Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 344,400	$ 351,100
Mortgage loans sold	3,146,442	7,441,705	$ 7,624,799
Liability for estimated losses on repurchase and indemnification claims	624	675
Losses charged against liability	60	219
Unfunded commitments to investment partnerships	50,900	40,300
Commitments to invest in partnership for tax credits	7,100
Customer balances maintained by clearing broker and subject to indemnification	15,800	22,500
Forward contracts
Commitments And Contingencies [Line Items]
Derivative instrument, contractual amounts	321,000	952,300
Commercial, commercial real estate, and construction loans | Commitments to extend credit
Commitments And Contingencies [Line Items]
Commitments to fund	9,500,000	7,800,000
Unused home equity lines | Commitments to extend credit
Commitments And Contingencies [Line Items]
Commitments to fund	796,900	749,400
Residential real estate | Commitments to extend credit
Commitments And Contingencies [Line Items]
Commitments to fund	$ 181,000	$ 590,000