Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable [Abstract]
Total loans		$ 4,629,491
Less: Allowance for credit losses on loans		45,517		$ 44,267	$ 47,350		$ 49,595
Net loans		4,583,974
Total loans, net				4,438,779
Less: Allowance for credit losses on loans			$ 45,285	44,267	47,350	$ 50,155
Net loans				4,394,512
New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	3,187,037
Total loans, net	[1]			3,132,378
Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		1,442,454
Total loans, net				1,306,401
Real Estate Construction Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans		36,600		37,300
Residential Borrowers [Member]
Loans and Leases Receivable [Abstract]
Total loans		14,100		17,900
Commercial Borrowers Residential Purpose [Member]
Loans and Leases Receivable [Abstract]
Total loans		22,500		19,400
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans		217,120
Less: Allowance for credit losses on loans		2,429		3,135	3,253		4,140
Total loans, net				200,200
Less: Allowance for credit losses on loans			2,274	3,135	3,253	4,106
Commercial [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net				177,952
Commercial [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net				22,248
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans		197,158
Total loans, net				168,716
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	165,888
Total loans, net	[1]			147,063
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		31,270
Total loans, net				21,653
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans		19,962
Total loans, net				31,484
Commercial [Member] | Other [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	19,089
Total loans, net	[1]			30,889
Commercial [Member] | Other [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		873
Total loans, net				595
Commercial [Member] | PPP Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans		1,400		10,000
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans		4,401,706
Less: Allowance for credit losses on loans		42,944		40,689	43,653		44,950
Total loans, net				4,229,163
Less: Allowance for credit losses on loans			42,880	40,689	43,653	45,617
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans		4,074,713
Total loans, net				3,936,302
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	2,762,616
Total loans, net	[1]			2,723,734
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		1,312,097
Total loans, net				1,212,568
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans		57,652
Total loans, net				61,885
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	45,115
Total loans, net	[1]			48,190
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		12,537
Total loans, net				13,695
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans		269,341
Total loans, net				230,976
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	186,146
Total loans, net	[1]			175,134
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		83,195
Total loans, net				55,842
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans		10,665
Less: Allowance for credit losses on loans		144		443	444		$ 505
Total loans, net				9,416
Less: Allowance for credit losses on loans			$ 131	443	$ 444	$ 432
Installment [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans	[1]	8,183
Total loans, net	[1]			7,368
Installment [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans		$ 2,482
Total loans, net				$ 2,048

[1] Includes New York, New Jersey, Vermont and Massachusetts.