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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	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	$ 462,427
Derivative assets	3,049		4,175
Derivative liabilities	1,886		1,868
Loans held for sale	4,934	11,257	13,384
Mortgage servicing intangibles	595		844
US Treasury Securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	360,904		433,131
Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	33,956		22,390
States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	53,386		57,829
Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	14,181		10,356
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] | US Treasury Securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale
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] | Mortgage backed 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 2 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets	3,049		4,175
Derivative liabilities	1,886		1,868
Loans held for sale	4,934		13,384
Mortgage servicing intangibles
Level 2 Inputs [Member] | US Treasury Securities [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	340,904		413,131
Level 2 Inputs [Member] | Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	14,455		22,390
Level 2 Inputs [Member] | States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	53,386		57,829
Level 2 Inputs [Member] | Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	3,421
Level 3 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets
Derivative liabilities
Loans held for sale
Mortgage servicing intangibles	595		844
Level 3 Inputs [Member] | US Treasury Securities [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	20,000		20,000
Level 3 Inputs [Member] | Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	19,501
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	$ 10,760		$ 10,356

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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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