Federal Home Loan Bank Advances and Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Short-Term Debt [Line Items]
Total FHLB advances	$ 3,000,000	$ 3,500,000
Weighted-average contractual interest rates for FHLB advances	3.94%
Floating
Short-Term Debt [Line Items]
Total FHLB advances	$ 2,000,000	3,000,000
Fixed
Short-Term Debt [Line Items]
Total FHLB advances	$ 750,000	500,000
Overnight
Short-Term Debt [Line Items]
Interest Rate	4.02%
Total FHLB advances	$ 250,000	$ 0
Minimum | Floating
Short-Term Debt [Line Items]
Interest Rate	3.87%
Minimum | Fixed
Short-Term Debt [Line Items]
Interest Rate	3.87%
Maximum | Floating
Short-Term Debt [Line Items]
Interest Rate	3.96%
Maximum | Fixed
Short-Term Debt [Line Items]
Interest Rate	4.01%
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)	5.53%	6.17%
Long-term debt total	$ 32,320	$ 32,001