Fair Value Measurements - Valuation of Financial Instruments That are Marked-to-Market on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Trading investments	$ 53,732	$ 53,262
Available-for-sale investments	1,656,977	1,933,226
Derivative instruments	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Net	Other Assets, Net
Liabilities:
Derivative instruments	$ (23)	$ (40)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Fair Value Measurements on a Recurring Basis
Assets:
Trading investments	$ 53,732	$ 53,262
Available-for-sale investments	1,656,977	1,933,226
Loans held for sale	0	0
Derivative instruments	0	0
Total earning assets	1,710,709	1,986,488
Liabilities:
Derivative instruments	(23)	(40)
Fair Value Measurements on a Recurring Basis | Level 1
Assets:
Trading investments	0	0
Available-for-sale investments	0	0
Loans held for sale	0	0
Derivative instruments	0	0
Total earning assets	0	0
Liabilities:
Derivative instruments	0	0
Fair Value Measurements on a Recurring Basis | Level 2
Assets:
Trading investments	2,436	0
Available-for-sale investments	1,654,505	1,930,537
Loans held for sale	0	0
Derivative instruments	0	0
Total earning assets	1,656,941	1,930,537
Liabilities:
Derivative instruments	(23)	(40)
Fair Value Measurements on a Recurring Basis | Level 3
Assets:
Trading investments	51,296	53,262
Available-for-sale investments	2,472	2,689
Loans held for sale	0	0
Derivative instruments	0	0
Total earning assets	53,768	55,951
Liabilities:
Derivative instruments	$ 0	$ 0