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Loans and ACL - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 65	$ 89
Accrued interest excluded from ACL	12,900		$ 13,200
Loans pledged	2,393,364		2,430,117
Recorded investment of PCD Loans	51,000		51,000
Recorded investment, estimated allowance for credit loss	522		529
Recorded investment, PCD Discount (Premium)	3,700		3,800
Mortgage loans with amortized cost	1,300
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Commercial and industrial loan amount	32,300
Attributable to specific reserve	29,800
Collective specific reserve	9,600
Loans pledged	32,307		37,137
Commercial and Residential Mortgages [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	815,200		767,100
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	489,972		508,944
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | Federal Reserve Bank Borrowings [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	101,800		161,000
Commercial and Industrial [Member] | Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	$ 32,307		$ 37,136

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