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Loan Portfolio and Allowance for Credit Losses - Aging of Recorded Investment in Past Due Loans by Loan Class and by Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans $ 5,290,178 $ 5,252,460
Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 10,617 11,556
New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 3,410,066 3,378,133
New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 7,664 8,497
Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,880,112 1,874,327
Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 2,953 3,059
Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 298,180 295,107
Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 248,332 245,799
Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 49,848 49,308
Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 18,583 18,336
Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 18,148 17,841
Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 435 495
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 4,432,725 4,399,224
First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 2,820,269 2,794,515
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,612,456 1,604,709
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 65,186 64,036
Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 47,642 46,421
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 17,544 17,615
Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 464,887 464,201
Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 268,011 265,060
Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 196,876 199,141
30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 6,284 6,368
30 - 59 Days Past Due [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 47 51
30 - 59 Days Past Due [Member] | New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 3,627 3,599
30 - 59 Days Past Due [Member] | New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 24 5
30 - 59 Days Past Due [Member] | Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 2,657 2,769
30 - 59 Days Past Due [Member] | Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 23 46
30 - 59 Days Past Due [Member] | Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1 0
30 - 59 Days Past Due [Member] | Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1 0
30 - 59 Days Past Due [Member] | Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
30 - 59 Days Past Due [Member] | Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
30 - 59 Days Past Due [Member] | Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 0 0
30 - 59 Days Past Due [Member] | Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
30 - 59 Days Past Due [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 5,482 4,857
30 - 59 Days Past Due [Member] | First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 3,138 3,174
30 - 59 Days Past Due [Member] | First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 2,344 1,683
30 - 59 Days Past Due [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 34 419
30 - 59 Days Past Due [Member] | Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 34 50
30 - 59 Days Past Due [Member] | Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 369
30 - 59 Days Past Due [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 720 1,041
30 - 59 Days Past Due [Member] | Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 430 370
30 - 59 Days Past Due [Member] | Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 290 671
60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,591 3,092
60 - 89 Days Past Due [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 18 32
60 - 89 Days Past Due [Member] | New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1,420 1,998
60 - 89 Days Past Due [Member] | New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 0 32
60 - 89 Days Past Due [Member] | Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 171 1,094
60 - 89 Days Past Due [Member] | Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 18 0
60 - 89 Days Past Due [Member] | Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 0 0
60 - 89 Days Past Due [Member] | Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 0 0
60 - 89 Days Past Due [Member] | Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,422 2,768
60 - 89 Days Past Due [Member] | First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1,269 1,790
60 - 89 Days Past Due [Member] | First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 153 978
60 - 89 Days Past Due [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 0 0
60 - 89 Days Past Due [Member] | Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
60 - 89 Days Past Due [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 151 292
60 - 89 Days Past Due [Member] | Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 151 176
60 - 89 Days Past Due [Member] | Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 116
90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 12,188 12,515
90+ Days Past Due [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 24 29
90+ Days Past Due [Member] | New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 10,406 10,252
90+ Days Past Due [Member] | New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 24 7
90+ Days Past Due [Member] | Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,782 2,263
90+ Days Past Due [Member] | Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 22
90+ Days Past Due [Member] | Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,961 1,984
90+ Days Past Due [Member] | Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1,961 1,984
90+ Days Past Due [Member] | Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
90+ Days Past Due [Member] | Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 7 7
90+ Days Past Due [Member] | Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 7 7
90+ Days Past Due [Member] | Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
90+ Days Past Due [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 8,832 8,979
90+ Days Past Due [Member] | First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 7,237 6,830
90+ Days Past Due [Member] | First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,595 2,149
90+ Days Past Due [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 232 266
90+ Days Past Due [Member] | Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 232 266
90+ Days Past Due [Member] | Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
90+ Days Past Due [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,132 1,250
90+ Days Past Due [Member] | Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 945 1,158
90+ Days Past Due [Member] | Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 187 92
Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 20,063 21,975
Past Due [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 89 112
Past Due [Member] | New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 15,453 15,849
Past Due [Member] | New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 48 44
Past Due [Member] | Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 4,610 6,126
Past Due [Member] | Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 41 68
Past Due [Member] | Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,962 1,984
Past Due [Member] | Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1,962 1,984
Past Due [Member] | Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
Past Due [Member] | Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 7 7
Past Due [Member] | Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 7 7
Past Due [Member] | Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 0
Past Due [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 15,736 16,604
Past Due [Member] | First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 11,644 11,794
Past Due [Member] | First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 4,092 4,810
Past Due [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 266 685
Past Due [Member] | Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 266 316
Past Due [Member] | Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 0 369
Past Due [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 2,003 2,583
Past Due [Member] | Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 1,526 1,704
Past Due [Member] | Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 477 879
Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 5,270,115 5,230,485
Current [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 10,528 11,444
Current [Member] | New York And Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 3,394,613 3,362,284
Current [Member] | New York And Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 7,616 8,453
Current [Member] | Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,875,502 1,868,201
Current [Member] | Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 2,912 2,991
Current [Member] | Commercial Real Estate [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 296,218 293,123
Current [Member] | Commercial Real Estate [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 246,370 243,815
Current [Member] | Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 49,848 49,308
Current [Member] | Other [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 18,576 18,329
Current [Member] | Other [Member] | New York And Other States [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 18,141 17,834
Current [Member] | Other [Member] | Florida [Member] | Commercial [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 435 495
Current [Member] | First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 4,416,989 4,382,620
Current [Member] | First Mortgages [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 2,808,625 2,782,721
Current [Member] | First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 1,608,364 1,599,899
Current [Member] | Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 64,920 63,351
Current [Member] | Home Equity Loans [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 47,376 46,105
Current [Member] | Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 17,544 17,246
Current [Member] | Home Equity Line of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans 462,884 461,618
Current [Member] | Home Equity Line of Credit [Member] | New York And Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans [1] 266,485 263,356
Current [Member] | Home Equity Line of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Recorded past due loans $ 196,399 $ 198,262
[1] Includes New York, New Jersey, Vermont and Massachusetts.