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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	$ 515,641	$ 546,126
Derivative assets	2,211	3,521
Derivative liabilities	1,029	1,801
Loans held for sale	6,469	11,257
Mortgage servicing intangibles	568	754
U.S. treasuries [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	29,861
U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	387,285	456,044
States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	50,334	56,767
Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	15,483	13,391
Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	32,678	19,924
Level 1 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets
Derivative liabilities
Loans held for sale
Mortgage servicing intangibles
Level 1 Inputs [Member] | U.S. treasuries [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	29,861
Level 1 Inputs [Member] | U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 1 Inputs [Member] | States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 1 Inputs [Member] | Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 1 Inputs [Member] | Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 2 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets	2,211	3,521
Derivative liabilities	1,029	1,801
Loans held for sale	6,469	11,257
Mortgage servicing intangibles
Level 2 Inputs [Member] | U.S. treasuries [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 2 Inputs [Member] | U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	387,285	456,044
Level 2 Inputs [Member] | States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	50,334	56,767
Level 2 Inputs [Member] | Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	3,465	3,366
Level 2 Inputs [Member] | Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	13,262	19,924
Level 3 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets
Derivative liabilities
Loans held for sale
Mortgage servicing intangibles	568	754
Level 3 Inputs [Member] | U.S. treasuries [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 3 Inputs [Member] | U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 3 Inputs [Member] | States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
Level 3 Inputs [Member] | Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	12,018	10,025
Level 3 Inputs [Member] | Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	$ 19,416

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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