Nature of Operations and Summary of Significant Accounting Policies - Nature of Operations and Principles of Consolidation (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) location Institution	Dec. 31, 2021 USD ($)
Loans
Assets held in an agency or fiduciary capacity | $	$ 1,157,837	$ 1,325,894
Number of peer institutions | Institution	30
Orange County
Loans
Number of offices in New York	8
Westchester County
Loans
Number of offices in New York	7
Rockland County
Loans
Number of offices in New York	2
Bronx County
Loans
Number of offices in New York	1