First Interstate BancSystem(FIBK) - 2023 Q2 - Quarterly Report

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS (Dollars in millions, except share and per share data) As of June 30, 2023 and December 31, 2022, the Company has amortized costs of $7,227.8 million and$4,998.9 million, respectively, for investment securities pledged to secure public deposits and securities sold under repurchase agreements that had estimated fair values of $6,455.1 million and$4,432.0 million, as of June 30, 2023 and December 31, 2022, respectively. All securities sold under repurchas ...