Derivative Financial Instruments (Schedule fair value of derivative instruments) (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	$ 8,539,724,000	$ 5,554,015,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	222,906,000	159,117,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Asset Derivatives, Fair Value, Less: Cash collateral posted	184,095,000	19,272,000
Derivative asset	22,682,000	133,481,000
Liability Derivatives, Notional Amount	9,379,322,000	4,747,534,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	414,499,000	21,784,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Liability Derivatives, Fair Value, Less: Cash collateral posted	$ 0	$ 2,119,000
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true	true
Derivative liability	$ 398,370,000	$ 13,301,000
CME SWAPS MARKETS (CME) [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value, Less: Cash collateral posted	59,200,000
Cross Currency Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	125,600,000	66,000,000
Liability Derivatives, Notional Amount	559,200,000	338,200,000
CME
Derivatives, Fair Value [Line Items]
Derivative asset	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	217,246,000	25,636,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Derivative asset	184,095,000	19,272,000
Derivative Liability, Fair Value, Gross Liability	16,129,000	8,483,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	16,129,000	6,364,000
Derivative liability	0	2,119,000
Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	1,350,000,000	1,000,000,000
Derivative Asset, Fair Value, Gross Asset	1,515,000	17,583,000
Liability Derivatives, Notional Amount	1,750,000,000	0
Derivative Liability, Fair Value, Gross Liability	9,632,000	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,189,724,000	4,554,015,000
Asset Derivatives, Fair Value, Positions not subject to master netting agreement	221,391,000	141,534,000
Liability Derivatives, Notional Amount	7,629,322,000	4,747,534,000
Liability Derivatives, Fair Value, Positions not subject to master netting agreement	404,867,000	21,784,000
Not Designated as Hedging Instrument [Member] | Interest rate derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	7,024,507,000	4,463,048,000
Derivative Asset, Fair Value, Gross Asset	221,225,000	141,243,000
Liability Derivatives, Notional Amount	7,022,844,000	4,372,846,000
Derivative Liability, Fair Value, Gross Liability	403,952,000	21,570,000
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives [Member] | RPA-Out [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	3,283,000	14,212,000
Derivative Asset, Fair Value, Gross Asset	32,000	80,000
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives [Member] | RPA-In [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Notional Amount	0	0
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	161,934,000	76,755,000
Derivative Asset, Fair Value, Gross Asset	134,000	211,000
Liability Derivatives, Notional Amount	606,478,000	374,688,000
Derivative Liability, Fair Value, Gross Liability	915,000	214,000
Not Designated as Hedging Instrument [Member] | CME SWAPS MARKETS (CME) [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amounts	2,700,000,000	400,000,000
Liability Derivatives, Notional Amount	0	2,600,000,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Other Commitment	$ 2,400,000	$ 1,000,000