Debt Securities - Credit Quality Indictors for HTM Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	$ 3,261,575	$ 3,294,847
Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	1,613,709	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	409,972	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	1,168,257	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	31,147	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	$ 4,333	$ 3,627