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v3.23.3

Investments - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Cumulative net unamortized unrealized gain |  | $ 8,000 |  | $ 8,000 |  | $ 481,000
Maximum percentage of shareholders' equity security holdings held of one issuer |  | 10.00% |  | 10.00% |  | 10.00%
Securities pledged |  | $ 1,400,000,000 |  | $ 1,400,000,000 |  | $ 734,500,000
Mortgage-backed securities, weighted average life |  |  |  | 5 years |  |
Provision for credit losses on available-for-sale securities |  |  |  | $ 5,000,000 |  |
Charge-off |  |  |  | 5,000,000 |  |
Allowance for credit losses on available-for-sale securities |  | 0 |  | 0 |  | 0
Accrued interest receivable, held-to-maturity securities |  | 6,700,000 |  | 6,700,000 |  | 5,800,000
Allowance for credit losses on held-to-maturity securities |  | 785,000 |  | 785,000 |  | 735,000
Sale of debt securities, available-for-sale | $ 28,400,000 | 0 | $ 0 | 28,741,000 | $ 0 |
Debt Securities, Available-for-sale, Realized Gain | $ 400,000 |  |  |  |  |
Other investments, at cost |  | 61,819,000 |  | 61,819,000 |  | 63,790,000
Reclassified to Held to Maturity |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Cumulative net unamortized unrealized gain |  | 15,000,000 |  | 15,000,000 |  | 17,600,000
Des Moines |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Other investments, at cost |  | $ 10,000,000 |  | $ 10,000,000 |  | $ 14,000,000

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