Borrowings - Schedules of Short-term Borrowings and Long-term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jan. 31, 2024	Dec. 31, 2023	Aug. 05, 2014
Long-Term Borrowings
Available capacity	$ 1,888,535		$ 2,490,213
Total borrowings, gross	1,707,059		1,400,587
Unamortized Deferred Issuance Costs	(52)		(82)
Total borrowings	1,707,007		$ 1,400,505
Borrowings - Principal	2,200,000
Investment securities pledged with collateral par	297,500
Asset Pledged as Collateral
Long-Term Borrowings
Available capacity	$ 1,900,000
Subordinated notes, 5.75%
Long-Term Borrowings
Interest rate (as a percent)	5.75%		5.75%	5.75%
Long-term borrowings, gross	$ 70,000		$ 70,000
Unamortized Deferred Issuance Costs	(52)		(82)
Subordinated notes, net	69,948		69,918
Customer repurchase agreements
Long-Term Borrowings
Short-term borrowings	$ 37,059		$ 30,587
Interest rate (as a percent)	3.48%		3.42%
FHLB | Secured Debt
Long-Term Borrowings
Short-term borrowings	$ 600,000		$ 0
Available capacity	1,302,153		1,271,846
BTFP | Secured Debt
Long-Term Borrowings
Short-term borrowings	1,000,000		1,300,000
Available capacity	$ 0		$ 598,870
Interest rate (as a percent)	4.76%	4.76%	4.53%
Discount window | Secured Debt
Long-Term Borrowings
Available capacity	$ 568,602		$ 601,504
Raymond James repurchase agreement | Secured Debt
Long-Term Borrowings
Available capacity	$ 17,780		$ 17,993