Loans and Allowance for Loan Losses, Impaired Receivables (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Impaired loans by loans class [Abstract]
Recorded Investment	$ 24,600	$ 13,700
New York and other states [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	20,581	8,006
Unpaid Principal Balance	22,954	9,289
Related Allowance	0	0
Average Recorded Investment	10,599	6,987
New York and other states [Member] | Commercial [Member] | Commercial real estate [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	5,755	4,968
Unpaid Principal Balance	6,180	5,684
Related Allowance	0	0
Average Recorded Investment	5,509	5,198
New York and other states [Member] | Commercial [Member] | Other [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	125	13
Unpaid Principal Balance	182	32
Related Allowance	0	0
Average Recorded Investment	102	56
New York and other states [Member] | Real estate mortgage - 1 to 4 family [Member] | First mortgages [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	12,501	2,874
Unpaid Principal Balance	14,153	3,299
Related Allowance	0	0
Average Recorded Investment	4,555	1,664
New York and other states [Member] | Real estate mortgage - 1 to 4 family [Member] | Home Equity Loans [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	619	151
Unpaid Principal Balance	699	199
Related Allowance	0	0
Average Recorded Investment	195	69
New York and other states [Member] | Real estate mortgage - 1 to 4 family [Member] | Home equity lines of credit [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	1,581	0
Unpaid Principal Balance	1,740	75
Related Allowance	0	0
Average Recorded Investment	238	0
Florida [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	4,065	5,705
Unpaid Principal Balance	6,983	10,343
Related Allowance	0	0
Average Recorded Investment	7,792	6,998
Florida [Member] | Commercial [Member] | Commercial real estate [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	2,698	5,000
Unpaid Principal Balance	3,890	9,042
Related Allowance	0	0
Average Recorded Investment	6,929	6,774
Florida [Member] | Commercial [Member] | Other [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	0	0
Unpaid Principal Balance	6	0
Related Allowance	0	0
Average Recorded Investment	0	0
Florida [Member] | Real estate mortgage - 1 to 4 family [Member] | First mortgages [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	1,318	705
Unpaid Principal Balance	2,886	1,301
Related Allowance	0	0
Average Recorded Investment	847	224
Florida [Member] | Real estate mortgage - 1 to 4 family [Member] | Home equity lines of credit [Member]
Impaired loans by loans class [Abstract]
Recorded Investment	49
Unpaid Principal Balance	201
Related Allowance	0
Average Recorded Investment	$ 16