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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 0 | $ 0
Average life of investment grade debt securities, years | 7 years 6 months |
Credit-related impairment loss on investment securities held-to-maturity | $ 0 | 0
Investment in FHLB stock, impairment losses | $ 0 |
Debt securities weighted average remaining contractual maturity term | 23 years |
Total deposits | $ 11,433,642 | 12,836,245
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Average life of investment grade debt securities, years | 12 years 9 months 18 days |
United States [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 91.00% |
CMO/REMIC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment contractual cash flows guaranteed by Government, percentage | 100.00% |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total investment portfolio representing municipal bonds, percentage | 9.10% |
Securities Investment [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Pledged to secure amount | $ 2,260,000 | 1,560,000
Total deposits | 1,380,000 | 1,130,000
Pledged to secure unused borrowing capacity | 3,020,000 | 3,150,000
Secure Public Funds | 372,500 | 652,000
Outstanding borrowings | 1,800,000 | 550,000
Secured unused borrowing capacity | 796,000 | 105,000
Other purposes | $ 51,000 | $ 27,000

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 9A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-9A Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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