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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Securities Available For Sale: |  |
Securities available for sale | $ 700,531 | $ 737,311
Trading Securities: |  |
Trading securities | 4,358 | 4,459
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 70,509 | 54,169
Trading Securities: |  |
Trading securities | 4,153 | 4,300
Liabilities: |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 629,246 | 680,562
Trading Securities: |  |
Trading securities | 205 | 159
Liabilities: |  |
Interest rate swaps | (1,241) | (1,745)
Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 776 | 2,580
Trading Securities: |  |
Trading securities | 0 | 0
Liabilities: |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 700,531 | 737,311
Trading Securities: |  |
Trading securities | 4,358 | 4,459
Fair Value Measurement on Recurring Basis [Member] | U.S. Treasury [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 2,007 | 4,036
Fair Value Measurement on Recurring Basis [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 177,230 | 163,781
Trading Securities: |  |
Trading securities | 53 | 58
Fair Value Measurement on Recurring Basis [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 179,863 | 181,279
Fair Value Measurement on Recurring Basis [Member] | Residential and Multi Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 255,039 | 316,822
Fair Value Measurement on Recurring Basis [Member] | Commercial Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 950 | 1,304
Fair Value Measurement on Recurring Basis [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 14,157 | 15,024
Trading Securities: |  |
Trading securities | 152 | 101
Fair Value Measurement on Recurring Basis [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 776 | 600
Fair Value Measurement on Recurring Basis [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 69,513 | 52,927
Fair Value Measurement on Recurring Basis [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 996 | 1,538
Fair Value Measurement on Recurring Basis [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 2,998 | 3,117
Fair Value Measurement on Recurring Basis [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 253 | 408
Fair Value Measurement on Recurring Basis [Member] | International Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 257 | 287
Fair Value Measurement on Recurring Basis [Member] | Large Cap Growth Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 182 | 157
Fair Value Measurement on Recurring Basis [Member] | Money Market Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 86 | 110
Fair Value Measurement on Recurring Basis [Member] | Large Cap Value Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 121 | 104
Fair Value Measurement on Recurring Basis [Member] | Real Estate Investment Trust Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 40 | 65
Fair Value Measurement on Recurring Basis [Member] | Small Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 81 | 26
Fair Value Measurement on Recurring Basis [Member] | Mid Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 81 | 26
Fair Value Measurement on Recurring Basis [Member] | Interest Rate Swaps [Member] |  |
Liabilities: |  |
Interest rate swaps | (1,241) | (1,745)
Fair Value Measurement on Recurring Basis [Member] | Commodities Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 54 |
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 70,509 | 54,169
Trading Securities: |  |
Trading securities | 4,153 | 4,300
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential and Multi Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 69,513 | 52,631
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 996 | 1,538
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 2,998 | 3,117
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 253 | 408
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | International Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 257 | 287
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large Cap Growth Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 182 | 157
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 86 | 110
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large Cap Value Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 121 | 104
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real Estate Investment Trust Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 40 | 65
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 81 | 26
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mid Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 81 | 26
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member] |  |
Liabilities: |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 54 |
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 629,246 | 680,562
Trading Securities: |  |
Trading securities | 205 | 159
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 2,007 | 4,036
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 177,230 | 163,781
Trading Securities: |  |
Trading securities | 53 | 58
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 179,863 | 181,279
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential and Multi Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 255,039 | 316,822
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 950 | 1,304
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 14,157 | 13,044
Trading Securities: |  |
Trading securities | 152 | 101
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 296
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | International Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Large Cap Growth Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money Market Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Large Cap Value Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Real Estate Investment Trust Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Small Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mid Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swaps [Member] |  |
Liabilities: |  |
Interest rate swaps | (1,241) | (1,745)
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodities Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 |
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 776 | 2,580
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Residential and Multi Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 1,980
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 776 | 600
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | International Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Large Cap Growth Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Money Market Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Large Cap Value Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Real Estate Investment Trust Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Small Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mid Cap Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swaps [Member] |  |
Liabilities: |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodities Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | $ 0 |

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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 as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + 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 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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