Borrowed Funds - Borrowed Funds and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due in 2023/2024	$ 0
Due in 2023/2024, weighted average rate	0.00%
Subordinated debentures	$ 187,630	$ 186,965
Junior subordinated debentures - adjustable rate Due in 2037	$ 47,850	$ 50,507
Junior subordinated debentures - adjustable rate Due in 2037	9.14%	7.44%
Total borrowed funds	$ 841,281	$ 1,052,973
Weighted average interest rate (as a percent)	5.06%	4.32%
FHLB-NY
Due in 2023/2024		$ 815,501
Due in 2023/2024, weighted average rate		4.08%
Due in 2024/2025	$ 145,750
Due in 2024/2025, weighted average rate	5.53%
Due in 2025/2026	$ 14,675
Due in 2025/2026, weighted average rate	4.90%
Due in 2026/2027	$ 108,244
Due in 2026/2027, weighted average rate	4.71%
Due in 2027/2028	$ 185,017
Due in 2027/2028, weighted average rate	4.63%
Due in 2028	$ 27,115
Due in 2028, weighted average rate	3.83%
Federal Home Loan Bank advances and other borrowings	$ 480,801	$ 815,501
us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	$ 108,244
FHLB-NY | Weighted Average [Member]
Total FHLB-NY advances, weighted average rate	4.88%	4.08%
Other Borrowings | Other Borrowings Due in 2024
Unsecured debt	$ 125,000
Weighted average interest rate (as a percent)	4.99%
Subordinated Debentures.
Subordinated debentures	$ 187,630	$ 186,965
Weighted average interest rate (as a percent)	4.53%	4.55%
Subordinated Debentures. | Due in 2031
Subordinated debentures	$ 123,700	$ 123,285
Weighted average interest rate (as a percent)	3.51%	3.52%
Subordinated Debentures. | Due in 2032
Subordinated debentures	$ 63,930	$ 63,680
Weighted average interest rate (as a percent)	6.52%	6.54%