Investments - Narrative (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2022 USD ($) security	Sep. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract]
Vertical risk retention interest				5.00%
Increase in trading investments		$ 5,000		$ 5,117	$ 0	$ 0
Trading investments	$ 55,903			$ 55,903	$ 37,465
Number of government sponsored securities with unrealized losses | security	191			191	60
Number of mortgage-backed securities | security	194			194	180
Par value of mortgage-backed securities pledged to FRB	$ 547,000			$ 547,000	$ 888,000
Gain (loss) on non-marketable securities investment	(60,000)		$ 35,000
Non-marketable securities investment	8,000			8,000	69,000
Low income housing tax credit investments				9,000	7,000	6,000
Amount of amortization reported in income tax expense				7,000	6,000	$ 5,000
Total carrying value of LIHTC investments	80,000			80,000	68,000
Liability for unfunded commitments	$ 46,000			$ 46,000	$ 30,000