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Note 3 - Investment Securities (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
December 31, 2017
 
 
 
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
 
 
Cost
   
Gains
   
Losses
   
Value
 
(Amounts in thousands)
                               
U.S. Agency securities
  $
11,289
    $
17
    $
(10
)   $
11,296
 
U.S. Treasury securities
   
19,987
     
-
     
(16
)    
19,971
 
Municipal securities
   
101,552
     
2,203
     
(107
)    
103,648
 
Single issue trust preferred securities
   
9,367
     
-
     
(483
)    
8,884
 
Mortgage-backed Agency securities
   
22,095
     
46
     
(415
)    
21,726
 
Equity securities
   
55
     
-
     
-
     
55
 
Total securities available for sale
  $
164,345
    $
2,266
    $
(1,031
)   $
165,580
 
   
December 31, 2016
 
 
 
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
 
 
Cost
   
Gains
   
Losses
   
Value
 
(Amounts in thousands)
                               
U.S. Agency securities
  $
1,342
    $
3
    $
-
    $
1,345
 
Municipal securities
   
111,659
     
2,258
     
(586
)    
113,331
 
Single issue trust preferred securities
   
22,104
     
-
     
(2,165
)    
19,939
 
Mortgage-backed Agency securities
   
31,290
     
66
     
(465
)    
30,891
 
Equity securities
   
55
     
18
     
-
     
73
 
Total securities available for sale
  $
166,450
    $
2,345
    $
(3,216
)   $
165,579
 
Investments Classified by Contractual Maturity Date [Table Text Block]
(Amounts in thousands)
 
U.S. Agency
Securities
   
U.S. Treasury
Securities
   
Municipal
Securities
   
Corporate
Notes
   
Total
 
Amortized cost maturity:
                                       
One year or less
  $
10,065
    $
19,987
    $
-
    $
-
    $
30,052
 
After one year through five years
   
-
     
-
     
7,193
     
-
     
7,193
 
After five years through ten years
   
1,224
     
-
     
90,062
     
9,367
     
100,653
 
After ten years
   
-
     
-
     
4,297
     
-
     
4,297
 
Amortized cost
  $
11,289
    $
19,987
    $
101,552
    $
9,367
     
142,195
 
Mortgage-backed securities
   
 
     
 
     
 
     
 
     
22,095
 
Equity securities
   
 
     
 
     
 
     
 
     
55
 
Total amortized cost
   
 
     
 
     
 
     
 
    $
164,345
 
                                         
Fair value maturity:
                                       
One year or less
  $
10,055
    $
19,971
    $
-
    $
-
    $
30,026
 
After one year through five years
   
-
     
-
     
7,308
     
-
     
7,308
 
After five years through ten years
   
1,241
     
-
     
91,886
     
8,884
     
102,011
 
After ten years
   
-
     
-
     
4,454
     
-
     
4,454
 
Fair value
  $
11,296
    $
19,971
    $
103,648
    $
8,884
     
143,799
 
Mortgage-backed securities
   
 
     
 
     
 
     
 
     
21,726
 
Equity securities
   
 
     
 
     
 
     
 
     
55
 
Total fair value
   
 
     
 
     
 
     
 
    $
165,580
 
(Amounts in thousands)
 
U.S. Agency
Securities
   
Corporate 
Notes
   
Total
 
Amortized cost maturity:
                       
One year or less
  $
-
    $
-
    $
-
 
After one year through five years
   
17,937
     
7,212
     
25,149
 
After five years through ten years
   
-
     
-
     
-
 
After ten years
   
-
     
-
     
-
 
Total amortized cost
  $
17,937
    $
7,212
    $
25,149
 
                         
Fair value maturity:
                       
One year or less
  $
-
    $
-
    $
-
 
After one year through five years
   
17,888
     
7,196
     
25,084
 
After five years through ten years
   
-
     
-
     
-
 
After ten years
   
-
     
-
     
-
 
Total fair value
  $
17,888
    $
7,196
    $
25,084
 
Held-to-maturity Securities [Table Text Block]
   
December 31, 2017
 
 
 
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
 
 
Cost
   
Gains
   
Losses
   
Value
 
(Amounts in thousands)
                               
U.S. Agency securities
  $
17,937
    $
-
    $
(49
)   $
17,888
 
Corporate securities
   
7,212
     
-
     
(16
)    
7,196
 
Total securities held to maturity
  $
25,149
    $
-
    $
(65
)   $
25,084
 
   
December 31, 2016
 
 
 
Amortized
   
Unrealized
   
Unrealized
   
Fair
 
 
 
Cost
   
Gains
   
Losses
   
Value
 
(Amounts in thousands)
                               
U.S. Agency securities
  $
36,741
    $
124
    $
-
    $
36,865
 
Corporate securities
   
10,392
     
11
     
(2
)    
10,401
 
Total securities held to maturity
  $
47,133
    $
135
    $
(2
)   $
47,266
 
Schedule of Available-for-sale and Held-to-maturity Municipal Securities By State [Table Text Block]
   
December 31, 2017
 
 
 
Percent of
Municipal Portfolio
   
Amortized Cost
   
Unrealized Gains
   
Unrealized Losses
   
Fair Value
 
(Amounts in thousands)
                                       
New York
   
10.64
%   $
10,804
    $
223
    $
-
    $
11,027
 
Minnesota
   
10.12
%    
10,280
     
211
     
(1
)    
10,490
 
Wisconsin
   
8.74
%    
8,913
     
147
     
-
     
9,060
 
Massachusetts
   
8.57
%    
8,691
     
208
     
(14
)    
8,885
 
Ohio
   
8.36
%    
8,551
     
123
     
(13
)    
8,661
 
Texas
   
7.23
%    
7,388
     
122
     
(21
)    
7,489
 
Connecticut
   
6.82
%    
6,929
     
142
     
-
     
7,071
 
Iowa
   
5.27
%    
5,463
     
30
     
(35
)    
5,458
 
New Jersey
   
4.67
%    
4,670
     
167
     
-
     
4,837
 
Other
   
29.59
%    
29,863
     
830
     
(23
)    
30,670
 
Total
   
100.00
%   $
101,552
    $
2,203
    $
(107
)   $
103,648
 
   
December 31, 2016
 
 
 
Percent of
Municipal Portfolio
   
Amortized Cost
   
Unrealized Gains
   
Unrealized Losses
   
Fair Value
 
(Amounts in thousands)
                                       
New York
   
11.66
%   $
12,876
    $
334
    $
-
    $
13,210
 
Minnesota
   
9.70
%    
10,796
     
232
     
(40
)    
10,988
 
Wisconsin
   
8.66
%    
9,786
     
74
     
(42
)    
9,818
 
Ohio
   
8.50
%    
9,599
     
125
     
(88
)    
9,636
 
Massachusetts
   
8.45
%    
9,355
     
229
     
(10
)    
9,574
 
New Jersey
   
7.14
%    
7,891
     
202
     
-
     
8,093
 
Connecticut
   
6.90
%    
7,628
     
190
     
-
     
7,818
 
Texas
   
6.55
%    
7,397
     
130
     
(103
)    
7,424
 
Iowa
   
5.66
%    
6,467
     
36
     
(88
)    
6,415
 
Other
   
26.78
%    
29,864
     
706
     
(215
)    
30,355
 
Total
   
100.00
%   $
111,659
    $
2,258
    $
(586
)   $
113,331
 
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
   
December 31, 2017
 
 
 
Less than 12 Months
   
12 Months or Longer
   
Total
 
 
 
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
 
 
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
(Amounts in thousands)
                                               
U.S. Agency securities
  $
10,054
    $
(10
)   $
-
    $
-
    $
10,054
    $
(10
)
U.S. Treasury securities
   
19,972
     
(16
)    
-
     
-
     
19,972
     
(16
)
Municipal securities
   
8,047
     
(55
)    
2,314
     
(52
)    
10,361
     
(107
)
Single issue trust preferred securities
   
-
     
-
     
8,884
     
(483
)    
8,884
     
(483
)
Mortgage-backed Agency securities
   
4,276
     
(25
)    
14,069
     
(390
)    
18,345
     
(415
)
Total
  $
42,349
    $
(106
)   $
25,267
    $
(925
)   $
67,616
    $
(1,031
)
   
December 31, 2016
 
 
 
Less than 12 Months
   
12 Months or Longer
   
Total
 
 
 
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
 
 
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
(Amounts in thousands)
                                               
Municipal securities
  $
24,252
    $
(527
)   $
715
    $
(59
)   $
24,967
    $
(586
)
Single issue trust preferred securities
   
-
     
-
     
19,939
     
(2,165
)    
19,939
     
(2,165
)
Mortgage-backed Agency securities
   
12,834
     
(166
)    
11,851
     
(299
)    
24,685
     
(465
)
Total
  $
37,086
    $
(693
)   $
32,505
    $
(2,523
)   $
69,591
    $
(3,216
)
Schedule of Held to Maturity Debt Securities [Table Text Block]
   
December 31, 2017
 
 
 
Less than 12 Months
   
12 Months or Longer
   
Total
 
 
 
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
 
 
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
(Amounts in thousands)
                                               
U.S. Agency securities
  $
17,888
    $
(49
)   $
-
    $
-
    $
17,888
    $
(49
)
Corporate securities
   
7,196
     
(16
)    
-
     
-
     
7,196
     
(16
)
Total
  $
25,084
    $
(65
)   $
-
    $
-
    $
25,084
    $
(65
)
   
December 31, 2016
 
 
 
Less than 12 Months
   
12 Months or Longer
   
Total
 
 
 
Fair
   
Unrealized
   
Fair
   
Unrealized
   
Fair
   
Unrealized
 
 
 
Value
   
Losses
   
Value
   
Losses
   
Value
   
Losses
 
(Amounts in thousands)
                                               
Corporate securities
  $
3,533
    $
(2
)   $
-
    $
-
    $
3,533
    $
(2
)
Total
  $
3,533
    $
(2
)   $
-
    $
-
    $
3,533
    $
(2
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
   
Year Ended December 31,
 
   
2017
   
2016
   
2015
 
(Amounts in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
  $
-
    $
-
    $
-
 
Additions for credit losses on securities not previously recognized
   
-
     
4,646
     
-
 
Additions for credit losses on securities previously recognized
   
-
     
-
     
-
 
Reduction for securities sold/realized losses
   
-
     
(4,646
)    
-
 
Ending balance
  $
-
    $
-
    $
-
 
Realized Gain (Loss) on Investments [Table Text Block]
   
Year Ended December 31,
 
 
 
2017
   
2016
   
2015
 
(Amounts in thousands)
                       
Gross realized gains
  $
-
    $
757
    $
363
 
Gross realized losses
   
(661
)    
(422
)    
(219
)
Net (loss) gain on sale of securities
  $
(661
)   $
335
    $
144