Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable [Abstract]
Total loans, net		$ 5,156,701		$ 5,098,058
Less: Allowance for credit losses on loans		51,265	$ 50,606	50,248	$ 49,772	$ 49,220	$ 48,578
Net loans		5,105,436		5,047,810
New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	3,318,085		3,277,169
Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,838,616		1,820,889
Real Estate Construction Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		37,200		29,700
Residential Borrowers [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		9,900		10,700
Commercial Borrowers Residential Purpose [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		27,300		19,000
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		314,273		286,857
Less: Allowance for credit losses on loans		3,134	3,023	3,420	3,429	2,742	2,735
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		292,571		267,300
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	252,211		227,771
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		40,360		39,529
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		21,702		19,557
Commercial [Member] | Other [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	21,289		19,144
Commercial [Member] | Other [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		413		413
Commercial [Member] | PPP Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		144		241
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,829,750		4,797,563
Less: Allowance for credit losses on loans		47,877	47,307	46,636	46,129	46,295	45,625
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,336,709		4,331,563
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	2,741,357		2,741,334
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,595,352		1,590,229
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		57,608		56,739
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, net	[1]	43,312		43,096
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		14,296		13,643
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		435,433		409,261
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, net	[1]	250,752		235,939
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		184,681		173,322
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		12,678		13,638
Less: Allowance for credit losses on loans		254	$ 276	192	$ 214	$ 183	$ 218
Installment [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	9,164		9,885
Installment [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		$ 3,514		$ 3,753

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