Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	$ 65,595	$ 88,337
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	65,595	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	65,595	97,987
Gross Amount Offset, Financial assets	0	0
Net Amount Recognized, Financial assets	65,595	97,987
Gross Amount Recognized, Derivatives, Financial Liabilities	50,498	22,504
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	50,498	22,504
Gross Amount Recognized, Repurchase agreements, Financial liabilities	4,886,598	4,525,855
Gross Amount Offset, Repurchase agreements, Financial liabilities	0	0
Net Amount Recognized, Repurchase agreements, Financial liabilities	4,886,598	4,525,855
Gross Amount Recognized, Financial liabilities	4,937,096	4,548,359
Gross Amount Offset, Financial liabilities	0	0
Net Amount Recognized, Financial Liabilities	4,937,096	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	47,718	38,065
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	47,718	38,065
Gross Amount Recognized, Derivatives, Financial Liabilities	7,539	20,598
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	7,539	20,598
Commodity swaps and options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	17,877	50,272
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	17,877	50,272
Gross Amount Recognized, Derivatives, Financial Liabilities	42,959	1,906
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	$ 42,959	$ 1,906