Debt Securities - Credit Quality Indicators for HTM Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	$ 3,294,847	$ 3,502,411
Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	1,619,850	1,650,000
Moody's: Aaa Rating | S&P: AAA Rating | Internal Investment Grade | Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	414,147	427,918
Moody's: Aa1, Aa2 or Aa3 Ratings | S&P: AA+, AA or AA- Ratings | Internal Investment Grade | Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	1,168,491	1,182,894
Moody's: A1, A2 or A3 Ratings | S&P: A+, A or A- Ratings | Internal Investment Grade | Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	33,585	37,742
Moody's: Not Rated | S&P: Not Rated | Internal Investment Grade | Municipal Bonds
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]
Total municipal bonds held-to-maturity	$ 3,627	$ 1,446