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Loans and Allowance for Loan Losses, Past Due (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due $ 22,938 $ 22,272
Current 3,718,217 3,614,135
Total loans 3,741,155 3,636,407
Loans that are 90 days past due and still accruing interest $ 0 $ 0
Number of days past due 90 days 90 days
New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] $ 21,489 $ 20,557
Current [1] 2,835,702 2,775,436
Total loans [1] 2,857,191 2,795,993
Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 1,449 1,715
Current 882,515 838,699
Total loans 883,964 840,414
30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 4,198 6,673
30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 3,674 6,393
30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 524 280
60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 2,014 1,514
60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 2,009 1,509
60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 5 5
90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 16,726 14,085
90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 15,806 12,655
90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 920 1,430
Commercial [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total loans 190,904 186,207
Commercial [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total loans [1] 180,022 172,974
Commercial [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total loans 10,882 13,233
Commercial [Member] | Commercial Real Estate [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 615 1,689
Current 164,707 160,203
Total loans 165,322 161,892
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 615 1,689
Current [1] 154,135 147,679
Total loans [1] 154,750 149,368
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Current 10,572 12,524
Total loans 10,572 12,524
Commercial [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 183
Commercial [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 0 183
Commercial [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 174 174
Commercial [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 174 174
Commercial [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Commercial Real Estate [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 441 1,332
Commercial [Member] | Commercial Real Estate [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 441 1,332
Commercial [Member] | Commercial Real Estate [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Other [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 108 100
Current 25,474 24,215
Total loans 25,582 24,315
Commercial [Member] | Other [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 108 100
Current [1] 25,164 23,506
Total loans [1] 25,272 23,606
Commercial [Member] | Other [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Current 310 709
Total loans 310 709
Commercial [Member] | Other [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 8 0
Commercial [Member] | Other [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 8 0
Commercial [Member] | Other [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Other [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Other [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 0 0
Commercial [Member] | Other [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 100 100
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 100 100
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Real Estate Mortgage - 1 to 4 Family [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total loans 3,540,942 3,441,437
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 19,052 17,664
Current 3,141,705 3,034,413
Total loans 3,160,757 3,052,077
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 17,784 15,983
Current [1] 2,330,144 2,270,165
Total loans [1] 2,347,928 2,286,148
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 1,268 1,681
Current 811,561 764,248
Total loans 812,829 765,929
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 3,375 5,946
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 2,957 5,669
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 418 277
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 1,584 1,300
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 1,584 1,300
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 14,093 10,418
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 13,243 9,014
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 850 1,404
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 228 51
Current 84,166 80,393
Total loans 84,394 80,444
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 177 51
Current [1] 68,946 66,404
Total loans [1] 69,123 66,455
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 51 0
Current 15,220 13,989
Total loans 15,271 13,989
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 51 6
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 0 6
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 51 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 13 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 13 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 164 45
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 164 45
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 2,827 2,646
Current 292,964 306,270
Total loans 295,791 308,916
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 2,717 2,646
Current [1] 249,128 260,629
Total loans [1] 251,845 263,275
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 110 0
Current 43,836 45,641
Total loans 43,946 45,641
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 690 489
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 650 489
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 40 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 212 18
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 212 18
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 0 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 1,925 2,139
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 1,855 2,139
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 70 0
Installment [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 108 122
Current 9,201 8,641
Total loans 9,309 8,763
Installment [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 88 88
Current [1] 8,185 7,053
Total loans [1] 8,273 7,141
Installment [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 20 34
Current 1,016 1,588
Total loans 1,036 1,622
Installment [Member] | 30-59 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 74 49
Installment [Member] | 30-59 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 59 46
Installment [Member] | 30-59 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 15 3
Installment [Member] | 60-89 Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 31 22
Installment [Member] | 60-89 Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 26 17
Installment [Member] | 60-89 Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 5 5
Installment [Member] | 90+ Days Past Due [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due 3 51
Installment [Member] | 90+ Days Past Due [Member] | New York and Other States [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due [1] 3 25
Installment [Member] | 90+ Days Past Due [Member] | Florida [Member]    
Aging of the recorded investment in past due loans [Abstract]    
Total 30+ days Past Due $ 0 $ 26
[1] Includes New York, New Jersey, Vermont and Massachusetts.