Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 117,790	$ 121,622
Allowance for credit losses - loan commitments, beginning balance	8,368	7,775
Total beginning allowance for credit losses - loans and loan commitments	126,158	129,397
Provision for loan losses	4,876	(4,190)
Provision for loan commitments	1,756	(57)
Total provision for credit losses - loans and loan commitments	6,632	(4,247)
Charge-offs	(5,329)	(3,452)
Recoveries	2,829	3,423
Net (charge-offs) recoveries	(2,500)	(29)
Allowance for credit losses - loans, ending balance	120,166	117,403
Allowance for credit losses - loan commitments, ending balance	10,124	7,718
Total ending allowance for credit losses - loans and loan commitments	130,290	125,121
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	31,540	26,875
Allowance for credit losses - loan commitments, beginning balance		1,497
Total beginning allowance for credit losses - loans and loan commitments	31,540	28,372
Provision for loan losses	1,337	1,097
Provision for loan commitments	527	(1,288)
Total provision for credit losses - loans and loan commitments	1,864	(191)
Charge-offs	(999)	(355)
Recoveries	259	551
Net (charge-offs) recoveries	(740)	196
Allowance for credit losses - loans, ending balance	32,137	28,168
Allowance for credit losses - loan commitments, ending balance	527	209
Total ending allowance for credit losses - loans and loan commitments	32,664	28,377
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,285	2,220
Total beginning allowance for credit losses - loans and loan commitments	1,285	2,220
Provision for loan losses	407	(58)
Total provision for credit losses - loans and loan commitments	407	(58)
Charge-offs	(818)	(776)
Recoveries	221	173
Net (charge-offs) recoveries	(597)	(603)
Allowance for credit losses - loans, ending balance	1,095	1,559
Total ending allowance for credit losses - loans and loan commitments	1,095	1,559
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	6,737	7,310
Allowance for credit losses - loan commitments, beginning balance	6,025	4,180
Total beginning allowance for credit losses - loans and loan commitments	12,762	11,490
Provision for loan losses	(845)	845
Provision for loan commitments	1,168	696
Total provision for credit losses - loans and loan commitments	323	1,541
Charge-offs	(222)	(73)
Recoveries	128	25
Net (charge-offs) recoveries	(94)	(48)
Allowance for credit losses - loans, ending balance	5,798	8,107
Allowance for credit losses - loan commitments, ending balance	7,193	4,876
Total ending allowance for credit losses - loans and loan commitments	12,991	12,983
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	52,659	65,355
Allowance for credit losses - loan commitments, beginning balance		201
Total beginning allowance for credit losses - loans and loan commitments	52,659	65,556
Provision for loan losses	1,246	(6,401)
Provision for loan commitments	182	(201)
Total provision for credit losses - loans and loan commitments	1,428	(6,602)
Charge-offs	(1,381)	(137)
Recoveries	427	740
Net (charge-offs) recoveries	(954)	603
Allowance for credit losses - loans, ending balance	52,951	59,557
Allowance for credit losses - loan commitments, ending balance	182
Total ending allowance for credit losses - loans and loan commitments	53,133	59,557
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	18,208	15,401
Allowance for credit losses - loan commitments, beginning balance	2,215	1,576
Total beginning allowance for credit losses - loans and loan commitments	20,423	16,977
Provision for loan losses	1,787	(491)
Provision for loan commitments	(621)	582
Total provision for credit losses - loans and loan commitments	1,166	91
Charge-offs	7	(243)
Recoveries	313	264
Net (charge-offs) recoveries	320	21
Allowance for credit losses - loans, ending balance	20,315	14,931
Allowance for credit losses - loan commitments, ending balance	1,594	2,158
Total ending allowance for credit losses - loans and loan commitments	21,909	17,089
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	3,127	3,737
Allowance for credit losses - loan commitments, beginning balance		272
Total beginning allowance for credit losses - loans and loan commitments	3,127	4,009
Provision for loan losses	693	780
Provision for loan commitments		140
Total provision for credit losses - loans and loan commitments	693	920
Charge-offs	(1,601)	(1,690)
Recoveries	1,231	1,477
Net (charge-offs) recoveries	(370)	(213)
Allowance for credit losses - loans, ending balance	3,450	4,304
Allowance for credit losses - loan commitments, ending balance		412
Total ending allowance for credit losses - loans and loan commitments	3,450	4,716
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	4,234	724
Allowance for credit losses - loan commitments, beginning balance	128	49
Total beginning allowance for credit losses - loans and loan commitments	4,362	773
Provision for loan losses	251	38
Provision for loan commitments	500	14
Total provision for credit losses - loans and loan commitments	751	52
Charge-offs	(315)	(178)
Recoveries	250	193
Net (charge-offs) recoveries	(65)	15
Allowance for credit losses - loans, ending balance	4,420	777
Allowance for credit losses - loan commitments, ending balance	628	63
Total ending allowance for credit losses - loans and loan commitments	$ 5,048	$ 840