Short-Term Borrowings and Long-Term Debt - Preferred Subordinated Debentures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Texas Capital Statutory Trust I
Subordinated Borrowing [Line Items]
Trust preferred securities issued	$ 10,310
Texas Capital Statutory Trust I \| Trust preferred subordinated debentures
Subordinated Borrowing [Line Items]
Interest rate on subordinated debentures	3.61%
Texas Capital Statutory Trust II
Subordinated Borrowing [Line Items]
Trust preferred securities issued	$ 10,310
Texas Capital Statutory Trust II \| Trust preferred subordinated debentures
Subordinated Borrowing [Line Items]
Interest rate on subordinated debentures	3.51%
Texas Capital Statutory Trust III
Subordinated Borrowing [Line Items]
Trust preferred securities issued	$ 25,774
Texas Capital Statutory Trust III \| Trust preferred subordinated debentures
Subordinated Borrowing [Line Items]
Interest rate on subordinated debentures	1.77%
Texas Capital Statutory Trust IV
Subordinated Borrowing [Line Items]
Trust preferred securities issued	$ 25,774
Texas Capital Statutory Trust IV \| Trust preferred subordinated debentures
Subordinated Borrowing [Line Items]
Interest rate on subordinated debentures	1.86%
Texas Capital Statutory Trust V
Subordinated Borrowing [Line Items]
Trust preferred securities issued	$ 41,238
Texas Capital Statutory Trust V \| Trust preferred subordinated debentures
Subordinated Borrowing [Line Items]
Interest rate on subordinated debentures	1.97%