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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

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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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- 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. + 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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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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