Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	$ 129,313	$ 118,994
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	129,313	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	213,963	206,144
Gross Amount Offset, Financial assets	0	0
Net Amount Recognized, Financial assets	213,963	206,144
Gross Amount Recognized, Derivatives, Financial Liabilities	55,909	73,829
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	55,909	73,829
Gross Amount Recognized, Repurchase agreements, Financial liabilities	3,722,245	4,660,641
Gross Amount Offset, Repurchase agreements, Financial liabilities	0	0
Net Amount Recognized, Repurchase agreements, Financial liabilities	3,722,245	4,660,641
Gross Amount Recognized, Financial liabilities	3,778,154	4,734,470
Gross Amount Offset, Financial liabilities	0	0
Net Amount Recognized, Financial Liabilities	3,778,154	4,734,470
Loan/lease interest rate swaps and caps [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	109,423	85,691
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	109,423	85,691
Gross Amount Recognized, Derivatives, Financial Liabilities	674	1,102
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	674	1,102
Commodity swaps and options [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Gross Amount Recognized, Derivatives, Financial Assets	19,890	33,302
Gross Amount Offset, Derivatives, Financial assets	0	0
Net Amount Recognized, Derivatives, Financial assets	19,890	33,302
Gross Amount Recognized, Derivatives, Financial Liabilities	55,235	72,717
Gross Amount Offset, Derivatives, Financial liabilities	0	0
Net Amount Recognized, Derivatives, Financial liabilities	$ 55,235	72,717
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		10
Gross Amount Offset, Derivatives, Financial liabilities		0
Net Amount Recognized, Derivatives, Financial liabilities		$ 10