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Note 18 - Fair Value of Financial Instruments (Details) - Carrying Amounts and Estimated Fair Values of Selected Financial Instruments as Well as Assumptions Used in Estimating Fair Value - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets:    
Carrying Amount, Assets $ 5,704,634 $ 5,077,013
Liabilities:    
Carrying Amount, Liabilities 5,231,567 4,620,766
Cash and Due From Banks [Member]    
Assets:    
Carrying Amount, Assets 42,363 34,265
Fair Value, Assets 42,363 34,265
Securities Held to Maturity [Member]    
Assets:    
Carrying Amount, Assets 6,180  
Fair Value, Assets 6,180  
Collateralized Mortgage Backed Securities [Member]    
Assets:    
Carrying Amount, Assets 668,740 704,933
Fair Value, Assets 668,740 704,933
Other Securities [Member]    
Assets:    
Carrying Amount, Assets 324,657 268,377
Fair Value, Assets 324,657 268,377
Loans [Member]    
Assets:    
Carrying Amount, Assets 4,387,979 3,810,373
Fair Value, Assets 4,434,079 3,871,087
FHLB - NY Stock [Member]    
Assets:    
Carrying Amount, Assets 56,066 46,924
Fair Value, Assets 56,066 46,924
Interest Rate Swaps [Member]    
Assets:    
Carrying Amount, Assets 48 84
Fair Value, Assets 48 84
Total Assets - Financial Instruments [Member]    
Assets:    
Carrying Amount, Assets 5,486,033 4,864,956
Fair Value, Assets 5,532,133 4,925,670
Borrowings [Member]    
Liabilities:    
Carrying Amount, Liabilities 1,271,676 1,056,492
Fair Value, Liabilities 1,279,946 1,070,428
Interest Rate Swaps [Member]    
Liabilities:    
Carrying Amount, Liabilities 4,314 2,649
Fair Value, Liabilities 4,314 2,649
Total Liabilities - Financial Instruments [Member]    
Liabilities:    
Carrying Amount, Liabilities 5,168,537 4,567,739
Fair Value, Liabilities 5,187,148 4,597,200
Deposits [Member]    
Liabilities:    
Carrying Amount, Liabilities 3,892,547 3,508,598
Fair Value, Liabilities 3,902,888 3,524,123
Fair Value, Inputs, Level 1 [Member] | Cash and Due From Banks [Member]    
Assets:    
Fair Value, Assets 42,363 34,265
Fair Value, Inputs, Level 1 [Member] | Total Assets - Financial Instruments [Member]    
Assets:    
Fair Value, Assets 42,363 34,265
Fair Value, Inputs, Level 1 [Member] | Total Liabilities - Financial Instruments [Member]    
Liabilities:    
Fair Value, Liabilities 2,489,245 2,202,775
Fair Value, Inputs, Level 1 [Member] | Deposits [Member]    
Liabilities:    
Fair Value, Liabilities 2,489,245 2,202,775
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]    
Assets:    
Fair Value, Assets 668,740 704,933
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]    
Assets:    
Fair Value, Assets 317,445 245,768
Fair Value, Inputs, Level 2 [Member] | FHLB - NY Stock [Member]    
Assets:    
Fair Value, Assets 56,066 46,924
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]    
Assets:    
Fair Value, Assets 48 84
Fair Value, Inputs, Level 2 [Member] | Total Assets - Financial Instruments [Member]    
Assets:    
Fair Value, Assets 1,042,299 997,709
Fair Value, Inputs, Level 2 [Member] | Borrowings [Member]    
Liabilities:    
Fair Value, Liabilities 1,250,928 1,041,657
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]    
Liabilities:    
Fair Value, Liabilities 4,314 2,649
Fair Value, Inputs, Level 2 [Member] | Total Liabilities - Financial Instruments [Member]    
Liabilities:    
Fair Value, Liabilities 2,668,885 2,365,654
Fair Value, Inputs, Level 2 [Member] | Deposits [Member]    
Liabilities:    
Fair Value, Liabilities 1,413,643 1,321,348
Fair Value, Inputs, Level 3 [Member] | Securities Held to Maturity [Member]    
Assets:    
Fair Value, Assets 6,180  
Fair Value, Inputs, Level 3 [Member] | Other Securities [Member]    
Assets:    
Fair Value, Assets 7,212 22,609
Fair Value, Inputs, Level 3 [Member] | Loans [Member]    
Assets:    
Fair Value, Assets 4,434,079 3,871,087
Fair Value, Inputs, Level 3 [Member] | Total Assets - Financial Instruments [Member]    
Assets:    
Fair Value, Assets 4,447,471 3,893,696
Fair Value, Inputs, Level 3 [Member] | Borrowings [Member]    
Liabilities:    
Fair Value, Liabilities 29,018 28,771
Fair Value, Inputs, Level 3 [Member] | Total Liabilities - Financial Instruments [Member]    
Liabilities:    
Fair Value, Liabilities $ 29,018 $ 28,771