Commitments and Contingencies - Commitments and Letters of Credit (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Commitments and letters of credit	$ 2,760,395	$ 2,671,292
Commitments to extend credit
Other Commitments [Line Items]
Commitments and letters of credit	2,689,993	2,583,957
Standby letters of credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 70,402	$ 87,335