Short-Term Borrowings and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Short-Term Debt [Line Items]
Total FHLB advances	$ 3,500,000	$ 0
Weighted-average contractual interest rates for FHLB advances	4.48%
Floating
Short-Term Debt [Line Items]
Total FHLB advances	$ 3,000,000	0
Fixed
Short-Term Debt [Line Items]
Total FHLB advances	$ 500,000	$ 0
Minimum | Floating
Short-Term Debt [Line Items]
Interest Rate	4.56%
Minimum | Fixed
Short-Term Debt [Line Items]
Interest Rate	3.87%
Maximum | Floating
Short-Term Debt [Line Items]
Interest Rate	4.61%
Maximum | Fixed
Short-Term Debt [Line Items]
Interest Rate	3.95%
Bank Term Funding Program
Short-Term Debt [Line Items]
Interest rate short-term borrowings		4.37%
Short-term borrowings	$ 0	$ 4,500,000
Junior subordinated debt
Short-Term Debt [Line Items]
Long-term debt total	$ 35,000
Junior subordinated debt | MCBI Statutory Trust I
Short-Term Debt [Line Items]
Debt instrument, basis spread on variable rate	1.81%
Parent company | Junior subordinated debt
Short-Term Debt [Line Items]
Weighted-average rate (as a percent)	6.17%	6.87%
Long-term debt total	$ 32,001	$ 148,249