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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 100,724 | $ 95,934 |
Interest-bearing deposits | 23,168 | 3,013 |
Securities available for sale, at fair value | 893,101 | 909,247 |
Debt Securities, Held-to-maturity | 384,909 | 393,855 |
Other investments | 25,378 | 32,126 |
Loans and Leases Receivable, Net of Deferred Income | 5,871,070 | 5,774,139 | $ 5,381,305
Deposits | 6,130,760 | 5,897,992 |
Short-term borrowings | 565,616 | 721,823 |
Subordinated debt | 170,328 | 170,288 |
Long-term debt | 7,395 | 7,551 |
Capital Lease Obligations | 7,118 | 7,217 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 0 | 0 |
Other investments | 0 | 0 |
Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 893,101 | 909,247 |
Other investments | 23,708 | 30,456 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Securities available for sale, at fair value | 0 | 0 |
Other investments | 1,670 | 1,670 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,724 | 95,934 |
Interest-bearing deposits | 23,168 | 3,013 |
Securities available for sale, at fair value | 893,101 | 909,247 |
Debt Securities, Held-to-maturity | 384,909 | 393,855 |
Other investments | 25,378 | 32,126 |
Loans Held for sale, Amount | 9,627 | 11,881 |
Loans and Leases Receivable, Net of Deferred Income | 5,871,070 | 5,774,139 |
Deposits | 6,130,760 | 5,897,992 |
Short-term borrowings | 565,616 | 721,823 |
Subordinated debt | 170,328 | 170,288 |
Long-term debt | 7,395 | 7,551 |
Capital Lease Obligations | 7,118 | 7,217 |
Estimate of Fair Value Measurement [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,724 | 95,934 |
Interest-bearing deposits | 23,168 | 3,013 |
Securities available for sale, at fair value | 893,101 | 909,247 |
Debt Securities, Held-to-maturity | 380,443 | 383,993 |
Other investments | 25,378 | 32,126 |
Loans Held for sale, Amount | 9,627 | 11,881 |
Loans and Leases Receivable, Net of Deferred Income | 5,921,319 | 5,821,791 |
Deposits | 6,135,980 | 5,904,147 |
Short-term borrowings | 565,522 | 721,532 |
Subordinated debt | 169,764 | 168,067 |
Long-term debt | 7,701 | 7,720 |
Capital Lease Obligations | 7,118 | 7,217 |
Estimate of Fair Value Measurement [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 100,724 | 95,934 |
Interest-bearing deposits | 23,168 | 3,013 |
Securities available for sale, at fair value | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 0 | 0 |
Loans Held for sale, Amount | 0 | 0 |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Subordinated debt | 0 | 0 |
Long-term debt | 0 | 0 |
Capital Lease Obligations | 0 | 0 |
Estimate of Fair Value Measurement [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, at fair value | 893,101 | 909,247 |
Debt Securities, Held-to-maturity | 380,443 | 383,993 |
Other investments | 23,708 | 30,456 |
Loans Held for sale, Amount | 9,627 | 11,881 |
Loans and Leases Receivable, Net of Deferred Income | 14,391 | 15,076 |
Deposits | 6,135,980 | 5,904,147 |
Short-term borrowings | 565,522 | 721,532 |
Subordinated debt | 0 | 0 |
Long-term debt | 7,701 | 7,720 |
Capital Lease Obligations | 7,118 | 7,217 |
Estimate of Fair Value Measurement [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, at fair value | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 1,670 | 1,670 |
Loans Held for sale, Amount | 0 | 0 |
Loans and Leases Receivable, Net of Deferred Income | 5,906,928 | 5,806,715 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Subordinated debt | 169,764 | 168,067 |
Long-term debt | 0 | 0 |
Capital Lease Obligations | $ 0 | $ 0 |

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