Securities (Net Gains and Losses on Trading Account Securities) (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Net gain on sales transactions | $ 3,129 | $ 1,014 | $ 1,102 |
| Net mark-to-market gains (losses) | (230) | (75) | 85 |
| Net gain on trading account securities | $ 2,899 | $ 939 | $ 1,187 |