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BORROWINGS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
Borrowings outstanding under BTFP | $ 1,745,000 | $ 1,016,000
Federal Home Loan Bank of Des Moines |  |
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
FHLB stock | 55,300 | 49,300
Federal Reserve Bank Advances |  |
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
Available borrowing capacity | 710,000 | 340,000
Federal Home Loan Bank Advances | Federal Home Loan Bank of Des Moines |  |
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
Available borrowing capacity | 2,100,000 | $ 2,600,000
Bank Term Funding Program | Federal Reserve Bank Advances |  |
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
Borrowings outstanding under BTFP | 645,000 |
Bank Term Funding Program | Federal Reserve Bank Advances |  |
Federal Home Loan Bank and Other Borrowings [Line Items] |  |
Amount borrowed from Federal Reserve Bank | 1,200,000 |
Amount repaid to Federal Reserve Bank | $ 535,000 |

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