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Note 7 - Loans (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
June 30, 2017
    
December 31, 2016
  
   
(In thousands)
  
Commercial loans 
   $
2,215,960
     $
2,248,187
  
Residential mortgage loans 
    
2,756,055
      
2,444,048
  
Commercial mortgage loans 
    
5,883,770
      
5,785,248
  
Real estate construction loans 
    
547,737
      
548,088
  
Equity lines 
    
162,153
      
171,711
  
Installment & other loans 
    
5,557
      
3,993
  
Gross loans 
   $
11,571,232
     $
11,201,275
  
Allowance for loan losses
    
(115,809
 )    
(118,966
 )
Unamortized deferred loan fees
    
(3,788
 )    
(4,994
 )
Total loans, net
   $
11,451,635
     $
11,077,315
  
Loans held for sale 
   $
-
     $
7,500
  
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
   
June 30, 2017
  
Accruing TDRs
  
Payment
Deferral
    
Rate
Reduction
    
 
Rate Reduction
and Payment
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
5,463
     $
-
     $
331
     $
5,794
  
Real estate construction loans
    
28,472
      
-
      
-
      
28,472
  
Commercial mortgage loans
    
25,625
      
5,917
      
6,322
      
37,864
  
Residential mortgage loans
    
4,324
      
529
      
2,836
      
7,689
  
Total accruing TDRs
   $
63,884
     $
6,446
     $
9,489
     $
79,819
  
   
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]
   
June 30, 2017
  
Non-accrual TDRs
  
Payment
Deferral
    
Rate
Reduction
    
 
Rate Reduction
and Payment
Deferral
    
Total
  
   
(In thousands)
  
Commercial loans
   $
12,804
     $
-
     $
-
     $
12,804
  
Commercial mortgage loans
    
707
      
1,736
      
14,514
      
16,957
  
Residential mortgage loans
    
123
      
-
      
161
      
284
  
Total non-accrual TDRs
   $
13,634
     $
1,736
     $
14,675
     $
30,045
  
   
December 31, 2016
  
Non-accrual TDRs
  
Payment
Deferral
    
Rate
Reduction
    
 
Rate Reduction
and Payment
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 June 30,
    
Six months ended June 30,
  
Accruing TDRs
  
2017
    
2016
    
2017
    
2016
  
   
(In thousands)
  
Beginning balance
   $
80,419
     $
90,172
     $
65,393
     $
81,680
  
New restructurings
    
500
      
2,065
      
28,183
      
2,065
  
Restructured loans restored to accrual status
    
-
      
-
      
-
      
10,303
  
Payments
    
(1,100
 )    
(1,505
 )    
(5,695
 )    
(3,316
 )
Restructured loans placed on non-accrual status
    
-
      
(1,138
 )    
(5,822
 )    
(1,138
 )
Expiration of loan concession upon renewal
    
-
      
(14,886
 )    
(2,240
 )    
(14,886
 )
Ending balance
   $
79,819
     $
74,708
     $
79,819
     $
74,708
  
   
Three months ended June 30,
    
Six months ended June 30,
  
Non-accrual TDRs
  
2017
    
2016
    
2017
    
2016
  
   
(In thousands)
  
Beginning balance
   $
32,779
     $
23,209
     $
29,722
     $
39,923
  
New restructurings
    
-
      
3,145
      
-
      
3,145
  
Restructured loans placed on non-accrual status
    
-
      
1,138
      
5,822
      
1,138
  
Charge-offs
    
(497
 )    
(945
 )    
(1,546
 )    
(945
 )
Payments
    
(2,237
 )    
(1,105
 )    
(3,227
 )    
(7,516
 )
Foreclosures
    
-
      
-
      
(726
 )    
-
  
Restructured loans restored to accrual status
    
-
      
-
      
-
      
(10,303
 )
Ending balance
   $
30,045
     $
25,442
     $
30,045
     $
25,442
  
Financing Receivable Credit Quality Indicators [Table Text Block]
   
June 30, 2017
  
   
Pass/Watch
   
Special Mention
   
Substandard
   
Doubtful
   
Total
 
   
(In thousands)
  
Commercial loans
   $
2,011,170
     $
142,907
     $
61,830
     $
53
     $
2,215,960
  
Real estate construction loans
    
451,043
      
51,637
      
45,057
      
-
      
547,737
  
Commercial mortgage loans
    
5,450,457
      
288,556
      
144,757
      
-
      
5,883,770
  
Residential mortgage loans and equity lines
    
2,909,723
      
-
      
8,485
      
-
      
2,918,208
  
Installment and other loans
    
5,557
      
-
      
-
      
-
      
5,557
  
Total gross loans
  $
10,827,950
     $
483,100
     $
260,129
     $
53
     $
11,571,232
  
                                         
Loans held for sale
   $
-
     $
-
     $
-
     $
-
     $
-
  
   
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
  
Impaired Financing Receivables [Table Text Block]
   
Impaired Loans
  
   
Average Recorded Investment
   
Interest Income Recognized
 
   
Three months ended
    
Six months ended
    
Three months ended
    
Six months ended
  
   
June 30,
    
June 30,
    
June 30,
    
June 30,
  
   
2017
    
2016
    
2017
    
2016
    
2017
    
2016
    
2017
    
2016
  
   
(In thousands)
  
Commercial loans
   $
19,376
     $
14,940
     $
21,345
     $
13,805
     $
86
     $
167
     $
171
     $
370
  
Real estate construction loans
    
42,752
      
9,923
      
29,912
      
15,107
      
356
      
-
      
696
      
-
  
Commercial mortgage loans
    
60,295
      
90,971
      
60,847
      
89,212
      
445
      
713
      
898
      
1,513
  
Residential mortgage loans and equity lines
    
15,172
      
17,112
      
15,854
      
17,052
      
107
      
140
      
211
      
285
  
Total impaired loans
   $
137,595
     $
132,946
     $
127,958
     $
135,176
     $
994
     $
1,020
     $
1,976
     $
2,168
  
Schedule Of Impaired Loans And Related Allowance And Charge Off [Table Text Block]
   
Impaired Loans
  
   
June 30, 2017
    
December 31, 2016
  
   
Unpaid
Principal
Balance
    
Recorded
Investment
   
Allowance
   
Unpaid
Principal
Balance
    
Recorded
Investment
   
Allowance
 
   
(In thousands)
  
                                                 
With no allocated allowance
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
18,200
     $
17,826
     $
-
     $
24,037
     $
23,121
     $
-
  
Real estate construction loans
    
45,545
      
45,057
      
-
      
5,776
      
5,458
      
-
  
Commercial mortgage loans
    
55,599
      
49,379
      
-
      
60,522
      
54,453
      
-
  
Residential mortgage loans and equity lines
    
2,920
      
2,920
      
-
      
5,472
      
5,310
      
-
  
Subtotal
   $
122,264
     $
115,182
     $
-
     $
95,807
     $
88,342
     $
-
  
With allocated allowance
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial loans
   $
3,665
     $
1,032
     $
145
     $
5,216
     $
4,640
     $
1,827
  
Commercial mortgage loans
    
16,515
      
15,934
      
1,018
      
10,158
      
10,017
      
573
  
Residential mortgage loans and equity lines
    
13,099
      
11,715
      
398
      
13,263
      
12,075
      
396
  
Subtotal
   $
33,279
     $
28,681
     $
1,561
     $
28,637
     $
26,732
     $
2,796
  
Total impaired loans
   $
155,543
     $
143,863
     $
1,561
     $
124,444
     $
115,074
     $
2,796
  
Past Due Financing Receivables [Table Text Block]
   
June 30, 2017
  
   
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
  
Type of Loans:
  
(In thousands)
  
Commercial loans
   $
32,411
     $
515
     $
495
     $
13,064
     $
46,485
     $
2,169,475
     $
2,215,960
  
Real estate construction loans
    
-
      
-
      
-
      
16,585
      
16,585
      
531,152
      
547,737
  
Commercial mortgage loans
    
2,258
      
115
      
-
      
27,448
      
29,821
      
5,853,949
      
5,883,770
  
Residential mortgage loans and equity lines
    
164
      
480
      
-
      
6,947
      
7,591
      
2,910,617
      
2,918,208
  
Installment and other loans
    
-
      
-
      
-
      
-
      
-
      
5,557
      
5,557
  
Total loans
   $
34,833
     $
1,110
     $
495
     $
64,044
     $
100,482
     $
11,470,750
     $
11,571,232
  
   
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
  
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 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 June 30, 2017
    
June 30, 2017
  
   
No. of
Contracts
    
Pre-Modification
Outstanding Recorded Investment
   
Post-Modification
Outstanding Recorded Investment
   
Charge-offs
   
Specific Reserve
 
   
(Dollars in thousands)
  
                                         
Commercial loans
    
1
     $
500
     $
500
     $
-
     $
-
  
Total
    
1
     $
500
     $
500
     $
-
     $
-
  
   
Three months ended June 30, 2016
    
June 30, 2016
  
   
No. of
Contracts
    
Pre-Modification
Outstanding Recorded Investment
   
Post-Modification
Outstanding Recorded Investment
   
Charge-offs
   
Specific Reserve
 
   
(Dollars in thousands)
  
                                         
Commercial loans
    
4
     $
4,844
     $
4,844
     $
-
     $
148
  
Residential mortgage loans and equity lines
    
2
      
367
      
367
      
-
      
23
  
Total
    
6
     $
5,211
     $
5,211
     $
-
     $
171
  
   
Six months ended June 30, 2017
    
June 30, 2017
  
   
No. of
Contracts
    
Pre-Modification
Outstanding Recorded Investment
   
Post-Modification
Outstanding Recorded Investment
   
Charge-offs
   
Specific Reserve
 
   
(Dollars in thousands)
  
                                         
Commercial loans
    
1
     $
500
     $
500
     $
-
     $
-
  
Real estate construction loans
    
2
      
27,683
      
27,683
      
-
      
-
  
Total
    
3
     $
28,183
     $
28,183
     $
-
     $
-
  
   
Six months ended June 30, 2016
    
June 30, 2016
  
   
No. of
Contracts
    
Pre-Modification
Outstanding Recorded Investment
   
Post-Modification
Outstanding Recorded Investment
   
Charge-offs
   
Specific Reserve
 
   
(Dollars in thousands)
  
                                         
Commercial loans
    
4
     $
4,844
     $
4,844
     $
-
     $
148
  
Residential mortgage loans and equity lines
    
2
      
367
      
367
      
-
      
23
  
Total
    
6
     $
5,211
     $
5,211
     $
-
     $
171
  
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)
  
                                                 
March 31, 2017 Ending Balance
   $
47,276
     $
19,768
     $
35,960
     $
12,526
     $
14
      
115,544
  
Provision/(credit) for possible credit losses
    
(340
 )    
(1,971
 )    
477
      
1,831
      
3
      
-
  
Charge-offs
    
(527
 )    
-
      
-
      
-
      
-
      
(527
 )
Recoveries
    
335
      
47
      
403
      
7
      
-
      
792
  
Net (charge-offs)/recoveries
    
(192
 )    
47
      
403
      
7
      
-
      
265
  
June 30, 2017 Ending Balance
   $
46,744
     $
17,844
     $
36,840
     $
14,364
     $
17
     $
115,809
  
                                                 
March 31, 2016 Ending Balance
   $
56,381
     $
12,744
     $
50,451
     $
14,969
     $
7
     $
134,552
  
                                                 
Provision/(credit) for possible credit losses
    
170
      
(2,038
 )    
(3,815
 )    
528
      
5
      
(5,150
 )
Charge-offs
    
(6,688
 )    
-
      
(945
 )    
-
      
-
      
(7,633
 )
Recoveries
    
727
      
47
      
399
      
6
      
-
      
1,179
  
Net (charge-offs)/recoveries
    
(5,961
 )    
47
      
(546
 )    
6
      
-
      
(6,454
 )
June 30, 2016 Ending Balance
   $
50,590
     $
10,753
     $
46,090
     $
15,503
     $
12
     $
122,948
  
   
 
 
 
  
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
    
(1,556
 )    
(5,520
 )    
1,840
      
2,729
      
7
      
(2,500
 )
Charge-offs
    
(1,730
 )    
-
      
(555
 )    
-
      
-
      
(2,285
 )
Recoveries
    
826
      
96
      
691
      
15
      
-
      
1,628
  
Net (charge-offs)/recoveries
    
(904
 )    
96
      
136
      
15
      
-
      
(657
 )
                                                 
June 30, 2017 Ending Balance
   $
46,743
     $
17,844
     $
36,840
     $
14,364
     $
18
     $
115,809
  
Reserve for impaired loans
   $
-
     $
-
     $
-
     $
-
     $
-
     $
-
  
Reserve for non-impaired loans
   $
46,743
     $
17,844
     $
36,840
     $
14,364
     $
18
     $
115,809
  
Reserve for off-balance sheet
credit commitments
   $
2,583
     $
1,707
     $
74
     $
143
     $
6
     $
4,513
  
                                                 
2016 Beginning Balance
   $
56,199
     $
22,170
     $
49,440
     $
11,145
     $
9
     $
138,963
  
Provision/(credit) for possible credit losses
    
1,435
      
(18,740
 )    
(2,837
 )    
4,488
      
3
      
(15,651
 )
Charge-offs
    
(8,758
 )    
-
      
(1,055
 )    
(148
 )    
-
      
(9,961
 )
Recoveries
    
1,714
      
7,323
      
542
      
18
      
-
      
9,597
  
Net (charge-offs)/recoveries
    
(7,044
 )    
7,323
      
(513
 )    
(130
 )    
-
      
(364
 )
                                                 
June 30, 2016 Ending Balance
   $
50,590
     $
10,753
     $
46,090
     $
15,503
     $
12
     $
122,948
  
Reserve for impaired loans
   $
1,395
     $
-
     $
5,891
     $
438
     $
-
     $
7,724
  
Reserve for non-impaired loans
   $
49,195
     $
10,753
     $
40,199
     $
15,065
     $
12
     $
115,224
  
Reserve for off-balance sheet
credit commitments
   $
1,969
     $
-
     $
34
     $
119
     $
2
     $
2,124
  
Impairment Method [Member]  
Notes Tables  
Impaired Financing Receivables [Table Text Block]
   
 
 
 
  
Real Estate
    
Commercial
    
Residential
    
 
 
 
  
 
 
 
   
Commercial
    
Construction
    
Mortgage
    
Mortgage Loans
    
Installment and
    
 
 
 
   
Loans
    
Loans
    
Loans
    
and Equity Lines
    
Other Loans
    
Total
  
   
(In thousands)
  
June 30, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Loans individually evaluated for impairment
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
145
     $
-
     $
1,018
     $
398
     $
-
     $
1,561
  
Balance
   $
18,858
     $
45,057
     $
65,313
     $
14,635
     $
-
     $
143,863
  
                                                 
Loans collectively evaluated for impairment
    
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Allowance
   $
46,599
     $
17,844
     $
35,822
     $
13,966
     $
17
     $
114,248
  
Balance
   $
2,197,102
     $
502,680
     $
5,818,457
     $
2,903,573
     $
5,557
     $
11,427,369
  
                                                 
Total allowance
   $
46,744
     $
17,844
     $
36,840
     $
14,364
     $
17
     $
115,809
  
Total balance
   $
2,215,960
     $
547,737
     $
5,883,770
     $
2,918,208
     $
5,557
     $
11,571,232
  
                                                 
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