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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Components of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Subtotal	$ 1,207,901	$ 1,123,549
Less: Unearned Income	(3,035)	(2,556)
Allowance for Loan Losses	(15,520)	(15,312)	(13,317)	(11,016)
Loans, Net	1,189,346	1,105,681
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and Industrial Loans and Leases	335,373	293,172
Commercial Real Estate Loans	488,496	452,071
Agricultural Loans	179,906	167,693
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Home Equity Loans	74,437	77,070
Consumer Loans	41,103	47,409
Residential Mortgage Loans	$ 88,586	$ 86,134