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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

Investment securities available for sale (AFS):

 
 
March 31, 2018
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency
 
$
6,821
 
 
$
—
 
 
$
(166
) 
 
$
6,655
 
US Agency mortgage-backed securities
 
 
82,648
 
 
 
396
 
 
 
(1,498
) 
 
 
81,546
 
Taxable municipal
 
 
8,929
 
 
 
8
 
 
 
(347
) 
 
 
8,590
 
Corporate bonds
 
 
35,922
 
 
 
254
 
 
 
(577
) 
 
 
35,599
 
Total
 
$
134,320
 
 
$
658
 
 
$
(2,588
) 
 
$
132,390
 

Investment securities held to maturity (HTM):

 
 
March 31, 2018
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency mortgage-backed securities
 
$
8,809
 
 
$
99
 
 
$
(157
) 
 
$
8,751
 
Taxable municipal
 
 
23,813
 
 
 
69
 
 
 
(590
) 
 
 
23,292
 
Corporate bonds and other securities
 
 
6,041
 
 
 
33
 
 
 
(76
) 
 
 
5,998
 
Total
 
$
38,663
 
 
$
201
 
 
$
(823
) 
 
$
38,041
 

Investment securities available for sale (AFS):

 
 
December 31, 2017
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency
 
$
6,612
 
 
$
—
 
 
$
(40
) 
 
$
6,572
 
US Agency mortgage-backed securities
 
 
79,854
 
 
 
611
 
 
 
(719
) 
 
 
79,746
 
Taxable municipal
 
 
7,198
 
 
 
27
 
 
 
(189
) 
 
 
7,036
 
Corporate bonds
 
 
35,886
 
 
 
322
 
 
 
(424
) 
 
 
35,784
 
Total
 
$
129,550
 
 
$
960
 
 
$
(1,372
) 
 
$
129,138
 

Investment securities held to maturity (HTM):

 
 
December 31, 2017
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency mortgage-backed securities
 
$
9,740
 
 
$
149
 
 
$
(45
) 
 
$
9,844
 
Taxable municipal
 
 
22,970
 
 
 
203
 
 
 
(238
) 
 
 
22,935
 
Corporate bonds and other securities
 
 
6,042
 
 
 
38
 
 
 
(48
) 
 
 
6,032
 
Total
 
$
38,752
 
 
$
390
 
 
$
(331
) 
 
$
38,811
 
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present information concerning investments with unrealized losses as of March 31, 2018 and December 31, 2017 (in thousands):

Total investment securities:

 
 
March 31, 2018
  
 
Less than 12 months
 
12 months or longer
 
Total
  
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
US Agency
 
$
6,005
 
 
$
(165
) 
 
$
400
 
 
$
(1
) 
 
$
6,405
 
 
$
(166
) 
US Agency mortgage-backed securities
 
 
51,033
 
 
 
(985
) 
 
 
17,925
 
 
 
(670
) 
 
 
68,958
 
 
 
(1,655
) 
Taxable municipal
 
 
18,562
 
 
 
(412
) 
 
 
8,431
 
 
 
(525
) 
 
 
26,993
 
 
 
(937
) 
Corporate bonds and other securities
 
 
15,181
 
 
 
(233
) 
 
 
13,635
 
 
 
(420
) 
 
 
28,816
 
 
 
(653
) 
Total
 
$
90,781
 
 
$
(1,795
) 
 
$
40,391
 
 
$
(1,616
) 
 
$
131,172
 
 
$
(3,411
) 

Total investment securities:

 
 
December 31, 2017
  
 
Less than 12 months
 
12 months or longer
 
Total
  
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
US Agency
 
$
5,923
 
 
$
(39
) 
 
$
399
 
 
$
(1
) 
 
$
6,322
 
 
$
(40
) 
US Agency mortgage-backed securities
 
 
36,783
 
 
 
(253
) 
 
 
22,625
 
 
 
(511
) 
 
 
59,408
 
 
 
(764
) 
Taxable municipal
 
 
8,657
 
 
 
(109
) 
 
 
7,727
 
 
 
(318
) 
 
 
16,384
 
 
 
(427
) 
Corporate bonds and other securities
 
 
7,123
 
 
 
(71
) 
 
 
13,655
 
 
 
(401
) 
 
 
20,778
 
 
 
(472
) 
Total
 
$
58,486
 
 
$
(472
) 
 
$
44,406
 
 
$
(1,231
) 
 
$
102,892
 
 
$
(1,703
) 
Schedule of Contractual Maturities of Securities [Table Text Block]

Total investment securities:

 
 
March 31, 2018
  
 
Available for sale
 
Held to maturity
  
 
Cost Basis
 
Fair Value
 
Cost Basis
 
Fair Value
Within 1 year
 
$
400
 
 
$
400
 
 
$
2,000
 
 
$
1,983
 
After 1 year but within 5 years
 
 
14,019
 
 
 
13,920
 
 
 
2,671
 
 
 
2,610
 
After 5 years but within 10 years
 
 
47,258
 
 
 
46,766
 
 
 
14,441
 
 
 
14,200
 
After 10 years but within 15 years
 
 
26,940
 
 
 
26,332
 
 
 
14,789
 
 
 
14,556
 
Over 15 years
 
 
45,703
 
 
 
44,972
 
 
 
4,762
 
 
 
4,692
 
Total
 
$
134,320
 
 
$
132,390
 
 
$
38,663
 
 
$
38,041