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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Investment securities available for sale (AFS):
 
 
 
June 30, 2018
 
 
 
Cost
Basis
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
US Agency
 
$
6,768
 
 
$
—
 
 
$
(238
)
 
$
6,530
 
US Agency mortgage-backed securities
 
 
84,185
 
 
 
313
 
 
 
(1,861
)
 
 
82,637
 
Municipal
 
 
10,755
 
 
 
29
 
 
 
(392
)
 
 
10,392
 
Corporate bonds
 
 
36,901
 
 
 
155
 
 
 
(760
)
 
 
36,296
 
Total
 
$
138,609
 
 
$
497
 
 
$
(3,251
)
 
$
135,855
 
 
Investment securities held to maturity (HTM):
 
 
 
June 30, 2018
 
 
 
Cost
Basis
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
US Agency mortgage-backed securities
 
$
8,524
 
 
$
79
 
 
$
(192
)
 
$
8,411
 
Municipal
 
 
24,352
 
 
 
50
 
 
 
(679
)
 
 
23,723
 
Corporate bonds and other securities
 
 
6,040
 
 
 
13
 
 
 
(81
)
 
 
5,972
 
Total
 
$
38,916
 
 
$
142
 
 
$
(952
)
 
$
38,106
 
 
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
 
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
 
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 June 30, 2018 and December 31, 2017 (in thousands):
 
Total investment securities:
 
 
 
June 30, 2018
 
 
 
Less than 12 months
 
 
12 months or longer
 
 
Total
 
 
 
Fair
Value
 
 
Unrealized
Losses
 
 
Fair
Value
 
 
Unrealized
Losses
 
 
Fair
Value
 
 
Unrealized
Losses
 
US Agency
 
$
4,684
 
 
$
(158
)
 
$
1,846
 
 
$
(80
)
 
$
6,530
 
 
$
(238
)
US Agency mortgage-backed securities
 
 
53,287
 
 
 
(1,273
)
 
 
18,095
 
 
 
(780
)
 
 
71,382
 
 
 
(2,053
)
Municipal
 
 
19,815
 
 
 
(469
)
 
 
9,465
 
 
 
(602
)
 
 
29,280
 
 
 
(1,071
)
Corporate bonds and other securities
 
 
18,520
 
 
 
(371
)
 
 
12,585
 
 
 
(470
)
 
 
31,105
 
 
 
(841
)
Total
 
$
96,306
 
 
$
(2,271
)
 
$
41,991
 
 
$
(1,932
)
 
$
138,297
 
 
$
(4,203
)
 
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
)
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:
 
 
 
June 30, 2018
 
 
 
Available for sale
 
 
Held to maturity
 
 
 
Cost
Basis
 
 
Fair
Value
 
 
Cost
Basis
 
 
Fair
Value
 
Within 1 year
 
$
77
 
 
$
77
 
 
$
1,000
 
 
$
995
 
After 1 year but within 5 years
 
 
18,827
 
 
 
18,618
 
 
 
3,665
 
 
 
3,593
 
After 5 years but within 10 years
 
 
47,901
 
 
 
46,930
 
 
 
14,981
 
 
 
14,656
 
After 10 years but within 15 years
 
 
28,160
 
 
 
27,567
 
 
 
14,663
 
 
 
14,351
 
Over 15 years
 
 
43,644
 
 
 
42,663
 
 
 
4,607
 
 
 
4,511
 
Total
 
$
138,609
 
 
$
135,855
 
 
$
38,916
 
 
$
38,106