Debt Securities - Credit Quality Indictors for HTM Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	$ 3,206,133	$ 3,294,847
Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	1,600,848	1,619,850
Investment Grade \| S&P: AAA \| Moody's: Aaa \| Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	404,714	414,147
Investment Grade \| S&P: AA+, AA, AA- \| Moody's: Aa1, Aa2, Aa3 \| Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	1,161,795	1,168,491
Investment Grade \| S&P: A+, A, A- \| Moody's: A1, A2, A3 \| Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	30,572	33,585
Investment Grade \| S&P: Not Rated \| Moody's: Not Rated \| Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	$ 3,767	$ 3,627