Loans and Allowance for Loan Losses - Troubled Debt Restructuring Loan Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 contracts	Dec. 31, 2012 contracts
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	3	7
Pre-Modification Outstanding Recorded Investment	$ 93	$ 5,595
Post-Modification Outstanding Recorded Investment	93	5,114
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	3	11
Pre-Modification Outstanding Recorded Investment	236	1,167
Post-Modification Outstanding Recorded Investment	236	1,167
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	15	8
Pre-Modification Outstanding Recorded Investment	774	398
Post-Modification Outstanding Recorded Investment	774	398
Indirect Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	25
Pre-Modification Outstanding Recorded Investment	195
Post-Modification Outstanding Recorded Investment	195
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	3	1
Pre-Modification Outstanding Recorded Investment	34	61
Post-Modification Outstanding Recorded Investment	$ 34	$ 61