Commitments, Guarantees and Contingent Liabilities - Maximum obligation to extend credit (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments to make loans	$ 594,042	$ 957,533
Unused lines of credit	1,053,287	1,044,875
Standby letters of credit	17,761	18,632
Total	$ 1,665,090	$ 2,021,040