Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	$ 88,337	$ 101,329
Gross Amount Offset, Derivatives, Financial Assets	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	88,337	101,329
Gross Amount Recognized, Resell Agreements, Financial Assets	9,650	9,650
Gross Amount Offset, Resell Agreements, Financial Assets	0	0
Net Amount Recognized, Resell Agreements, Financial Assets	9,650	9,650
Gross Amount Recognized, Financial Assets	97,987	110,979
Gross Amount Offset, Financial Assets	0	0
Net Amount Recognized, Financial Assets	97,987	110,979
Gross Amount Recognized, Derivative, Financial Liabilities	22,504	26,019
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	22,504	26,019
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities	4,525,855	4,342,941
Gross Amount Offset, Repurchase Agreements, Financial Liabilities	0	0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities	4,525,855	4,342,941
Gross Amount Recognized, Financial Liabilities	4,548,359	4,368,960
Gross Amount Offset, Financial Liabilities	0	0
Net Amount Recognized, Financial Liabilities	4,548,359	4,368,960
Loan Lease Interest Rate Swaps And Caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	38,065	70,054
Gross Amount Offset, Derivatives, Financial Assets	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	38,065	70,054
Commodity Swaps And Options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	50,272	31,275
Gross Amount Offset, Derivatives, Financial Assets	0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	50,272	31,275
Gross Amount Recognized, Derivative, Financial Liabilities	1,906	16,951
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	1,906	16,951
Loan Lease Interest Rate Swaps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Liabilities	20,598	9,068
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 20,598	$ 9,068