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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 95,934 | $ 98,624 |
Interest-bearing deposits | 3,013 | 8,668 |
Securities available for sale | 909,247 | 731,358 |
Debt Securities, Held-to-maturity | 393,855 | 422,096 |
Other investments | 32,126 | 29,837 |
Loans | 5,774,139 | 5,407,376 | $ 4,879,347
Deposits | 5,897,992 | 5,580,705 |
Short-term borrowings | 721,823 | 707,466 | $ 867,943
Long-term debt | 7,551 | 8,161 |
Subordinated Debentures outstanding, Amount | 170,288 | 72,167 |
Capital Lease Obligations, Current | 7,217 | 7,590 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 0 | 0 |
Other investments | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 909,247 | 706,042 |
Other investments | 30,456 |  |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale | 0 | 25,316 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 95,934 | 98,624 |
Interest-bearing deposits | 3,013 | 8,668 |
Securities available for sale | 909,247 | 731,358 |
Debt Securities, Held-to-maturity | 393,855 | 422,096 |
Other investments | 32,126 | 29,837 |
Loans held for sale | 11,881 | 14,850 |
Loans | 5,774,139 | 5,407,376 |
Deposits | 5,897,992 | 5,580,705 |
Short-term borrowings | 721,823 | 707,466 |
Long-term debt | 7,551 | 8,161 |
Subordinated Debentures outstanding, Amount | 170,288 | 72,167 |
Capital Lease Obligations, Current | 7,217 | 7,590 |
Estimated Fair Value [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 95,934 | 98,624 |
Interest-bearing deposits | 3,013 | 8,668 |
Securities available for sale | 909,247 | 731,358 |
Debt Securities, Held-to-maturity | 383,993 | 418,249 |
Other investments | 32,126 | 29,837 |
Loans held for sale | 11,881 | 14,850 |
Loans | 5,821,791 | 5,443,434 |
Deposits | 5,904,147 | 5,580,812 |
Short-term borrowings | 721,532 | 707,263 |
Long-term debt | 7,720 | 8,548 |
Subordinated Debentures outstanding, Amount | 168,067 | 65,785 |
Capital Lease Obligations, Current | 7,217 | 7,590 |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 95,934 | 98,624 |
Interest-bearing deposits | 3,013 | 8,668 |
Securities available for sale | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital Lease Obligations, Current | 0 | 0 |
Estimated Fair Value [Member] | Fair Value, Inputs, 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 | 909,247 | 706,042 |
Debt Securities, Held-to-maturity | 383,993 | 418,249 |
Other investments | 30,456 | 29,837 |
Loans held for sale | 11,881 | 14,850 |
Loans | 15,076 | 23,249 |
Deposits | 5,904,147 | 5,580,812 |
Short-term borrowings | 721,532 | 707,263 |
Long-term debt | 7,720 | 8,548 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital Lease Obligations, Current | 7,217 | 7,590 |
Estimated Fair Value [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 | 0 | 25,316 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 1,670 | 0 |
Loans held for sale | 0 | 0 |
Loans | 5,806,715 | 5,420,185 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 168,067 | 65,785 |
Capital Lease Obligations, Current | $ 0 | $ 0 |

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