Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Ending Balance	$ 147,966	$ 80,139	$ 597,835
Average Balance	$ 95,322	$ 444,453	$ 439,556
Average Rate	3.67%	4.60%	4.95%
Federal funds purchased
Short-term Debt [Line Items]
Ending Balance	$ 0	$ 0	$ 0
Average Balance	$ 0	$ 35	$ 712
Average Rate	0.00%	5.71%	5.62%
Borrowings from FHLB
Short-term Debt [Line Items]
Ending Balance	$ 125,000	$ 55,000	$ 563,000
Average Balance	$ 64,647	$ 31,869	$ 379,712
Average Rate	4.71%	5.58%	5.56%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Ending Balance	$ 22,966	$ 25,139	$ 34,835
Average Balance	$ 30,675	$ 29,418	$ 59,132
Average Rate	1.47%	1.25%	1.01%
Federal Reserve Bank Term Funding Program
Short-term Debt [Line Items]
Ending Balance	$ 0	$ 0	$ 0
Average Balance	$ 0	$ 383,131	$ 0
Average Rate	0.00%	4.77%	0.00%
Maximum [Member]
Short-term Debt [Line Items]
Ending Balance	$ 225,874	$ 653,110	$ 597,835
Weighted Average [Member]
Short-term Debt [Line Items]
Average Rate	3.57%	3.71%	5.37%