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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The cost basis and fair values of investment securities are summarized as follows (in thousands):

Investment securities available for sale (AFS):

 
 
 
 
 
 
September 30, 2017
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency
 
$
5,435
 
 
$
1
 
 
$
(34
) 
 
$
5,402
 
US Agency mortgage-backed securities
 
 
80,756
 
 
 
866
 
 
 
(382
) 
 
 
81,240
 
Taxable municipal
 
 
7,203
 
 
 
30
 
 
 
(166
) 
 
 
7,067
 
Corporate bonds
 
 
35,886
 
 
 
327
 
 
 
(476
) 
 
 
35,737
 
Total
 
$
129,280
 
 
$
1,224
 
 
$
(1,058
) 
 
$
129,446
 

Investment securities held to maturity (HTM):

 
 
 
 
 
 
September 30, 2017
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency mortgage-backed securities
 
$
10,081
 
 
$
194
 
 
$
(23
) 
 
$
10,252
 
Taxable municipal
 
 
22,873
 
 
 
222
 
 
 
(314
) 
 
 
22,781
 
Corporate bonds and other securities
 
 
6,043
 
 
 
29
 
 
 
(46
) 
 
 
6,026
 
Total
 
$
38,997
 
 
$
445
 
 
$
(383
) 
 
$
39,059
 

Investment securities available for sale (AFS):

 
 
 
 
 
 
December 31, 2016
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency
 
$
400
 
 
$
—
 
 
$
(2
) 
 
$
398
 
US Agency mortgage-backed securities
 
 
88,738
 
 
 
1,132
 
 
 
(686
) 
 
 
89,184
 
Taxable municipal
 
 
3,793
 
 
 
3
 
 
 
(174
) 
 
 
3,622
 
Corporate bonds
 
 
34,403
 
 
 
194
 
 
 
(724
) 
 
 
33,873
 
Total
 
$
127,334
 
 
$
1,329
 
 
$
(1,586
) 
 
$
127,077
 

Investment securities held to maturity (HTM):

 
 
 
 
 
 
December 31, 2016
  
 
Cost
Basis
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
US Agency mortgage-backed securities
 
$
11,177
 
 
$
180
 
 
$
(79
) 
 
$
11,278
 
Taxable municipal
 
 
13,441
 
 
 
70
 
 
 
(348
) 
 
 
13,163
 
Corporate bonds and other securities
 
 
6,047
 
 
 
15
 
 
 
(83
) 
 
 
5,979
 
Total
 
$
30,665
 
 
$
265
 
 
$
(510
) 
 
$
30,420
 
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present information concerning investments with unrealized losses as of September 30, 2017 and December 31, 2016 (in thousands):

Total investment securities:

 
 
 
 
 
 
 
 
September 30, 2017
  
 
Less than 12 months
 
12 months or longer
 
Total
  
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
US Agency
 
$
3,990
 
 
$
(33
) 
 
$
399
 
 
$
(1
) 
 
$
4,389
 
 
$
(34
) 
US Agency mortgage-backed
securities
 
 
38,127
 
 
 
(321
) 
 
 
3,239
 
 
 
(84
) 
 
 
41,366
 
 
 
(405
) 
Taxable municipal
 
 
11,724
 
 
 
(377
) 
 
 
2,172
 
 
 
(103
) 
 
 
13,896
 
 
 
(480
) 
Corporate bonds and other
securities
 
 
12,414
 
 
 
(205
) 
 
 
10,265
 
 
 
(317
) 
 
 
22,679
 
 
 
(522
) 
Total
 
$
66,255
 
 
$
(936
) 
 
$
16,075
 
 
$
(505
) 
 
$
82,330
 
 
$
(1,441
) 

Total investment securities:

 
 
 
 
 
 
 
 
December 31, 2016
  
 
Less than 12 months
 
12 months or longer
 
Total
  
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
US Agency
 
$
398
 
 
$
(2
) 
 
$
—
 
 
$
—
 
 
$
398
 
 
$
(2
) 
US Agency mortgage-backed
securities
 
 
49,918
 
 
 
(703
) 
 
 
1,576
 
 
 
(62
) 
 
 
51,494
 
 
 
(765
) 
Taxable municipal
 
 
13,301
 
 
 
(522
) 
 
 
—
 
 
 
—
 
 
 
13,301
 
 
 
(522
) 
Corporate bonds and other
securities
 
 
20,380
 
 
 
(570
) 
 
 
6,762
 
 
 
(237
) 
 
 
27,142
 
 
 
(807
) 
Total
 
$
83,997
 
 
$
(1,797
) 
 
$
8,338
 
 
$
(299
) 
 
$
92,335
 
 
$
(2,096
) 
Schedule of Contractual Maturities of Securities [Table Text Block]

Total investment securities:

 
 
 
 
 
 
September 30, 2017
  
 
Available for sale
 
Held to maturity
  
 
Cost Basis
 
Fair Value
 
Cost Basis
 
Fair Value
Within 1 year
 
$
1,400
 
 
$
1,399
 
 
$
2,000
 
 
$
1,975
 
After 1 year but within 5 years
 
 
11,706
 
 
 
11,718
 
 
 
1,551
 
 
 
1,533
 
After 5 years but within 10 years
 
 
45,805
 
 
 
45,999
 
 
 
14,562
 
 
 
14,639
 
After 10 years but within 15 years
 
 
27,738
 
 
 
27,609
 
 
 
14,924
 
 
 
14,824
 
Over 15 years
 
 
42,631
 
 
 
42,721
 
 
 
5,960
 
 
 
6,088
 
Total
 
$
129,280
 
 
$
129,446
 
 
$
38,997
 
 
$
39,059