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Note 11 - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments as Well as Assumptions Used in Estimating Fair Value (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Cash and Due from Banks [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets $ 51,417,000 $ 42,363,000
Cash and Due from Banks [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets
Cash and Due from Banks [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets
Cash and Due from Banks [Member]    
Carrying Amount, Assets $ 51,417,000 $ 42,363,000
Fair Value, Assets $ 51,417,000 $ 42,363,000
Securities Held to Maturity [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets
Securities Held to Maturity [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets
Securities Held to Maturity [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets $ 7,885,000 $ 6,180,000
Securities Held to Maturity [Member]    
Carrying Amount, Assets 7,885,000 6,180,000
Fair Value, Assets $ 7,885,000 $ 6,180,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets $ 668,412,000 $ 668,740,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets
Collateralized Mortgage Backed Securities [Member]    
Carrying Amount, Assets $ 668,412,000 $ 668,740,000
Fair Value, Assets $ 668,412,000 $ 668,740,000
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets $ 365,701,000 $ 317,445,000
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets 7,150,000 7,212,000
Other Securities [Member]    
Carrying Amount, Assets 372,851,000 324,657,000
Fair Value, Assets $ 372,851,000 $ 324,657,000
Loans Balance Sheet Location [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets
Loans Balance Sheet Location [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets
Loans Balance Sheet Location [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets $ 4,501,190,000 $ 4,434,079,000
Loans Balance Sheet Location [Member]    
Carrying Amount, Assets 4,458,541,000 4,387,979,000
Fair Value, Assets $ 4,501,190,000 $ 4,434,079,000
FHLB-NY Stock [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets
FHLB-NY Stock [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets $ 53,368,000 $ 56,066,000
FHLB-NY Stock [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets
FHLB-NY Stock [Member]    
Carrying Amount, Assets $ 53,368,000 $ 56,066,000
Fair Value, Assets 53,368,000 56,066,000
Total Assets, Financial Instruments [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets 51,417,000 42,363,000
Total Assets, Financial Instruments [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets 1,087,481,000 1,042,299,000
Total Assets, Financial Instruments [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets 4,516,225,000 4,447,471,000
Total Assets, Financial Instruments [Member]    
Carrying Amount, Assets 5,612,474,000 5,486,033,000
Fair Value, Assets 5,655,123,000 $ 5,532,133,000
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets  
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets   $ 48,000
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets  
Interest Rate Swaps [Member]    
Carrying Amount, Assets   $ 48,000
Fair Value, Assets   48,000
Fair Value, Inputs, Level 1 [Member] | Deposits [Member]    
Fair Value, Liabilities $ 2,701,825,000 $ 2,489,245,000
Fair Value, Inputs, Level 1 [Member] | Borrowings [Member]    
Fair Value, Liabilities
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps [Member]    
Fair Value, Liabilities
Fair Value, Inputs, Level 1 [Member] | Total Liabilities, Financial Instruments [Member]    
Fair Value, Liabilities $ 2,701,825,000 $ 2,489,245,000
Fair Value, Inputs, Level 2 [Member] | Deposits [Member]    
Fair Value, Liabilities 1,380,824,000 1,413,643,000
Fair Value, Inputs, Level 2 [Member] | Borrowings [Member]    
Fair Value, Liabilities 1,178,260,000 1,250,928,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]    
Fair Value, Liabilities 11,466,000 4,314,000
Fair Value, Inputs, Level 2 [Member] | Total Liabilities, Financial Instruments [Member]    
Fair Value, Liabilities $ 2,570,550,000 $ 2,668,885,000
Fair Value, Inputs, Level 3 [Member] | Deposits [Member]    
Fair Value, Liabilities
Fair Value, Inputs, Level 3 [Member] | Borrowings [Member]    
Fair Value, Liabilities $ 27,977,000 $ 29,018,000
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps [Member]    
Fair Value, Liabilities
Fair Value, Inputs, Level 3 [Member] | Total Liabilities, Financial Instruments [Member]    
Fair Value, Liabilities $ 27,977,000 $ 29,018,000
Deposits [Member]    
Carrying Amount, Liabilities 4,063,887,000 3,892,547,000
Fair Value, Liabilities 4,082,649,000 3,902,888,000
Borrowings [Member]    
Carrying Amount, Liabilities 1,190,789,000 1,271,676,000
Fair Value, Liabilities 1,206,237,000 1,279,946,000
Interest Rate Swaps [Member]    
Carrying Amount, Liabilities 11,466,000 4,314,000
Fair Value, Liabilities 11,466,000 4,314,000
Total Liabilities, Financial Instruments [Member]    
Carrying Amount, Liabilities 5,266,142,000 5,168,537,000
Fair Value, Liabilities 5,300,352,000 5,187,148,000
Carrying Amount, Assets 5,813,067,000 5,704,634,000
Carrying Amount, Liabilities $ 5,325,288,000 $ 5,231,567,000