Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	$ 96,708	$ 119,723
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	96,708	119,723
Gross Amount Recognized, Resell agreements, Financial assets	9,650	84,650
Gross Amount Offset, Resell agreements, Financial assets	0	0
Net Amount Recognized, Resell agreements, Financial assets	9,650	84,650
Gross Amount Recognized, Financial assets	106,358	204,373
Gross Amount Offset, Financial assets	0	0
Net Amount Recognized, Financial assets	106,358	204,373
Gross Amount Recognized, Derivatives, Financial Liabilities	44,056	41,311
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	44,056	41,311
Gross Amount Recognized, Repurchase agreements, Financial liabilities	4,014,037	4,127,188
Gross Amount Offset, Repurchase agreements, Financial liabilities	0	0
Net Amount Recognized, Repurchase agreements, Financial liabilities	4,014,037	4,127,188
Gross Amount Recognized, Financial liabilities	4,058,093	4,168,499
Gross Amount Offset, Financial liabilities	0	0
Net Amount Recognized, Financial Liabilities	4,058,093	4,168,499
Loan/lease interest rate swaps and caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	46,705	70,233
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	46,705	70,233
Gross Amount Recognized, Derivatives, Financial Liabilities	30,034	20,293
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	30,034	20,293
Commodity swaps and options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	50,003	49,489
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	50,003	49,489
Gross Amount Recognized, Derivatives, Financial Liabilities	14,022	20,999
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	$ 14,022	20,999
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
Gross Amount Recognized, Derivatives, Financial Liabilities		19
Gross Amount Offset, Derivatives, Financial liabilities		0
Net Amount Recognized, Derivatives, Financial liabilities		$ 19