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v3.23.1

Investments - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Jan. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,716,681,000 |  | $ 1,716,681,000 |  | $ 1,729,054,000
Cumulative net unamortized unrealized gain | $ 727,000 |  | $ 727,000 |  | $ 481,000
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |  | 10.00% |  | 10.00%
Securities pledged | $ 1,800,000,000 |  | $ 1,800,000,000 |  | $ 734,500,000
Mortgage-backed securities, weighted average life |  |  | 6 years |  |
Provision for credit losses on available-for-sale securities | 4,800,000 |  |  |  |
Charge-off | 4,800,000 |  |  |  |
Allowance for credit losses on available-for-sale securities | 0 |  | $ 0 |  | 0
Accrued interest receivable, held-to-maturity securities | 6,600,000 |  | 6,600,000 |  | 5,800,000
Allowance for credit losses on held-to-maturity debt securities | (872,000) |  | (872,000) |  | (735,000)
Sale of debt securities, available-for-sale |  | $ 28,400,000 | 28,741,000 | $ 0 |
Debt Securities, Available-for-sale, Realized Gain |  | $ 400,000 |  |  |
Other investments, at cost | 62,943,000 |  | 62,943,000 |  | 63,790,000
Reclassified to Held to Maturity |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Cumulative net unamortized unrealized gain | 16,800,000 |  | 16,800,000 |  | 17,600,000
Des Moines |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Other investments, at cost | $ 14,000,000 |  | $ 14,000,000 |  | $ 14,000,000

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