21,986	$ 27,796
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	7
Financing Receivable, Modifications, Pre-Modification Recorded Investment	93	5,595
Post-Modification Outstanding Recorded Investment	93	5,114
Total Nonaccrual Loans	11,241	16,349
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Nonaccrual Loans	289	472
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	11
Financing Receivable, Modifications, Pre-Modification Recorded Investment	236	1,167
Post-Modification Outstanding Recorded Investment	236	1,167
Total Nonaccrual Loans	5,231	5,622
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	15	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	774	398
Post-Modification Outstanding Recorded Investment	774	398
Total Nonaccrual Loans	4,464	4,293
Indirect Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	25
Financing Receivable, Modifications, Pre-Modification Recorded Investment	195
Post-Modification Outstanding Recorded Investment	195
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Nonaccrual Loans	443	711
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	34	61
Post-Modification Outstanding Recorded Investment	34	61
Total Nonaccrual Loans	$ 318	$ 349