Investments - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Vertical risk retention interest		5.00%	5.00%
Increase in trading investments		$ 0	$ 0	$ 5,117
Trading investments		$ 53,262	$ 54,481
Number of government sponsored securities with unrealized losses | security		236	213
Number of mortgage-backed securities | security		278	248
Par value of mortgage-backed securities pledged to FRB		$ 610,000	$ 612,000
Non-marketable securities investment		24,000	14,000
Gain (loss) on non-marketable securities investment	$ (60,000)
Low income housing tax credit investments		13,000	11,000	9,000
Amount of amortization reported in income tax expense		10,000	9,000	$ 7,000
Total carrying value of LIHTC investments		82,000	72,000
Liability for unfunded commitments		$ 30,000	$ 30,000
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]		Deferred tax provision (benefit)
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]		Income tax expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]		Income tax expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]		Accretion (Amortization) of Discounts and Premiums, Investments
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]		Investments
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Non-marketable securities investment					$ 5,000