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Borrowings - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Disclosure [Abstract] |  |  |
Pledged loans receivable, carrying value | $ 2,360,000,000 |  |
Total borrowing capacity available from the collateral | 1,540,000,000 |  |
Remaining available borrowing capacity | 1,090,000,000.00 |  |
Available for use through the Federal Reserve Bank of San Francisco discount window | 23,200,000 | $ 22,000,000 |
Pledged loans, carrying values | 24,800,000 | 23,400,000 |
Outstanding borrowing capacity | 0 | 0 |
Borrowings | 0 |  |
Advances from the FHLB | 325,000,000 | 350,000,000.0 |
Decrease in the advances from the FHLB |  | 25,000,000 |
Open advances | 212,500,000 | 250,000,000 |
Term borrowings | 112,500,000 | 100,000,000 |
Interest expense on FHLB | $ 6,900,000 | $ 2,200,000 | $ 1,700,000
FHLB, advances, weighted average interest rate | 4.69% | 3.57% |
FHLB, advances, weighted-average interest rate during the year | 3.48% | 1.52% | 1.17%
Open advances (percent) | 5.70% | 4.65% |
Weighted average interest rate of outstanding advances (percent) | 2.77% | 0.87% |

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- Definition Borrowing capacity available based on pledged collateral. + References No definition available. + Details
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