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Note 10 - Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Fair Value, Option, Quantitative Disclosures [Table Text Block]
    Fair Value   Fair Value   Changes in Fair Values For Items Measured at Fair Value
    Measurements   Measurements   Pursuant to Election of the Fair Value Option
    at June 30,   at December 31,   Three Months Ended   Six Months Ended
(Dollars in thousands)   2017   2016   June 30, 2017   June 30, 2016   June 30, 2017   June 30, 2016
                         
Mortgage-backed securities   $
1,801
    $
2,016
    $
(3
)   $
(3
)   $
(10
)   $
2
 
Other securities    
28,706
     
28,429
     
112
     
90
     
144
     
186
 
Junior subordinated debentures    
35,137
     
33,959
     
(595
)    
492
     
(1,165
)    
1,546
 
Net gain (loss) from fair value adjustments
(1) (2)
   
 
     
 
    $
(486
)   $
579
    $
(1,031
)   $
1,734
 
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Quoted Prices                        
    in Active Markets   Significant Other   Significant Other        
    for Identical Assets   Observable Inputs   Unobservable Inputs   Total carried at fair value
    (Level 1)   (Level 2)   (Level 3)   on a recurring basis
    2017   2016   2017   2016   2017   2016   2017   2016
    (In thousands)
                                 
Assets:                                                                
Mortgage-backed Securities   $
-
    $
-
    $
520,012
    $
516,476
    $
-
    $
-
    $
520,012
    $
516,476
 
Other securities    
-
     
-
     
310,249
     
337,544
     
7,444
     
7,361
     
317,693
     
344,905
 
Interest rate swaps    
-
     
-
     
5,648
     
6,350
     
-
     
-
     
5,648
     
6,350
 
                                                                 
Total assets   $
-
    $
-
    $
835,909
    $
860,370
    $
7,444
    $
7,361
    $
843,353
    $
867,731
 
                                                                 
Liabilities:                                                                
Junior subordinated debentures   $
-
    $
-
    $
-
    $
-
    $
35,137
    $
33,959
    $
35,137
    $
33,959
 
Interest rate swaps    
-
     
-
     
4,624
     
3,386
     
-
     
-
     
4,624
     
3,386
 
                                                                 
Total liabilities   $
-
    $
-
    $
4,624
    $
3,386
    $
35,137
    $
33,959
    $
39,761
    $
37,345
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
    For the three months ended
    June 30, 2017   June 30, 2016
    Trust preferred   Junior subordinated   Trust preferred   Junior subordinated
    securities   debentures   securities   debentures
    (In thousands)
                 
Beginning balance   $
7,394
    $
34,536
    $
7,150
    $
27,977
 
Net gain from fair value adjustment of financial assets
(1)
   
48
     
-
     
15
     
-
 
Net loss (gain) from fair value adjustment of financial liabilities
(1)
   
-
     
594
     
-
     
(491
)
Decrease in accrued interest payable    
-
     
7
     
-
     
(1
)
Change in unrealized gains included in other comprehensive income    
2
     
-
     
2
     
-
 
Ending balance   $
7,444
    $
35,137
    $
7,167
    $
27,485
 
                                 
Changes in unrealized gains held at period end   $
2
    $
-
    $
2
    $
-
 
    For the six months ended
    June 30, 2017   June 30, 2016
    Trust preferred   Junior subordinated   Trust preferred   Junior subordinated
    securities   debentures   securities   debentures
    (In thousands)
                 
Beginning balance   $
7,361
    $
33,959
    $
7,212
    $
29,018
 
Net gain (loss) from fair value adjustment of financial assets
(1)
   
81
     
-
     
(45
)    
-
 
Net loss (gain) from fair value adjustment of financial liabilities
(1)
   
-
     
1,165
     
-
     
(1,547
)
Increase in accrued interest payable    
-
     
13
     
-
     
14
 
Change in unrealized gains included in other comprehensive income    
2
     
-
     
-
     
-
 
Ending balance   $
7,444
    $
35,137
    $
7,167
    $
27,485
 
                                 
Changes in unrealized gains held at period end   $
2
    $
-
    $
-
    $
-
 
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
    June 30, 2017
                     
    Fair Value   Valuation Technique   Unobservable Input   Range   Weighted Average
    (Dollars in thousands)    
Assets:                    
                     
Trust preferred securities   $
7,444
     
Discounted cash flows
     
Discount rate
   
6.0%
-
6.9%
   
6.8
%
                                         
Liabilities:                                        
                                         
Junior subordinated debentures   $
35,137
     
Discounted cash flows
     
Discount rate
   
 
6.0%
   
6.0
%
    December 31, 2016
                     
    Fair Value   Valuation Technique   Unobservable Input   Range   Weighted Average
    (Dollars in thousands)    
Assets:                    
                     
Trust preferred securities   $
7,361
     
Discounted cash flows
     
Discount rate
   
6.3%
-
7.1%
   
7.0
%
                                         
Liabilities:                                        
                                         
Junior subordinated debentures   $
33,959
     
Discounted cash flows
     
Discount rate
   
 
6.3%
   
6.3
%
Fair Value Measurements, Nonrecurring [Table Text Block]
    Quoted Prices                        
    in Active Markets   Significant Other   Significant Other        
    for Identical Assets   Observable Inputs   Unobservable Inputs   Total carried at fair value
    (Level 1)   (Level 2)   (Level 3)   on a recurring basis
    2017   2016   2017   2016   2017   2016   2017   2016
    (In thousands)
Assets:                                
Impaired loans   $
-
    $
-
    $
-
    $
-
    $
14,418
    $
14,968
    $
14,418
    $
14,968
 
Other real estate owned    
-
     
-
     
-
     
-
     
-
     
533
     
-
     
533
 
                                                                 
Total assets   $
-
    $
-
    $
-
    $
-
    $
14,418
    $
15,501
    $
14,418
    $
15,501
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
    June 30, 2017
    Carrying   Fair            
    Amount   Value   Level 1   Level 2   Level 3
    (In thousands)
Assets:                    
                     
Cash and due from banks   $
48,539
     
48,539
    $
48,539
    $
-
    $
-
 
Securities held-to-maturity                                        
Mortgage-backed securities    
7,983
     
7,816
     
-
     
7,816
     
-
 
Other securities    
24,451
     
22,777
     
-
     
-
     
22,777
 
Securities available for sale                                        
Mortgage-backed securities    
520,012
     
520,012
     
-
     
520,012
     
-
 
Other securities    
317,693
     
317,693
     
-
     
310,249
     
7,444
 
Loans held for sale    
30,565
     
30,565
     
 
     
 
     
30,565
 
Loans    
5,045,680
     
5,021,555
     
-
     
-
     
5,021,555
 
FHLB-NY stock    
66,630
     
66,630
     
-
     
66,630
     
-
 
Accrued interest receivable    
21,439
     
21,439
     
-
     
21,439
     
-
 
Interest rate swaps    
5,648
     
5,648
     
-
     
5,648
     
-
 
                                         
Total assets   $
6,088,640
    $
6,062,674
    $
48,539
    $
931,794
    $
5,082,341
 
                                         
                                         
Liabilities:                                        
Deposits   $
4,254,803
    $
4,256,788
    $
2,922,426
    $
1,334,362
    $
-
 
Borrowings    
1,425,779
     
1,422,040
     
-
     
1,386,903
     
35,137
 
Accrued interest payable    
2,587
     
2,587
     
-
     
2,587
     
-
 
Interest rate swaps    
4,624
     
4,624
     
-
     
4,624
     
-
 
                                         
Total liabilities   $
5,687,793
    $
5,686,039
    $
2,922,426
    $
2,728,476
    $
35,137
 
    December 31, 2016
    Carrying   Fair            
    Amount   Value   Level 1   Level 2   Level 3
    (In thousands)
Assets:                                        
                                         
Cash and due from banks   $
35,857
    $
35,857
    $
35,857
    $
-
    $
-
 
Securities held-to-maturity                                        
Other securities    
37,735
     
35,408
     
-
     
-
     
35,408
 
Securities available for sale                                        
Mortgage-backed securities    
516,476
     
516,476
     
-
     
516,476
     
-
 
Other securities    
344,905
     
344,905
     
-
     
337,544
     
7,361
 
Loans    
4,835,693
     
4,814,840
     
-
     
-
     
4,814,840
 
FHLB-NY stock    
59,173
     
59,173
     
-
     
59,173
     
-
 
Interest rate swaps    
6,350
     
6,350
     
-
     
6,350
     
-
 
                                         
Total assets   $
5,836,189
    $
5,813,009
    $
35,857
    $
919,543
    $
4,857,609
 
                                         
Liabilities:                                        
Deposits   $
4,205,631
    $
4,213,714
    $
2,833,516
    $
1,380,198
    $
-
 
Borrowings    
1,266,563
     
1,255,283
     
-
     
1,221,324
     
33,959
 
Interest rate swaps    
3,386
     
3,386
     
-
     
3,386
     
-
 
                                         
Total liabilities   $
5,475,580
    $
5,472,383
    $
2,833,516
    $
2,604,908
    $
33,959
 
Fair Value, Measurements, Nonrecurring [Member]  
Notes Tables  
Fair Value Measurements, Nonrecurring [Table Text Block]
    At June 30, 2017
    Fair Value   Valuation Technique   Unobservable Input   Range   Weighted Average
    (Dollars in thousands)
Assets:                    
                     
Impaired loans   $
1,773
   
Income approach
 
Capitalization rate
 
6.0%
to
7.5%
 
6.8%
     
 
   
 
 
Reduction for planned expedited disposal
 
 
15.0%
 
15.0%
                             
Impaired loans   $
7,674
   
Sales approach
 
Adjustment to sales comparison value to reconcile differences between comparable sales
 
-40.0%
to
16.2%
 
-2.0%
     
 
   
 
 
Reduction for planned expedited disposal
 
0%
to
15.0%
 
7.7%
                             
Impaired loans   $
4,971
   
Blended income and sales approach
 
Adjustment to sales comparison value to reconcile differences between comparable sales
 
-30.0%
to
25.0%
 
-1.6%
     
 
   
 
 
Capitalization rate
 
5.0%
to
9.8%
 
7.4%
     
 
   
 
 
Reduction planned for expedited disposal
 
14.5%
to
15.0%
 
15.0%
    At December 31, 2016
    Fair Value   Valuation Technique   Unobservable Input   Range   Weighted Average
    (Dollars in thousands)
Assets:                            
                             
Impaired loans   $
2,007
   
Income approach
 
Capitalization rate
 
6.0%
to
7.5%
 
7.0%
     
 
   
 
 
Reduction for planned expedited disposal
 
 
15.0%
 
15.0%
                             
Impaired loans   $
8,703
   
Sales approach
 
Adjustment to sales comparison value to reconcile differences between comparable sales
 
-40.0%
to
16.2%
 
-1.5%
     
 
   
 
 
Reduction for planned expedited disposal
 
0%
to
15.0%
 
7.7%
                             
Impaired loans   $
4,258
   
Blended income and sales approach
 
Adjustment to sales comparison value to reconcile differences between comparable sales
 
-50.0%
to
25.0%
 
-0.6%
     
 
   
 
 
Capitalization rate
 
5.3%
to
9.5%
 
7.2%
     
 
   
 
 
Reduction planned for expedited disposal
 
 
15.0%
 
15.0%
                             
Other real estate owned   $
533
   
Sales approach
 
Adjustment to sales comparison value to reconcile differences between comparable sales
 
3.3%
to
18.6%
 
11.0%