Mergers and Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 01, 2025	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Business Combination [Line Items]
Goodwill		$ 1,406,667	$ 1,405,840	$ 988,898
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract]
Goodwill		$ 827
The First
Business Combination [Line Items]
Cash and cash equivalents	$ 263,352
Securities	1,457,377
Loans, including loans held for sale	5,173,334
Premises and equipment	181,754
Bank-owned life insurance	146,601
Other real estate owned	11,032
Core deposit intangible	165,476
Other assets	173,885
Total assets	7,572,811
Deposits	6,449,393
Borrowings	419,165
Other liabilities	69,759
Total liabilities	6,938,317
Net identifiable assets acquired over liabilities assumed	634,494
Goodwill	418,196
Net assets acquired over liabilities assumed	1,052,690
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract]
Goodwill	827
The First | Measurement Period Adjustments
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill [Abstract]
Cash and cash equivalents	0
Securities	0
Loans, including loans held for sale	0
Premises and equipment	(2,125)
Bank-owned life insurance	0
Other real estate owned	0
Core deposit intangible	0
Other assets	1,742
Total assets	(383)
Deposits	0
Borrowings	0
Other liabilities	444
Total liabilities	444
Net identifiable assets acquired over liabilities assumed	(827)
Goodwill	827
Net assets acquired over liabilities assumed	0
Fair Value of Net Assets Acquired
Business Combination [Line Items]
Cash and cash equivalents	263,352
Securities	1,457,377
Loans, including loans held for sale	5,173,334
Premises and equipment	179,629
Bank-owned life insurance	146,601
Other real estate owned	11,032
Core deposit intangible	165,476
Other assets	175,627
Total assets	7,572,428
Deposits	6,449,393
Borrowings	419,165
Other liabilities	70,203
Total liabilities	6,938,761
Net identifiable assets acquired over liabilities assumed	633,667
Goodwill	419,023
Net assets acquired over liabilities assumed	$ 1,052,690