Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	$ 97,431	$ 88,337
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	97,431	88,337
Gross Amount Recognized, Resell agreements, Financial assets	0	9,650
Gross Amount Offset, Resell agreements, Financial assets	0	0
Net Amount Recognized, Resell agreements, Financial assets	0	9,650
Gross Amount Recognized, Financial assets	97,431	97,987
Gross Amount Offset, Financial assets	0	0
Net Amount Recognized, Financial assets	97,431	97,987
Gross Amount Recognized, Derivatives, Financial Liabilities	148,885	22,504
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	148,885	22,504
Gross Amount Recognized, Repurchase agreements, Financial liabilities	5,116,888	4,525,855
Gross Amount Offset, Repurchase agreements, Financial liabilities	0	0
Net Amount Recognized, Repurchase agreements, Financial liabilities	5,116,888	4,525,855
Gross Amount Recognized, Financial liabilities	5,265,773	4,548,359
Gross Amount Offset, Financial liabilities	0	0
Net Amount Recognized, Financial Liabilities	5,265,773	4,548,359
Loan/lease interest rate swaps and caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	85,210	38,065
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	85,210	38,065
Gross Amount Recognized, Derivatives, Financial Liabilities	782	20,598
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	782	20,598
Commodity swaps and options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	12,220	50,272
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	12,220	50,272
Gross Amount Recognized, Derivatives, Financial Liabilities	148,103	1,906
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	148,103	$ 1,906
Foreign currency forward contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	1
Gross Amount Offset, Derivatives, Financial assets	0
Net Amount Recognized, Derivatives, Financial assets	$ 1