Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Carrying Amount [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	$ 113,692	$ 124,254
Interest-bearing deposits	282,110	29,990
Debt Securities, Available-for-Sale	750,613	762,661
Debt Securities, Held-to-maturity	451,278	461,162
Other investments	36,200	26,414
Loans Held for sale, Amount	11,050	11,869
Loans and Leases Receivable, Net of Deferred Income	8,656,945	7,642,143
Deposits	9,234,948	8,005,469
Short-term borrowings	278,978	372,694
Subordinated debt	177,558	170,937
Long-term debt	4,679	4,862
Capital Lease Obligations	5,294	5,425
Estimate of Fair Value Measurement [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	113,692	124,254
Interest-bearing deposits	282,110	29,990
Debt Securities, Available-for-Sale	750,613	762,661
Debt Securities, Held-to-maturity	381,741	386,205
Other investments	36,200	26,414
Loans Held for sale, Amount	11,050	11,869
Loans and Leases Receivable, Net of Deferred Income	8,514,685	7,639,721
Deposits	9,223,482	7,992,012
Short-term borrowings	272,601	363,135
Subordinated debt	156,402	156,621
Long-term debt	4,651	4,781
Capital Lease Obligations	5,294	5,425
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	113,692	124,254
Interest-bearing deposits	282,110	29,990
Debt Securities, Available-for-Sale	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
Debt Securities, Available-for-Sale	750,613	762,661
Debt Securities, Held-to-maturity	381,741	386,205
Other investments	30,030	25,244
Loans Held for sale, Amount	11,050	11,869
Loans and Leases Receivable, Net of Deferred Income	25,806	23,140
Deposits	9,223,482	7,992,012
Short-term borrowings	272,601	363,135
Subordinated debt	0	0
Long-term debt	4,651	4,781
Capital Lease Obligations	5,294	5,425
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
Debt Securities, Available-for-Sale	0	0
Debt Securities, Held-to-maturity	0	0
Other investments	6,170	1,170
Loans Held for sale, Amount	0	0
Loans and Leases Receivable, Net of Deferred Income	8,488,879	7,616,581
Deposits	0	0
Short-term borrowings	0	0
Subordinated debt	156,402	156,621
Long-term debt	0	0
Capital Lease Obligations	0	0
Cash and due from banks	113,692	124,254
Interest-bearing deposits	282,110	29,990
Debt Securities, Available-for-Sale	750,613	762,661
Debt Securities, Held-to-maturity	451,278	461,162
Other investments	36,200	26,414
Loans and Leases Receivable, Net of Deferred Income	8,656,945	7,642,143
Deposits	9,234,948	8,005,469
Short-term borrowings	278,978	372,694
Subordinated debt	177,558	170,937
Long-term debt	4,679	4,862
Capital Lease Obligations	5,294	5,425
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	30,030	25,244
Level 3 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Other investments	$ 6,170	$ 1,170