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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 85,183 | $ 74,967 |
Interest-bearing deposits | 3,881 | 3,511 |
Securities available for sale | 1,130,822 | 1,142,776 |
Other investments | 32,479 | 39,796 |
Loans held for sale | 0 | 13,412 |
Loans | 4,214,299 | 4,043,643 | 3,973,723
Deposits | 4,494,434 | 4,504,684 |
Short-term borrowings | 461,770 | 312,777 |
Long-term debt | 74,721 | 101,664 |
Subordinated debt | 105,750 | 105,750 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 0 | 0 |
Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 32,479 | 39,796 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Other investments | 0 | 0 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 85,183 | 74,967 |
Interest-bearing deposits | 3,881 | 3,511 |
Securities available for sale | 1,130,822 | 1,142,776 |
Other investments | 32,479 | 39,796 |
Loans held for sale |  | 13,412 |
Loans | 4,214,299 | 4,043,643 |
Deposits | 4,494,434 | 4,504,684 |
Short-term borrowings | 461,770 | 312,777 |
Long-term debt | 74,721 | 101,664 |
Subordinated debt | 105,750 | 105,750 |
Estimated Fair Value [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 85,183 | 74,967 |
Interest-bearing deposits | 3,881 | 3,511 |
Securities available for sale | 1,130,822 | 1,142,776 |
Other investments | 32,479 | 39,796 |
Loans held for sale |  | 13,412 |
Loans | 4,269,822 | 4,113,525 |
Deposits | 4,435,555 | 4,452,235 |
Short-term borrowings | 461,760 | 312,777 |
Long-term debt | 77,470 | 103,749 |
Subordinated debt | 76,995 | 75,310 |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 85,183 |  |
Interest-bearing deposits | 3,881 |  |
Securities available for sale | 440 |  |
Other investments | 0 |  |
Loans | 0 |  |
Deposits | 0 |  |
Short-term borrowings | 0 |  |
Long-term debt | 0 |  |
Subordinated debt | 0 |  |
Estimated Fair Value [Member] | Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 |  |
Interest-bearing deposits | 0 |  |
Securities available for sale | 1,105,911 |  |
Other investments | 32,479 |  |
Loans | 59,241 |  |
Deposits | 4,435,555 |  |
Short-term borrowings | 461,760 |  |
Long-term debt | 77,470 |  |
Subordinated debt | 0 |  |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 |  |
Interest-bearing deposits | 0 |  |
Securities available for sale | 24,471 |  |
Other investments | 0 |  |
Loans | 4,210,581 |  |
Deposits | 0 |  |
Short-term borrowings | 0 |  |
Long-term debt | 0 |  |
Subordinated debt | $ 76,995 |  |

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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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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