Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	$ 125,436	$ 124,254
Interest-bearing deposits	21,557	29,990
Debt Securities, Available-for-Sale	1,020,986	762,661
Debt Securities, Held-to-maturity	419,009	461,162
Other investments	50,871	26,414
Loans	8,968,761	7,642,143
Deposits	9,192,309	8,005,469
Short-term borrowings	597,835	372,694	$ 138,315
Long-term debt	4,122	4,862
Subordinated Debentures outstanding, Amount	177,741	170,937
Capital lease obligation	4,894	5,425
Loans Held for Sale	29,820	11,869
Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Debt Securities, Available-for-Sale	0	0
Other investments	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	1,020,986	762,661
Other investments	44,689	25,244
Loans Held for Sale	29,820	11,869
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	125,436	124,254
Interest-bearing deposits	21,557	29,990
Debt Securities, Available-for-Sale	1,020,986	762,661
Debt Securities, Held-to-maturity	419,009	461,162
Other investments	50,871	26,414
Loans held for sale	29,820	11,869
Loans	8,968,761	7,642,143
Deposits	9,192,309	8,005,469
Short-term borrowings	597,835	372,694
Long-term debt	4,122	4,862
Subordinated Debentures outstanding, Amount	177,741	170,937
Capital lease obligation	4,894	5,425
Estimated Fair Value [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	125,436	124,254
Interest-bearing deposits	21,557	29,990
Debt Securities, Available-for-Sale	1,020,986	762,661
Debt Securities, Held-to-maturity	350,595	386,205
Other investments	50,871	26,414
Loans held for sale	29,820	11,869
Loans	8,860,736	7,639,721
Deposits	9,187,655	7,992,012
Short-term borrowings	594,670	363,135
Long-term debt	4,041	4,781
Subordinated Debentures outstanding, Amount	151,525	156,621
Capital lease obligation	4,894	5,425
Estimated Fair Value [Member] | Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	125,436	124,254
Interest-bearing deposits	21,557	29,990
Debt 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 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	1,020,986	762,661
Debt Securities, Held-to-maturity	350,595	386,205
Other investments	44,689	25,244
Loans held for sale	29,820	11,869
Loans	25,215	23,140
Deposits	9,187,655	7,992,012
Short-term borrowings	594,670	363,135
Long-term debt	4,041	4,781
Subordinated Debentures outstanding, Amount	0	0
Capital lease obligation	4,894	5,425
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	6,182	1,170
Loans held for sale	0	0
Loans	8,835,521	7,616,581
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Subordinated Debentures outstanding, Amount	151,525	156,621
Capital lease obligation	$ 0	$ 0