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Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Holding	Dec. 31, 2020 USD ($) Holding	Dec. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2018 USD ($)
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity | Holding	0	0
Equities securities	$ 13,466,000	$ 13,047,000
Securities with aggregate fair value	2,100,000,000	1,800,000,000
Proceeds from sale of available-for-sale securities	0	226,099,000	$ 125,839,000
Net unrealized gains (losses) on available-for-sale securities included in AOCI	(4,700,000)	46,900,000	20,700,000
Current expected credit losses to opening retained earnings	2,693,166,000	2,756,737,000	2,593,921,000		$ 1,978,827,000
Accrued interest receivable	60,844,000	66,790,000
Federal home loan bank stock, Total	15,900,000	34,000,000.0
Held-to-maturity Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Accrued interest receivable	7,000,000.0	5,300,000
Cumulative Effect, Period of Adoption, Adjustment [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Current expected credit losses to opening retained earnings			(26,591,000)
Retained Earnings [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Current expected credit losses to opening retained earnings	977,765,000	831,688,000	824,694,000		$ 737,581,000
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Current expected credit losses to opening retained earnings			$ (26,591,000)
Us Government Securities and Mortgage Backed and Collateralized Securities Issued By Direct Governmental Entity or Government-Sponsored Entity [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated credit losses	0
ASU 2016-13 [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated credit losses	$ 58,000	(97,000)
ASU 2016-13 [Member] | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Current expected credit losses to opening retained earnings				$ 200,000
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities		$ 10,600,000

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Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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