Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Carrying Amount [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	$ 123,095	$ 124,254
Interest-bearing deposits	325,774	29,990
Debt Securities, Available-for-Sale	738,109	762,661
Debt Securities, Held-to-maturity	439,922	461,162
Other investments	46,394	26,414
Loans Held for sale, Amount	16,300	11,869
Loans and Leases Receivable, Net of Deferred Income	8,799,836	7,642,143
Deposits	9,146,278	8,005,469
Short-term borrowings	542,839	372,694
Subordinated debt	177,619	170,937
Long-term debt	4,495	4,862
Capital Lease Obligations	5,162	5,425
Estimate of Fair Value Measurement [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	123,095	124,254
Interest-bearing deposits	325,774	29,990
Debt Securities, Available-for-Sale	738,109	762,661
Debt Securities, Held-to-maturity	364,615	386,205
Other investments	46,394	26,414
Loans Held for sale, Amount	16,300	11,869
Loans and Leases Receivable, Net of Deferred Income	8,566,743	7,639,721
Deposits	9,130,436	7,992,012
Short-term borrowings	535,875	363,135
Subordinated debt	149,932	156,621
Long-term debt	4,388	4,781
Capital Lease Obligations	5,162	5,425
Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Cash and due from banks	123,095	124,254
Interest-bearing deposits	325,774	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	738,109	762,661
Debt Securities, Held-to-maturity	364,615	386,205
Other investments	40,212	25,244
Loans Held for sale, Amount	16,300	11,869
Loans and Leases Receivable, Net of Deferred Income	26,771	23,140
Deposits	9,130,436	7,992,012
Short-term borrowings	535,875	363,135
Subordinated debt	0	0
Long-term debt	4,388	4,781
Capital Lease Obligations	5,162	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	6,182	1,170
Loans Held for sale, Amount	0	0
Loans and Leases Receivable, Net of Deferred Income	8,539,972	7,616,581
Deposits	0	0
Short-term borrowings	0	0
Subordinated debt	149,932	156,621
Long-term debt	0	0
Capital Lease Obligations	0	0
Cash and due from banks	123,095	124,254
Interest-bearing deposits	325,774	29,990
Debt Securities, Available-for-Sale	738,109	762,661
Debt Securities, Held-to-maturity	439,922	461,162
Other investments	46,394	26,414
Loans and Leases Receivable, Net of Deferred Income	8,799,836	7,642,143
Deposits	9,146,278	8,005,469
Short-term borrowings	542,839	372,694
Subordinated debt	177,619	170,937
Long-term debt	4,495	4,862
Capital Lease Obligations	5,162	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	40,212	25,244
Level 3 [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Other investments	$ 6,182	$ 1,170