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Investment Securities - Textuals (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summary of Investment Holdings [Line Items] |  |  |  |
Transfer of investment securities available for sale to held to maturity | $ 244,800,000 | $ 0 | $ 244,778,000 | $ 0
Investment securities classified as trading | 0 | 0 | 0 |
Investment securities classified as held to maturity | 383,393,000 | 766,396,000 | 383,393,000 |
ACL on investment securities available for sale | $ 0 | 0 | 0 |
Investment securities held to maturity classified as past due |  | 0 |  |
Investment securities held to maturity classified as nonaccrual |  | 0 |  |
ACL on investment securities held to maturity |  | 0 |  |
Accrued interest write off on investment securities available for sale |  | 0 | 0 | 0
Accrued interest write off on investment securities held to maturity |  | $ 0 | $ 0 | $ 0
Common Stock, Shares, Outstanding | 35,105,779 | 35,106,697 | 35,105,779 |
Net Change Interest-Bearing Domestic Deposits, Money Market |  | $ (56,931,000) |  |
Common Class B |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Common Stock, Shares, Outstanding |  | 6,549 |  |
Common Stock, Value, Outstanding |  | $ 0 |  |
Held-to-maturity Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Accrued interest receivable | $ 1,100,000 | 2,400,000 | $ 1,100,000 |
Available-for-sale Securities [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Accrued interest receivable | $ 3,500,000 | $ 4,800,000 | $ 3,500,000 |

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