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Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) Holding | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) Holding
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 | $ 13,123 |  | $ 13,047
Securities with an aggregate fair value | 1,800,000 |  | 1,800,000
Proceeds from sale of available-for-sale securities | 0 | $ 222,668 |
Net unrealized gains on available-for-sale securities included in AOCI | 24,800 |  | 46,900
Accrued interest receivable | 68,896 |  | 66,790
Federal home loan bank stock, Total | 29,300 |  | 34,000
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 |  |
Held-to-maturity Securities [Member] |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |
Accrued interest receivable | 6,300 |  | $ 5,300
Grantor Trusts [Member] |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |
Equities securities | $ 10,100 |  |

X
- Definition 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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