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Loans and Allowance for Loan Losses, Impaired Receivables (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Impaired loans by loans class [Abstract]    
Recorded Investment $ 21,638 $ 24,280
Unpaid Principal Balance 22,737 26,310
Related Allowance 0 0
Average Recorded Investment 22,700 24,750
New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 18,831 20,974
Unpaid Principal Balance [1] 19,824 22,898
Related Allowance [1] 0 0
Average Recorded Investment [1] 19,903 21,762
Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 2,807 3,306
Unpaid Principal Balance 2,913 3,412
Related Allowance 0 0
Average Recorded Investment 2,798 2,988
Commercial [Member] | Commercial Real Estate [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 994 2,148
Unpaid Principal Balance 1,164 3,120
Related Allowance 0 0
Average Recorded Investment 1,251 2,711
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 994 2,148
Unpaid Principal Balance [1] 1,164 3,120
Related Allowance [1] 0 0
Average Recorded Investment [1] 1,251 2,711
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Commercial [Member] | Other [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 139 100
Unpaid Principal Balance 139 100
Related Allowance 0 0
Average Recorded Investment 113 87
Commercial [Member] | Other [Member] | New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 139 100
Unpaid Principal Balance [1] 139 100
Related Allowance [1] 0 0
Average Recorded Investment [1] 113 87
Commercial [Member] | Other [Member] | Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 17,204 18,557
Unpaid Principal Balance 17,872 19,353
Related Allowance 0 0
Average Recorded Investment 18,208 18,843
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 14,738 15,850
Unpaid Principal Balance [1] 15,300 16,540
Related Allowance [1] 0 0
Average Recorded Investment [1] 15,588 16,508
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 2,466 2,707
Unpaid Principal Balance 2,572 2,813
Related Allowance 0 0
Average Recorded Investment 2,620 2,335
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 342 359
Unpaid Principal Balance 362 380
Related Allowance 0 0
Average Recorded Investment 351 355
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 255 270
Unpaid Principal Balance [1] 275 291
Related Allowance [1] 0 0
Average Recorded Investment [1] 263 263
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 87 89
Unpaid Principal Balance 87 89
Related Allowance 0 0
Average Recorded Investment 88 92
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 2,959 3,116
Unpaid Principal Balance 3,200 3,357
Related Allowance 0 0
Average Recorded Investment 2,777 2,754
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment [1] 2,705 2,606
Unpaid Principal Balance [1] 2,946 2,847
Related Allowance [1] 0 0
Average Recorded Investment [1] 2,687 2,193
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]    
Impaired loans by loans class [Abstract]    
Recorded Investment 254 510
Unpaid Principal Balance 254 510
Related Allowance 0 0
Average Recorded Investment $ 90 $ 561
[1] Includes New York, New Jersey, Vermont and Massachusetts.