Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Off-balance-sheet, credit loss, liability	$ 3,367	$ 3,324	$ 605
Commitments to Extend Credit
Other Commitments [Line Items]
Contractual obligation	1,200,000	1,200,000
Standby Letters of Credit
Other Commitments [Line Items]
Contractual obligation	$ 48,900	$ 45,200