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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	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	$ 505,913
Derivative assets	2,200		7,652
Derivative liabilities	991		5,648
Loans held for sale	12,044	13,661	16,612
Mortgage servicing intangibles	638		915
US Treasury Securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	20,158
U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	404,522		459,566
Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	16,031		24,709
States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	51,929		60,538
Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	13,273		10,487
Level 1 Inputs [Member] \| US Treasury Securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	20,158
Level 2 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Derivative assets	2,200		7,652
Derivative liabilities	991		5,648
Loans held for sale	12,044		16,612
Level 2 Inputs [Member] \| U.S. Federal agencies securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	404,522		459,566
Level 2 Inputs [Member] \| Mortgage backed securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	16,031		24,709
Level 2 Inputs [Member] \| States and political subdivisions [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	51,929		60,538
Level 2 Inputs [Member] \| Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	3,446
Level 3 Inputs [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Mortgage servicing intangibles	638		915
Level 3 Inputs [Member] \| Other securities [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Securities available for sale	$ 9,827		$ 10,487

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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- Definition

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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