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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | $ 105,051 | $ 125,436 |
Interest-bearing deposits | 28,358 | 21,557 |
Debt Securities, Available-for-Sale | 1,147,623 | 1,020,986 |
Debt Securities, Held-to-maturity | 405,639 | 419,009 |
Other investments | 30,954 | 50,871 |
Financing receivable, before allowance for credit loss | 8,983,754 | 8,968,761 |
Deposits | 9,678,019 | 9,192,309 |
Short-term borrowings | 80,139 | 597,835 | $ 372,694
Long-term debt | 130,353 | 4,122 |
Subordinated Debentures outstanding, Amount | 128,305 | 177,741 |
Capital lease obligation | 4,327 | 4,894 |
Loans Held for Sale | 51,991 | 29,820 |
Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Loans Held for Sale | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Debt Securities, Available-for-Sale | 1,147,623 | 1,020,986 |
Loans Held for Sale | 51,991 | 29,820 |
Level 3 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Loans Held for Sale | 0 | 0 |
Carrying Amount [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 105,051 | 125,436 |
Interest-bearing deposits | 28,358 | 21,557 |
Debt Securities, Available-for-Sale | 1,147,623 | 1,020,986 |
Debt Securities, Held-to-maturity | 405,639 | 419,009 |
Other investments | 30,954 | 50,871 |
Loans held for sale | 51,991 | 29,820 |
Financing receivable, before allowance for credit loss | 8,983,754 | 8,968,761 |
Deposits | 9,678,019 | 9,192,309 |
Short-term borrowings | 80,139 | 597,835 |
Long-term debt | 130,353 | 4,122 |
Subordinated Debentures outstanding, Amount | 128,305 | 177,741 |
Capital lease obligation | 4,327 | 4,894 |
Estimated Fair Value [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 105,051 | 125,436 |
Interest-bearing deposits | 28,358 | 21,557 |
Debt Securities, Available-for-Sale | 1,147,623 | 1,020,986 |
Debt Securities, Held-to-maturity | 336,719 | 350,595 |
Other investments | 30,954 | 50,871 |
Loans held for sale | 52,219 | 29,820 |
Financing receivable, before allowance for credit loss | 8,999,020 | 8,860,736 |
Deposits | 9,672,358 | 9,187,655 |
Short-term borrowings | 79,151 | 594,670 |
Long-term debt | 129,880 | 4,041 |
Subordinated Debentures outstanding, Amount | 115,747 | 151,525 |
Capital lease obligation | 4,327 | 4,894 |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |
Cash and due from banks | 105,051 | 125,436 |
Interest-bearing deposits | 28,358 | 21,557 |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 0 | 0 |
Loans held for sale | 0 | 0 |
Financing receivable, before allowance for credit loss | 0 | 0 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital lease obligation | 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 |
Debt Securities, Available-for-Sale | 1,147,623 | 1,020,986 |
Debt Securities, Held-to-maturity | 336,719 | 350,595 |
Other investments | 25,222 | 44,689 |
Loans held for sale | 52,219 | 29,820 |
Financing receivable, before allowance for credit loss | 39,407 | 25,215 |
Deposits | 9,672,358 | 9,187,655 |
Short-term borrowings | 79,151 | 594,670 |
Long-term debt | 129,880 | 4,041 |
Subordinated Debentures outstanding, Amount | 0 | 0 |
Capital lease obligation | 4,327 | 4,894 |
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 |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-maturity | 0 | 0 |
Other investments | 5,732 | 6,182 |
Loans held for sale | 0 | 0 |
Financing receivable, before allowance for credit loss | 8,959,613 | 8,835,521 |
Deposits | 0 | 0 |
Short-term borrowings | 0 | 0 |
Long-term debt | 0 | 0 |
Subordinated Debentures outstanding, Amount | 115,747 | 151,525 |
Capital lease obligation | $ 0 | $ 0 |

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