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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 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 77,485 | $ 98,724 |
Interest-bearing deposits | 4,497 | 4,258 |
Securities available for sale | 1,306,687 | 1,171,303 |
Other investments | 33,913 | 28,228 |
Loans | 4,229,752 | 4,204,704 | 4,159,531
Deposits | 4,733,047 | 4,557,881 |
Short-term borrowings | 441,848 | 356,227 |
Long-term debt | 144,615 | 174,471 |
Subordinated debt | 72,167 | 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 | 33,913 | 28,228 |
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 | 77,485 | 98,724 |
Interest-bearing deposits | 4,497 | 4,258 |
Securities available for sale | 1,306,687 | 1,171,303 |
Other investments | 33,913 | 28,228 |
Loans | 4,229,752 | 4,204,704 |
Deposits | 4,733,047 | 4,557,881 |
Short-term borrowings | 441,848 | 356,227 |
Long-term debt | 144,615 | 174,471 |
Subordinated debt | 72,167 | 105,750 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 77,485 | 98,724 |
Interest-bearing deposits | 4,497 | 4,258 |
Securities available for sale | 1,306,687 | 1,171,303 |
Other investments | 33,913 | 28,228 |
Loans | 4,276,416 | 4,245,114 |
Deposits | 4,664,831 | 4,493,764 |
Short-term borrowings | 441,838 | 356,221 |
Long-term debt | 145,721 | 176,178 |
Subordinated debt | 47,833 | 76,735 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 77,485 | 98,724 |
Interest-bearing deposits | 4,497 | 4,258 |
Securities available for sale | 688 | 555 |
Other investments | 0 | 0 |
Loans | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated debt | 0 | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 | 0 |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 1,278,710 | 1,145,955 |
Other investments | 33,913 | 28,228 |
Loans | 55,903 | 82,949 |
Deposits | 4,664,831 | 4,493,764 |
Short-term borrowings | 441,838 | 356,221 |
Long-term debt | 145,721 | 176,178 |
Subordinated debt | 0 | 0 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 0 | 0 |
Interest-bearing deposits | 0 | 0 |
Securities available for sale | 27,289 | 24,793 |
Other investments | 0 | 0 |
Loans | 4,220,513 | 4,162,165 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated debt | $ 47,833 | $ 76,735 |

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