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Other Borrowings - Additional Information (Detail) | Dec. 31, 2022 USD ($)
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Debt Disclosure [Abstract] |
Repurchase investment securities sold and pledged as collateral under securities repurchase agreement | $ 47,905,000
FHLB collateral line of credit, maximum borrowings capacity | 2,485,905,000
Loans designated as potential collateral under collateralized line of credit with FHLB | 80,187,000
Investment securities designated as potential collateral under collateral line of credit | 4,389,161,000
Collateralized line of credit with San Francisco Federal Reserve Bank, maximum borrowings capacity | 299,689,000
Collateralized line of credit with San Francisco Federal Reserve Bank, outstanding balance | 0
Investment securities designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank | 5,000
Loans designated as potential collateral under collateral line of credit with San Francisco Federal Reserve Bank | 424,946,000
Unused correspondent banking lines of credit from commercial banks for federal funds | $ 30,000,000

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