Investments - Narrative (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2023 USD ($) security	Mar. 31, 2023 USD ($) security	Mar. 31, 2023 USD ($) security Rate	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Vertical risk retention interest		5.00%	5.00%
Trading investments	$ 51,342	$ 51,342	$ 51,342	$ 55,903
Number of government sponsored securities with unrealized losses | security	182	182	182	191
Number of mortgage-backed securities | security	193	193	193	194
Par value of mortgage-backed securities pledged to FRB	$ 530,000	$ 530,000	$ 530,000	$ 547,000
Non-marketable securities investment	14,000	14,000	14,000	8,000
Low income housing tax credit investments	78,000	78,000	78,000	80,000
Low income housing tax credit investments, liability for unfunded commitments	40,000	$ 40,000	40,000	46,000
Low income housing tax credit investments, tax credits and benefits (less than)	1,000			9,000
Low income housing tax credit investments, expected tax benefits recognized		25.00%
Convertible Debt Securities
Debt Securities, Available-for-sale [Line Items]
Trading investments				$ 5,000
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Non-marketable securities investment	$ 5,000	$ 5,000	$ 5,000