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Borrowing Arrangements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Other borrowings $ 457,685 $ 509,820
FHLB borrowings 312,466 212,648
Other borrowings:    
Debt Instrument [Line Items]    
Other borrowings 457,685 509,820
Average amount outstanding during the period [1] 229,464 436,676
Maximum amount outstanding during the period [2] $ 457,685 $ 1,030,421
Weighted average interest rate during the period [3] 5.50% 4.90%
Interest rate at end of the period [4] 5.30% 5.00%
FHLB borrowings:    
Debt Instrument [Line Items]    
FHLB borrowings $ 312,466 $ 212,648
Average amount outstanding during the period [1] 607,033 276,584
Maximum amount outstanding during the period [2] $ 702,527 $ 533,242
Weighted average interest rate during the period [3] 3.90% 2.50%
Interest rate at end of the period [5] 3.00% 1.20%
[1] The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.
[2] The maximum amount outstanding at any month-end during the period.
[3] The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on other borrowings and FHLB borrowings includes the effect of interest rate swaps.
[4] Stated rate.
[5] The interest rate on FHLB borrowings includes the effect of interest rate swaps.