Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	$ 119,723	$ 118,994
Gross Amount Offset, Derivatives, Financial Assets	0	0
Net Amount Recognized, Derivative, Financial Assets	119,723	118,994
Gross Amount Recognized, Resell Agreements, Financial Assets	84,650	87,150
Gross Amount Offset, Resell Agreements, Financial Assets	0	0
Net Amount Recognized, Resell Agreements, Financial Assets	84,650	87,150
Gross Amount Recognized, Financial Assets	204,373	206,144
Gross Amount Offset, Financial Assets	0	0
Net Amount Recognized, Financial Assets	204,373	206,144
Gross Amount Recognized, Derivative, Financial Liabilities	41,311	73,829
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Net Amount Recognized, Derivative, Financial Liabilities	41,311	73,829
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities	4,127,188	4,660,641
Gross Amount Offset, Repurchase Agreements, Financial Liabilities	0	0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities	4,127,188	4,660,641
Gross Amount Recognized, Financial Liabilities	4,168,499	4,734,470
Gross Amount Offset, Financial Liabilities	0	0
Net Amount Recognized, Financial Liabilities	4,168,499	4,734,470
Loan Lease Interest Rate Swaps And Caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	70,233	85,691
Gross Amount Offset, Derivatives, Financial Assets	0	0
Net Amount Recognized, Derivative, Financial Assets	70,233	85,691
Commodity Swaps And Options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	49,489	33,302
Gross Amount Offset, Derivatives, Financial Assets	0	0
Net Amount Recognized, Derivative, Financial Assets	49,489	33,302
Gross Amount Recognized, Derivative, Financial Liabilities	20,999	72,717
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Net Amount Recognized, Derivative, Financial Liabilities	20,999	72,717
Foreign Currency Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Assets	1	1
Gross Amount Offset, Derivatives, Financial Assets	0	0
Net Amount Recognized, Derivative, Financial Assets	1	1
Gross Amount Recognized, Derivative, Financial Liabilities	19	10
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Net Amount Recognized, Derivative, Financial Liabilities	19	10
Loan Lease Interest Rate Swaps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivative, Financial Liabilities	20,293	1,102
Gross Amount Offset, Derivative, Financial Liabilities	0	0
Net Amount Recognized, Derivative, Financial Liabilities	$ 20,293	$ 1,102