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Note 7 - Loans (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
March 31, 2017
    
December 31, 2016
  
   
(In thousands)
  
Commercial loans
   $
2,152,269
     $
2,248,187
  
Residential mortgage loans
    
2,584,477
      
2,444,048
  
Commercial mortgage loans
    
5,906,084
      
5,785,248
  
Real estate construction loans
    
554,218
      
548,088
  
Equity lines
    
163,877
      
171,711
  
Installment & other loans
    
4,584
      
3,993
  
Gross loans
   $
11,365,509
     $
11,201,275
  
Allowance for loan losses
    
(115,544
 )    
(118,966
 )
Unamortized deferred loan fees
    
(4,395
 )    
(4,994
 )
Total loans, net
   $
11,245,570
     $
11,077,315
  
Loans held for sale
   $
5,835
     $
7,500
  
Impaired Financing Receivables [Table Text Block]
   
Impaired Loans
  
   
Average Recorded Investment
   
Interest Income Recognized
 
   
Three months ended
    
Three months ended
  
   
March 31,
    
March 31,
  
   
2017
    
2016
    
2017
    
2016
  
   
(In thousands)
  
Commercial loans
   $
23,335
     $
12,670
     $
83
     $
120
  
Real estate construction loans
    
16,930
      
20,292
      
340
      
65
  
Commercial mortgage loans
    
61,405
      
87,452
      
445
      
890
  
Residential mortgage loans and equity lines
    
16,543
      
16,991
      
132
      
132
  
Total impaired loans
   $
118,213
     $
137,405
     $
1,000
     $
1,207
  
Schedule Of Impaired Loans And Related Allowance And Charge Off [Table Text Block]
   
Impaired Loans
  
   
March 31, 2017
    
December 31, 2016
  
   
Unpaid Principal
Balance
    
Recorded
Investment
   
Allowance
   
Unpaid Principal
Balance
    
Recorded
Investment
   
Allowance
 
   
(In thousands)
  
                                                 
With no allocated allowance
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
19,836
     $
17,973
     $
-
     $
24,037
     $
23,121
     $
-
  
Real estate construction loans
    
5,776
      
33,044
      
-
      
5,776
      
5,458
      
-
  
Commercial mortgage loans
    
49,567
      
43,458
      
-
      
60,522
      
54,453
      
-
  
Residential mortgage loans and equity lines
    
4,261
      
4,261
      
-
      
5,472
      
5,310
      
-
  
Subtotal
   $
79,440
     $
98,736
     $
-
     $
95,807
     $
88,342
     $
-
  
With allocated allowance
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
2,410
     $
1,979
     $
1,062
     $
5,216
     $
4,640
     $
1,827
  
Commercial mortgage loans
    
16,282
      
15,814
      
818
      
10,158
      
10,017
      
573
  
Residential mortgage loans and equity lines
    
13,113
      
11,847
      
395
      
13,263
      
12,075
      
396
  
Subtotal
   $
31,805
     $
29,640
     $
2,275
     $
28,637
     $
26,732
     $
2,796
  
Total impaired loans
   $
111,245
     $
128,376
     $
2,275
     $
124,444
     $
115,074
     $
2,796
  
Past Due Financing Receivables [Table Text Block]
   
March 31, 2017
  
   
30-59 Days
Past Due
    
60-89 Day
s
Past Due
    
90 Days or
More Past
Due
    
Non-accrual
Loans
    
Total Past Due
    
Loans Not
Past Due
    
Total
  
   
(In thousands)
  
Type of Loans:
                                                        
Commercial loans
   $
27,682
     $
315
     $
-
     $
13,865
     $
41,862
     $
2,110,407
     $
2,152,269
  
Real estate construction loans
    
3,045
      
-
      
-
      
5,361
      
8,406
      
545,812
      
554,218
  
Commercial mortgage loans
    
30,852
      
13,852
      
-
      
21,117
      
65,821
      
5,840,263
      
5,906,084
  
Residential mortgage loans and equity lines
    
4,067
      
-
      
-
      
7,613
      
11,680
      
2,736,674
      
2,748,354
  
Installment and other loans
    
-
      
-
      
-
      
-
      
-
      
4,584
      
4,584
  
Total loans
   $
65,646
     $
14,167
     $
-
     $
47,956
     $
127,769
     $
11,237,740
     $
11,365,509
  
   
December 31, 2016
  
   
30-59 Days
Past Due
    
60-89 Days
Past Due
    
90 Days or
More Past
Due
    
Non-accrual
Loans
    
Total Past Due
    
Loans Not
Past Due
    
Total
  
   
(In thousands)
  
Type of Loans:
                                                        
Commercial loans
   $
22,753
     $
27,190
     $
-
     $
15,710
     $
65,653
     $
2,182,534
     $
2,248,187
  
Real estate construction loans
    
10,390
      
5,835
      
-
      
5,458
      
21,683
      
526,405
      
548,088
  
Commercial mortgage loans
    
5,886
      
700
      
-
      
20,078
      
26,664
      
5,758,584
      
5,785,248
  
Residential mortgage loans and equity lines
    
4,390
      
-
      
-
      
8,436
      
12,826
      
2,602,933
      
2,615,759
  
Installment and other loans
    
-
      
-
      
-
      
-
      
-
      
3,993
      
3,993
  
Total loans
   $
43,419
     $
33,725
     $
-
     $
49,682
     $
126,826
     $
11,074,449
     $
11,201,275
  
Schedule Of Troubled Debt Restructurings [Table Text Block]
   
Three months ended March 31, 2017
    
March 31, 2017
  
   
No. of Contracts
    
Pre-Modification
Outstanding Recorded Investment
   
Post-Modification Outstanding Recorded Investment
   
Charge-offs
   
Specific Reserve
 
   
(Dollars in thousands)
  
Real estate construction loans
    
2
     $
27,683
     $
27,683
     $
-
     $
-
  
Total
    
2
     $
27,683
     $
27,683
     $
-
     $
-
  
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
   
March 31, 2017
  
Accruing TDRs
  
Payment
Deferral
    
Rate
Reduction
    
Rate Reduction
and Payment
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
5,752
     $
-
     $
335
     $
6,087
  
Real estate construction loans
    
27,683
      
-
      
-
      
27,683
  
Commercial mortgage loans
    
25,806
      
5,939
      
6,410
      
38,155
  
Residential mortgage loans
    
5,036
      
596
      
2,862
      
8,494
  
Total accruing TDRs
   $
64,277
     $
6,535
     $
9,607
     $
80,419
  
   
December 31, 2016
  
Accruing TDRs
  
Payment
Deferral
    
Rate
Reduction
    
Rate Reduction
and Payment
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
7,971
     $
-
     $
4,081
     $
12,052
  
Commercial mortgage loans
    
25,979
      
5,961
      
12,452
      
44,392
  
Residential mortgage loans
    
5,104
      
789
      
3,056
      
8,949
  
Total accruing TDRs
   $
39,054
     $
6,750
     $
19,589
     $
65,393
  
Non Accrual Troubled Debt Restructurings [Table Text Block]
   
March 31, 2017
  
Non-accrual TDRs
  
Payment
Deferral
    
Rate
Reduction
    
Rate Reduction
and Payment
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
13,560
     $
-
     $
-
     $
13,560
  
Commercial mortgage loans
    
2,206
      
1,765
      
14,952
      
18,923
  
Residential mortgage loans
    
132
      
-
      
164
      
296
  
Total non-accrual TDRs
   $
15,898
     $
1,765
     $
15,116
     $
32,779
  
   
December 31, 2016
  
Non-accrual TDRs
  
Payment
Deferral
    
Rate
Reduction
    
Rate Reduction
and Paymen
t
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
14,565
     $
-
     $
-
     $
14,565
  
Commercial mortgage loans
    
2,510
      
1,795
      
10,328
      
14,633
  
Residential mortgage loans
    
356
      
-
      
168
      
524
  
Total non-accrual TDRs
   $
17,431
     $
1,795
     $
10,496
     $
29,722
  
Activity Within The Troubled Debt Resturings [Table Text Block]
   
Three months ended March 31,
  
Accruing TDRs
  
2017
    
2016
  
   
(In thousands)
  
Beginning balance
   $
65,393
     $
81,680
  
New restructurings
    
27,683
      
-
  
Restructured loans restored to accrual status
    
-
      
10,303
  
Payments
    
(4,595
 )    
(1,811
 )
Restructured loans placed on non-accrual status
    
(5,822
 )    
-
  
Expiration of loan concession upon renewal
    
(2,240
 )    
-
  
Ending balance
   $
80,419
     $
90,172
  
   
Three months ended March 31,
   		  
Non-accrual TDRs
 
2017
    
2016
  
       
(In thousands)
  
Beginning balance
   $
29,722
     $
39,923
  
New restructurings
    
-
      
-
  
Restructured loans placed on non-accrual status
    
5,822
      
-
  
Charge-offs
    
(1,049
 )    
-
  
Payments
    
(990
 )    
(6,411
 )
Foreclosures
    
(726
 )    
-
  
Restructured loans restored to accrual status
    
-
      
(10,303
 )
Ending balance
   $
32,779
     $
23,209
  
Financing Receivable Credit Quality Indicators [Table Text Block]
   
March 31, 2017
  
   
Pass/Watch
   
Special Mention
   
Substandard
   
Doubtful
   
Total
 
   
(In thousands)
  
Commercial loans   $
1,975,243
     $
112,157
     $
64,794
     $
75
     $
2,152,269
  
Real estate construction loans    
466,878
      
45,466
      
41,874
      
-
      
554,218
  
Commercial mortgage loans    
5,531,743
      
260,717
      
113,624
      
-
      
5,906,084
  
Residential mortgage loans and equity lines    
2,738,792
      
269
      
9,293
      
-
      
2,748,354
  
Installment and other loans    
4,584
      
-
      
-
      
-
      
4,584
  
Total gross loans
   $
10,717,240
     $
418,609
     $
229,585
     $
75
     $
11,365,509
  
                                         
Loans held for sale
   $
-
     $
-
     $
5,835
     $
-
     $
5,835
  
   
December 31, 2016
  
   
Pass/Watch
   
Special Mention
   
Substandard
   
Doubtful
   
Total
 
   
(In thousands)
  
Commercial loans   $
2,023,114
     $
140,682
     $
84,293
     $
98
     $
2,248,187
  
Real estate construction loans    
469,909
      
44,129
      
34,050
      
-
      
548,088
  
Commercial mortgage loans    
5,410,623
      
250,221
      
124,404
      
-
      
5,785,248
  
Residential mortgage loans and equity lines    
2,605,834
      
-
      
9,925
      
-
      
2,615,759
  
Installment and other loans    
3,993
      
-
      
-
      
-
      
3,993
  
Total gross loans
   $
10,513,473
     $
435,032
     $
252,672
     $
98
     $
11,201,275
  
                                         
Loans held for sale
   $
-
     $
-
     $
7,500
     $
-
     $
7,500
  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
 
 
 
  
Real Estate
    
Commercial
    
Residential
    
Installment
   
 
 
 
   
Commercial
    
Construction
    
Mortgage
    
Mortgage Loans
    
and Other
    
 
 
 
   
Loans
    
Loans
    
Loans
    
and Equity Lines
    
Loans
    
Total
  
   
(In thousands)
  
                                                 
2017 Beginning Balance
   $
49,203
     $
23,268
     $
34,864
     $
11,620
     $
11
     $
118,966
  
Provision/(credit) for possible credit losses
    
(1,214
 )    
(3,549
 )    
1,362
      
898
      
3
      
(2,500
 )
Charge-offs
    
(1,204
 )    
-
      
(555
 )    
-
      
-
      
(1,759
 )
Recoveries
    
491
      
49
      
289
      
8
      
-
      
837
  
Net (charge-offs)/recoveries
    
(713
 )    
49
      
(266
 )    
8
      
-
      
(922
 )
                                                 
March 31, 2017 Ending Balance
   $
47,276
     $
19,768
     $
35,960
     $
12,526
     $
14
     $
115,544
  
Reserve for impaired loans
   $
1,062
     $
-
     $
818
     $
395
     $
-
     $
2,275
  
Reserve for non-impaired loans
   $
46,214
     $
19,768
     $
35,142
     $
12,131
     $
14
     $
113,269
  
Reserve for off-balance sheet credit commitments
   $
2,243
     $
909
     $
120
     $
146
     $
6
     $
3,424
  
                                                 
2016 Beginning Balance
   $
56,199
     $
22,170
     $
49,440
     $
11,145
     $
9
     $
138,963
  
Provision/(credit) for possible credit losses
    
1,265
      
(16,702
 )    
978
      
3,961
      
(2
 )    
(10,500
 )
Charge-offs
    
(2,070
 )    
-
      
(110
 )    
(149
 )    
-
      
(2,329
 )
Recoveries
    
987
      
7,276
      
143
      
12
      
-
      
8,418
  
Net (charge-offs)/recoveries
    
(1,083
 )    
7,276
      
33
      
(137
 )    
-
      
6,089
  
                                                 
March 31, 2016 Ending Balance
   $
56,381
     $
12,744
     $
50,451
     $
14,969
     $
7
     $
134,552
  
Reserve for impaired loans
   $
225
     $
-
     $
6,593
     $
372
     $
-
     $
7,190
  
Reserve for non-impaired loans
   $
56,156
     $
12,744
     $
43,858
     $
14,597
     $
7
     $
127,362
  
Reserve for off-balance sheet credit commitments
   $
2,641
     $
-
     $
53
     $
-
     $
-
     $
2,694
  
Impairment Method [Member]  
Notes Tables  
Impaired Financing Receivables [Table Text Block]
   
Commercial
Loans
    
Real Estate
Construction
Loans
    
Commercial
Mortgage
Loans
    
Residential
Mortgage Loans
and Equity Lines
    
Installment and
Other Loans
    
Total
  
   
(In thousands)
  
March 31, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Loans individually evaluated for impairment
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
1,062
     $
-
     $
818
     $
395
     $
-
     $
2,275
  
Balance
   $
19,951
     $
33,044
     $
59,272
     $
16,108
     $
-
     $
128,375
  
                                                 
Loans collectively evaluated for impairment
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
46,214
     $
19,768
     $
35,142
     $
12,131
     $
14
     $
113,269
  
Balance
   $
2,132,318
     $
521,174
     $
5,846,812
     $
2,732,246
     $
4,584
     $
11,237,134
  
                                                 
Total allowance
   $
47,276
     $
19,768
     $
35,960
     $
12,526
     $
14
     $
115,544
  
Total balance
   $
2,152,269
     $
554,218
     $
5,906,084
     $
2,748,354
     $
4,584
     $
11,365,509
  
                                                 
December 31, 2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Loans individually evaluated for impairment
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
1,827
     $
-
     $
573
     $
396
     $
-
     $
2,796
  
Balance
   $
27,761
     $
5,458
     $
64,470
     $
17,385
     $
-
     $
115,074
  
                                                 
                                                 
Loans collectively evaluated for impairment
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
47,376
     $
23,268
     $
34,291
     $
11,224
     $
11
     $
116,170
  
Balance
   $
2,220,426
     $
542,630
     $
5,720,778
     $
2,598,374
     $
3,993
     $
11,086,201
  
                                                 
Total allowance
   $
49,203
     $
23,268
     $
34,864
     $
11,620
     $
11
     $
118,966
  
Total balance
   $
2,248,187
     $
548,088
     $
5,785,248
     $
2,615,759
     $
3,993
     $
11,201,275