Derivatives - Summary Information Regarding Derivatives (Detail) - Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Third Party interest rate swaps
Classified in Other Assets:
Notional Amount	$ 1,002,032	$ 946,843
Average Maturity (Years)	6 years 4 months 24 days	6 years 7 months 6 days
Weighted Average Fixed Rate	3.90%	3.79%
Weighted Average Variable Rate	198.00%	198.00%
Fair Value	$ 95,366	$ 81,309
Classified in Other Liabilities:
Notional Amount	$ 247,694	$ 266,607
Average Maturity (Years)	4 years 6 months	5 years 2 months 12 days
Weighted Average Fixed Rate	6.46%	6.26%
Weighted Average Variable Rate	214.00%	207.00%
Fair  Value	$ (2,371)	$ (6,257)
Customer interest rate swaps
Classified in Other Assets:
Notional Amount	$ 247,694	$ 266,607
Average Maturity (Years)	4 years 6 months	5 years 2 months 12 days
Weighted Average Fixed Rate	6.46%	6.26%
Weighted Average Variable Rate	214.00%	207.00%
Fair Value	$ 2,371	$ 6,257
Classified in Other Liabilities:
Notional Amount	$ 1,002,032	$ 946,843
Average Maturity (Years)	6 years 4 months 24 days	6 years 7 months 6 days
Weighted Average Fixed Rate	3.90%	3.79%
Weighted Average Variable Rate	198.00%	198.00%
Fair  Value	$ (95,370)	$ (81,313)