Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 130,675	$ 117,790
Allowance for credit losses - loan commitments, beginning balance	8,604	8,368
Total beginning allowance for credit losses - loans and loan commitments	139,279	126,158
Provision for loan losses	4,450	2,827
Provision for loan commitments	(429)	759
Total provision for credit losses - loans and loan commitments	4,021	3,586
Charge-offs	(7,583)	(3,319)
Recoveries	1,648	1,400
Net (charge-offs) recoveries	(5,935)	(1,919)
Allowance for credit losses - loans, ending balance	129,190	118,698
Allowance for credit losses - loan commitments, ending balance	8,175	9,127
Total ending allowance for credit losses - loans and loan commitments	137,365	127,825
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	36,644	31,540
Allowance for credit losses - loan commitments, beginning balance	429
Total beginning allowance for credit losses - loans and loan commitments	37,073	31,540
Provision for loan losses	5,806	(2,783)
Provision for loan commitments	124	797
Total provision for credit losses - loans and loan commitments	5,930	(1,986)
Charge-offs	(4,810)	(320)
Recoveries	401	134
Net (charge-offs) recoveries	(4,409)	(186)
Allowance for credit losses - loans, ending balance	38,041	28,571
Allowance for credit losses - loan commitments, ending balance	553	797
Total ending allowance for credit losses - loans and loan commitments	38,594	29,368
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,366	1,285
Total beginning allowance for credit losses - loans and loan commitments	1,366	1,285
Provision for loan losses	194	(103)
Total provision for credit losses - loans and loan commitments	194	(103)
Charge-offs	(453)	(401)
Recoveries	128	140
Net (charge-offs) recoveries	(325)	(261)
Allowance for credit losses - loans, ending balance	1,235	921
Total ending allowance for credit losses - loans and loan commitments	1,235	921
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	7,123	6,737
Allowance for credit losses - loan commitments, beginning balance	6,894	6,025
Total beginning allowance for credit losses - loans and loan commitments	14,017	12,762
Provision for loan losses	858	(1,440)
Provision for loan commitments	(568)	(51)
Total provision for credit losses - loans and loan commitments	290	(1,491)
Charge-offs	(813)	(222)
Recoveries		73
Net (charge-offs) recoveries	(813)	(149)
Allowance for credit losses - loans, ending balance	7,168	5,148
Allowance for credit losses - loan commitments, ending balance	6,326	5,974
Total ending allowance for credit losses - loans and loan commitments	13,494	11,122
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	59,351	52,659
Total beginning allowance for credit losses - loans and loan commitments	59,351	52,659
Provision for loan losses	(3,621)	2,508
Total provision for credit losses - loans and loan commitments	(3,621)	2,508
Charge-offs	(58)	(1,355)
Recoveries	432	276
Net (charge-offs) recoveries	374	(1,079)
Allowance for credit losses - loans, ending balance	56,104	54,088
Total ending allowance for credit losses - loans and loan commitments	56,104	54,088
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	21,218	18,208
Allowance for credit losses - loan commitments, beginning balance	1,276	2,215
Total beginning allowance for credit losses - loans and loan commitments	22,494	20,423
Provision for loan losses	650	4,407
Provision for loan commitments	9	(10)
Total provision for credit losses - loans and loan commitments	659	4,397
Charge-offs	(135)	13
Recoveries	34	75
Net (charge-offs) recoveries	(101)	88
Allowance for credit losses - loans, ending balance	21,767	22,703
Allowance for credit losses - loan commitments, ending balance	1,285	2,205
Total ending allowance for credit losses - loans and loan commitments	23,052	24,908
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	3,956	3,127
Total beginning allowance for credit losses - loans and loan commitments	3,956	3,127
Provision for loan losses	538	97
Total provision for credit losses - loans and loan commitments	538	97
Charge-offs	(1,098)	(776)
Recoveries	455	622
Net (charge-offs) recoveries	(643)	(154)
Allowance for credit losses - loans, ending balance	3,851	3,070
Total ending allowance for credit losses - loans and loan commitments	3,851	3,070
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,017	4,234
Allowance for credit losses - loan commitments, beginning balance	5	128
Total beginning allowance for credit losses - loans and loan commitments	1,022	4,362
Provision for loan losses	25	141
Provision for loan commitments	6	23
Total provision for credit losses - loans and loan commitments	31	164
Charge-offs	(216)	(258)
Recoveries	198	80
Net (charge-offs) recoveries	(18)	(178)
Allowance for credit losses - loans, ending balance	1,024	4,197
Allowance for credit losses - loan commitments, ending balance	11	151
Total ending allowance for credit losses - loans and loan commitments	$ 1,035	$ 4,348