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Note 5 - Loans (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
201
7
    
201
6
  
   
(In thousands
)
  
Type of Loans
:
  
 
 
 
  
 
 
 
Commercial loans
   $
2,461,266
     $
2,248,187
  
Real estate construction loans
    
678,805
      
548,088
  
Commercial mortgage loans
    
6,482,695
      
5,785,248
  
Residential mortgage loans
    
3,062,050
      
2,444,048
  
Equity lines
    
180,304
      
171,711
  
Installment and other loans
    
5,170
      
3,993
  
Gross loans
    
12,870,290
      
11,201,275
  
Less
:
                
Allowance for loan losses
    
(123,279
 )    
(118,966
 )
Unamortized deferred loan fees
    
(3,245
 )    
(4,994
 )
Total loans and leases, net
   $
12,743,766
     $
11,077,315
  
Loans held for sale
   $
8,000
     $
7,500
  
Schedule of Related Party Transactions [Table Text Block]
   
December 31
,
  
   
201
7
    
201
6
  
   
(In thousands
)
  
Balance at beginning of year
   $
51,327
     $
91,620
  
Additional loans made
    
53,584
      
62,206
  
Payment received
    
(38,318
 )    
(102,499
 )
Balance at end of year
   $
66,593
     $
51,327
  
Schedule Of Impaired Loans And Related Allowance And Charge Off [Table Text Block]
   
Impaired Loan
s
  
   
As of December 31, 201
7
    
As of December 31, 201
6
  
   
Unpaid Principal Balanc
e
    
Recorded Investment
    
Allowance
    
Unpaid Principal Balanc
e
    
Recorded Investment
    
Allowance
  
   
(In thousands
)
  
                                                 
With no allocated allowanc
e
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
43,483
     $
42,702
     $
-
     $
24,037
     $
23,121
     $
-
  
Real estate construction loans
    
8,821
      
8,185
      
-
      
5,776
      
5,458
      
-
  
Commercial mortgage loans
    
37,825
      
31,029
      
-
      
60,522
      
54,453
      
-
  
Residential mortgage and equity lines
    
1,301
      
1,301
      
-
      
5,472
      
5,310
      
-
  
Subtotal
   $
91,430
     $
83,217
     $
-
     $
95,807
     $
88,342
     $
-
  
With allocated allowanc
e
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
891
     $
793
     $
43
     $
5,216
     $
4,640
     $
1,827
  
Commercial mortgage loans
    
21,733
      
21,635
      
1,738
      
10,158
      
10,017
      
573
  
Residential mortgage and equity lines
    
13,022
      
11,708
      
353
      
13,263
      
12,075
      
396
  
Subtotal
   $
35,646
     $
34,136
     $
2,134
     $
28,637
     $
26,732
     $
2,796
  
Total impaired loans
   $
127,076
     $
117,353
     $
2,134
     $
124,444
     $
115,074
     $
2,796
  
Impaired Financing Receivables [Table Text Block]
   
For the year ended December 31
,
  
   
201
7
    
201
6
    
201
5
    
201
7
    
201
6
    
201
5
  
   
Average Recorded Investment
    
Interest Income Recognized
  
   
(In thousands
)
  
Commercial loans
   $
26,957
     $
21,199
     $
23,960
     $
1,303
     $
767
     $
546
  
Real estate construction loans
    
26,695
      
10,362
      
22,066
      
-
      
-
      
261
  
Commercial mortgage loans
    
58,635
      
81,905
      
100,118
      
1,618
      
2,214
      
2,708
  
Residential mortgage and equity lines
    
14,780
      
17,553
      
16,801
      
381
      
481
      
482
  
Subtotal
   $
127,067
     $
131,019
     $
162,945
     $
3,302
     $
3,462
     $
3,997
  
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]
   
201
7
    
201
6
    
201
5
  
   
(In thousands
)
  
Non-accrual portfolio loans
   $
48,787
     $
49,682
     $
52,130
  
Non-accrual loans held-for-sale
    
8,000
      
7,500
      
5,944
  
Total non-accrual loans
   $
56,787
     $
57,182
     $
58,074
  
                         
Contractual interest due
   $
3,254
     $
1,573
     $
5,732
  
Interest recognized
    
86
      
95
      
119
  
Net interest foregone
   $
3,168
     $
1,478
     $
5,613
  
Past Due Financing Receivables [Table Text Block]
   
As of December 31, 201
7
  
                                           
   
30-59 Days
Past Du
e
    
60-89 Days
Past Du
e
    
90 Days or
More Past
Du
e
    
Non-accrual
Loan
s
    
Total Past
Du
e
    
Loans Not Past
Du
e
    
Tota
l
  
Type of Loans
:
  
(In thousands
)
  
Commercial loans
   $
11,079
     $
5,192
     $
-
     $
14,296
     $
30,567
     $
2,430,699
     $
2,461,266
  
Real estate construction loans
    
3,028
      
-
      
-
      
8,185
      
11,213
      
667,592
      
678,805
  
Commercial mortgage loans
    
17,573
      
5,602
      
-
      
19,820
      
42,995
      
6,439,700
      
6,482,695
  
Residential mortgage loans
    
6,613
      
732
      
-
      
6,486
      
13,831
      
3,228,523
      
3,242,354
  
Installment and other loans
    
103
      
-
      
-
      
-
      
103
      
5,067
      
5,170
  
Total loans
   $
38,396
     $
11,526
     $
-
     $
48,787
     $
98,709
     $
12,771,581
     $
12,870,290
  
   
As of December 31, 201
6
  
                                           
   
30-59 Days
Past Du
e
    
60-89 Days
Past Du
e
    
90 Days or
More Past
Du
e
    
Non-accrual
Loan
s
    
Total Past
Du
e
    
Loans Not Past
Du
e
    
Tota
l
  
Type of Loans
:
  
(In thousands
)
  
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
    
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]
.  
No. of
Contract
s
    
Pre-Modification
Outstanding Recorded
Investment
    
Post-Modification
Outstanding Recorded
Investment
    
Specific Reserve
    
Charge-offs
  
   
(Dollars in thousands
)
  
                                         
Commercial loans
    
16
     $
29,590
     $
29,590
     $
7
     $
-
  
Real estate construction loans
    
2
      
27,683
      
27,683
      
-
      
-
  
Commercial mortgage loans
    
9
      
19,380
      
19,075
      
1,496
      
305
  
Residential mortgage and equity lines
    
4
      
1,088
      
1,088
      
53
      
-
  
Total
   
31
     $
77,741
     $
77,436
     $
1,556
     $
305
  
   
No. of
Contract
s
    
Pre-Modification
Outstanding Recorded
Investment
    
Post-Modification
Outstanding Recorded
Investment
    
Specific Reserve
    
Charge-offs
  
   
(Dollars in thousands
)
  
                                         
Commercial loans
    
24
     $
30,215
     $
29,385
     $
1,746
     $
830
  
Commercial mortgage loans
    
4
      
4,153
      
4,153
      
34
      
-
  
Residential mortgage and equity lines
    
2
      
367
      
367
      
-
      
-
  
Total
   
30
     $
34,735
     $
33,905
     $
1,780
     $
830
  
   
No. of
Contract
s
    
Pre-Modification
Outstanding Recorded
Investment
    
Post-Modification
Outstanding Recorded
Investment
    
Specific Reserve
    
Charge-off
  
   
(Dollars in thousands
)
  
                                         
Commercial loans
    
3
     $
1,181
     $
1,181
     $
2
     $
-
  
Commercial mortgage loans
    
20
      
17,204
      
17,204
      
708
      
-
  
Residential mortgage and equity lines
    
5
      
1,522
      
1,374
      
42
      
148
  
Total
   
28
     $
19,907
     $
19,759
     $
752
     $
148
  
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
   
December 31, 201
7
  
Accruing TDR
s
  
Payment
Deferra
l
    
Rate
Reductio
n
    
Rate Reduction
and Payment
Deferra
l
    
Tota
l
  
   
(In thousands
)
  
Commercial loans
   $
29,199
     $
-
     $
-
     $
29,199
  
Commercial mortgage loans
    
11,504
      
5,871
      
15,468
      
32,843
  
Residential mortgage loans
    
3,416
      
335
      
2,772
      
6,523
  
Total accruing TDRs
   $
44,119
     $
6,206
     $
18,240
     $
68,565
  
   
December 31, 201
6
  
                         
Accruing TDR
s
  
Payment
Deferra
l
    
Rate
Reductio
n
    
Rate Reduction and
Payment Deferra
l
    
Tota
l
  
   
(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]
   
December 31, 201
7
  
       
Non-accrual TDR
s
  
Payment
Deferra
l
    
Rate
Reductio
n
    
Rate Reduction
and Payment
Deferra
l
    
Tota
l
  
   
(In thousands
)
  
Commercial loans
   $
12,944
     $
-
     $
-
     $
12,944
  
Commercial mortgage loans
    
6,231
      
1,677
      
11,113
      
19,021
  
Residential mortgage loans
    
1,297
      
-
      
154
      
1,451
  
Total non-accrual TDRs
   $
20,472
     $
1,677
     $
11,267
     $
33,416
  
   
December 31, 201
6
  
                         
Non-accrual TDR
s
  
Payment
Deferra
l
    
Rate
Reductio
n
    
Rate Reduction and
Payment Deferra
l
    
Tota
l
  
   
(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]
Accruing TDR
s
  
201
7
    
201
6
    
201
5
  
   
(In thousands
)
  
Beginning balance
   $
65,393
     $
81,680
     $
104,356
  
New restructurings
    
73,426
      
26,965
      
17,752
  
Restructured loans restored to accrual status
    
-
      
10,303
      
723
  
Charge-offs
    
-
      
(88
 )    
(104
 )
Payments
    
(54,095
 )    
(24,192
 )    
(30,858
 )
Restructured loans placed on non-accrual
    
(13,919
 )    
(13,984
 )    
(10,189
 )
Expiration of loan concession
    
(2,240
 )    
(15,291
 )    
-
  
Ending balance
   $
68,565
     $
65,393
     $
81,680
  
Non-accrual TDRs
  
201
7
    
201
6
    
201
5
  
   
(In thousands
)
  
Beginning balance
   $
29,722
     $
39,923
     $
41,618
  
New restructurings
    
4,009
      
6,940
      
2,006
  
Restructured loans placed on non-accrual
    
13,919
      
13,984
      
10,189
  
Charge-offs
    
(1,650
 )    
(5,271
 )    
(3,246
 )
Payments
    
(11,341
 )    
(15,551
 )    
(9,921
 )
Foreclosures
    
(1,243
 )    
-
      
-
  
Restructured loans restored to accrual status
    
-
      
(10,303
 )    
(723
 )
Ending balance
   $
33,416
     $
29,722
     $
39,923
  
Financing Receivable Credit Quality Indicators [Table Text Block]
   
As of December 31, 201
7
  
   
Pass/Watch
    
Special Mention
    
Substandard
    
Doubtful
    
Total
  
   
(In thousands)
  
Commercial loans
   $
2,281,698
     $
118,056
     $
61,503
     $
9
     $
2,461,266
  
Real estate construction loans
    
616,411
      
54,209
      
8,185
      
-
      
678,805
  
Commercial mortgage loans
    
6,004,258
      
308,924
      
169,513
      
-
      
6,482,695
  
Residential mortgage and equity lines
    
3,232,606
      
-
      
9,748
      
-
      
3,242,354
  
Installment and other loans
    
5,170
      
-
      
-
      
-
      
5,170
  
Total gross loans
   $
12,140,143
     $
481,189
     $
248,949
     $
9
     $
12,870,290
  
                                         
Loans held for sale
   $
-
     $
-
     $
8,000
     $
-
     $
8,000
  
   
As of December 31, 201
6
  
   
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 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 Estat
e
    
Commercia
l
    
Residentia
l
    
Installment
    
 
 
 
   
Commercia
l
    
Constructio
n
    
Mortgag
e
    
Mortgag
e
    
and Othe
r
    
 
 
 
   
Loan
s
    
Loan
s
    
Loan
s
    
and Equity Line
s
    
Loan
s
    
Tota
l
  
   
(In thousands
)
  
2016 Beginning Balance
   $
56,199
     $
22,170
     $
49,440
     $
11,145
     $
9
     $
138,963
  
                                                 
Provision/(reversal) for loan losses
    
1,815
      
(6,819
 )    
(11,123
 )    
475
      
2
      
(15,650
 )
                                                 
Charge-offs
    
(12,955
 )    
-
      
(5,948
 )    
-
      
-
      
(18,903
 )
Recoveries
    
4,144
      
7,917
      
2,495
      
-
      
-
      
14,556
  
Net (Charge-offs)/Recoveries
    
(8,811
 )    
7,917
      
(3,453
 )    
-
      
-
      
(4,347
 )
                                                 
2016 Ending Balance
   $
49,203
     $
23,268
     $
34,864
     $
11,620
     $
11
     $
118,966
  
Reserve for impaired loans
   $
1,827
     $
-
     $
573
     $
396
     $
-
     $
2,796
  
Reserve for non-impaired loans
   $
47,376
     $
23,268
     $
34,291
     $
11,224
     $
11
     $
116,170
  
Reserve for off-balance sheet
credit commitments
   $
2,091
     $
940
     $
41
     $
146
     $
6
     $
3,224
  
                                                 
2017 Beginning Balance
   $
49,203
     $
23,268
     $
34,864
     $
11,620
     $
11
     $
118,966
  
                                                 
Provision/(reversal) for loan losses
    
117
      
955
      
(2,778
 )    
(798
 )    
4
      
(2,500
 )
                                                 
Charge-offs
    
(3,313
 )    
-
      
(860
 )    
-
      
-
      
(4,173
 )
Recoveries
    
3,402
      
229
      
7,329
      
19
      
7
      
10,986
  
Net (Charge-offs)/Recoveries
    
89
      
229
      
6,469
      
19
      
7
      
6,813
  
                                                 
2017 Ending Balance
   $
49,796
     $
24,838
     $
37,610
     $
11,013
     $
22
     $
123,279
  
Reserve for impaired loans
   $
43
     $
-
     $
1,738
     $
353
     $
-
     $
2,134
  
Reserve for non-impaired loans
   $
49,753
     $
24,838
     $
35,872
     $
10,660
     $
22
     $
121,145
  
Reserve for off-balance sheet
credit commitments
   $
2,919
     $
1,360
     $
114
     $
190
     $
5
     $
4,588
  
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
   
For the year ended December 31
,
  
   
201
7
    
201
6
    
201
5
  
Allowance for Loan Losses
  
(In thousands
)
  
Balance at beginning of year
   $
118,966
     $
138,963
     $
161,420
  
Reversal for credit losses
    
(2,500
 )    
(15,650
 )    
(11,400
 )
Loans charged off
    
(4,173
 )    
(18,903
 )    
(20,427
 )
Recoveries of charged off loans
    
10,986
      
14,556
      
9,370
  
Balance at end of year
   $
123,279
     $
118,966
     $
138,963
  
                         
Reserve for Off-balance Sheet Credit Commitment
s
  
 
 
 
  
 
 
 
  
 
 
 
Balance at beginning of year
   $
3,224
     $
1,494
     $
1,949
  
Provision/(reversal) for credit losses and transfers
    
1,364
      
1,730
      
(455
 )
Balance at end of year
   $
4,588
     $
3,224
     $
1,494
  
Impairment Method [Member]  
Notes Tables  
Impaired Financing Receivables [Table Text Block]
   
 
 
 
  
Real Estat
e
    
Commercia
l
    
Residentia
l
    
 
 
 
  
 
 
 
   
Commercia
l
    
Constructio
n
    
Mortgag
e
    
Mortgag
e
    
Consume
r
    
 
 
 
   
Loan
s
    
Loan
s
    
Loan
s
    
and Equity Line
s
    
and Othe
r
    
Tota
l
  
   
(In thousands
)
  
December 31, 201
7
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Loans individually evaluated for impairmen
t
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
43
     $
-
     $
1,738
     $
353
     $
-
     $
2,134
  
Balance
   $
43,495
     $
8,185
     $
52,664
     $
13,009
     $
-
     $
117,353
  
                                                 
Loans collectively evaluated for impairmen
t
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
49,753
     $
24,838
     $
35,872
     $
10,660
     $
22
     $
121,145
  
Balance
   $
2,417,771
     $
670,620
     $
6,430,031
     $
3,229,345
     $
5,170
     $
12,752,937
  
                                                 
Total allowance
   $
49,796
     $
24,838
     $
37,610
     $
11,013
     $
22
     $
123,279
  
Total balance
   $
2,461,266
     $
678,805
     $
6,482,695
     $
3,242,354
     $
5,170
     $
12,870,290
  
                                                 
December 31, 201
6
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Loans individually evaluated for impairmen
t
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
1,827
     $
-
     $
573
     $
396
     $
-
     $
2,796
  
Balance   $
27,761
     $
5,458
     $
64,470
     $
17,385
     $
-
     $
115,074
  
                                                 
Loans collectively evaluated for impairmen
t
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
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