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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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