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Borrowings and Other Arrangements - Short-term borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Other Borrowings [Member]    
Short-term Debt [Line Items]    
Amount $ 80,000 $ 360,500
Weighted average rate 4.62% 4.27%
Overnight Fed funds purchased [Member]    
Short-term Debt [Line Items]    
Amount   $ 130,000
Weighted average rate 6.60% 5.25%
Short-term FHLB advance [Member]    
Short-term Debt [Line Items]    
Amount   $ 150,500
Weighted average rate 5.73% 3.73%
Long-term FHLB advance [Member]    
Short-term Debt [Line Items]    
Amount $ 80,000 $ 80,000
Weighted average rate 3.91% 3.91%