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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments [Table Text Block]

The following tables show the amortized cost, gross unrealized gains and losses, and fair value of investment securities, by investment security type as of September 30, 2017 and December 31, 2016.
 
September 30, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
Securities available for sale:
 
 
 
 
 
 
 
U.S. government agencies and corporations
$
2,500

 
$
—

 
$
(11
)
 
$
2,489

State and political subdivisions
133,300

 
1,442

 
(486
)
 
134,256

Collateralized mortgage obligations (1)
150,298

 
150

 
(1,081
)
 
149,367

Mortgage-backed securities (1)
54,622

 
288

 
(123
)
 
54,787

Asset-backed securities (2)
46,351

 
61

 
(139
)
 
46,273

Trust preferred securities
2,130

 
—

 
(430
)
 
1,700

Corporate notes
29,288

 
306

 
(92
)
 
29,502

 
$
418,489

 
$
2,247

 
$
(2,362
)
 
$
418,374

 
 
 
 
 
 
 
 
Securities held to maturity:
 
 
 
 
 
 
 
State and political subdivisions
$
45,597

 
$
807

 
$
(48
)
 
$
46,356

 
 

 
 

 
 

 
 

 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
(Losses)
 
Fair
Value
Securities available for sale:
 
 
 
 
 
 
 
U.S. government agencies and corporations
$
2,524

 
$
69

 
$
—

 
$
2,593

State and political subdivisions
64,551

 
376

 
(591
)
 
64,336

Collateralized mortgage obligations (1)
103,038

 
255

 
(1,343
)
 
101,950

Mortgage-backed securities (1)
80,614

 
341

 
(797
)
 
80,158

Trust preferred security
1,784

 
—

 
(534
)
 
1,250

Corporate notes
10,326

 
25

 
(1
)
 
10,350

 
$
262,837

 
$
1,066

 
$
(3,266
)
 
$
260,637

 
 
 
 
 
 
 
 
Securities held to maturity:
 
 
 
 
 
 
 
State and political subdivisions
$
48,386

 
$
70

 
$
(667
)
 
$
47,789

(1)
All collateralized mortgage obligations and mortgage-backed securities consist of residential mortgage pass-through securities guaranteed by FHLMC or FNMA, real estate mortgage investment conduits guaranteed by FNMA, FHLMC or GNMA, and commercial mortgage pass-through securities guaranteed by the SBA.
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and fair value of investment securities available for sale as of September 30, 2017, by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity.  Expected maturities may differ from contractual maturities for collateralized mortgage obligations, mortgage-backed securities and asset-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Therefore, collateralized mortgage obligations, mortgage-backed securities and asset-backed securities are not included in the maturity categories within the following maturity summary.
 
September 30, 2017
 
Amortized Cost
 
Fair Value
Due in one year or less
$
2,117

 
$
2,121

Due after one year through five years
5,633

 
5,660

Due after five years through ten years
43,213

 
43,819

Due after ten years
116,255

 
116,347

 
167,218

 
167,947

Collateralized mortgage obligations, mortgage-backed and asset-backed securities
251,271

 
250,427

 
$
418,489

 
$
418,374

The amortized cost and fair value of investment securities held to maturity as of September 30, 2017, by contractual maturity, are shown below.  Certain securities have call features that allow the issuer to call the securities prior to maturity.  
 
September 30, 2017
 
Amortized Cost
 
Fair Value
Due in one year or less
$
—

 
$
—

Due after one year through five years
1,595

 
1,600

Due after five years through ten years
24,936

 
25,364

Due after ten years
19,066

 
19,392

 
$
45,597

 
$
46,356
Schedule of Realized Gain (Loss) [Table Text Block]
The details of the sales of investment securities available for sale for the three and nine months ended September 30, 2017 and 2016 are summarized in the following table.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Proceeds from sales
$
21,204

 
$
—

 
$
74,224

 
$
1,544

Gross gains on sales
197

 
—

 
527

 
60

Gross losses on sales
—

 
—

 
104

 
—
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of September 30, 2017 and December 31, 2016.
 
September 30, 2017
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair
Value
 
Gross
Unrealized
(Losses)
 
Fair
Value
 
Gross
Unrealized
(Losses)
 
Fair
Value
 
Gross
Unrealized
(Losses)
Securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies and corporations
$
2,489

 
$
(11
)
 
$
—

 
$
—

 
$
2,489

 
$
(11
)
State and political subdivisions
54,004

 
(486
)
 
—

 
—

 
54,004

 
(486
)
Collateralized mortgage obligations
102,016

 
(830
)
 
18,001

 
(251
)
 
120,017

 
(1,081
)
Mortgage-backed securities
27,500

 
(123
)
 
—

 
—

 
27,500

 
(123
)
Asset-backed securities
20,217

 
(139
)
 
—

 
—

 
20,217

 
(139
)
Trust preferred securities
—

 
—

 
1,700

 
(430
)
 
1,700

 
(430
)
Corporate notes
7,410

 
(92
)
 
—

 
—

 
7,410

 
(92
)
 
$
213,636

 
$
(1,681
)
 
$
19,701

 
$
(681
)
 
$
233,337

 
$
(2,362
)
 
 

 
 

 
 

 
 

 
 

 
 

Securities held to maturity:
 
 
 
 
 
 
 
 
 
 
 
State and political subdivisions
$
1,658

 
$
(7
)
 
$
1,755

 
$
(41
)
 
$
3,413

 
$
(48
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair
Value
 
Gross
Unrealized
(Losses)
 
Fair
Value
 
Gross
Unrealized
(Losses)
 
Fair
Value
 
Gross
Unrealized
(Losses)
Securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
State and political subdivisions
$
34,903

 
$
(591
)
 
$
—

 
$
—

 
$
34,903

 
$
(591
)
Collateralized mortgage obligations
75,771

 
(1,255
)
 
2,538

 
(88
)
 
78,309

 
(1,343
)
Mortgage-backed securities
60,221

 
(797
)
 
—

 
—

 
60,221

 
(797
)
Trust preferred security
—

 
—

 
1,250

 
(534
)
 
1,250

 
(534
)
Corporate notes
1,499

 
(1
)
 
—

 
—

 
1,499

 
(1
)
 
$
172,394

 
$
(2,644
)
 
$
3,788

 
$
(622
)
 
$
176,182

 
$
(3,266
)
 
 
 
 
 
 
 
 
 
 
 
 
Securities held to maturity:
 
 
 
 
 
 
 
 
 
 
 
State and political subdivisions
$
32,976

 
$
(458
)
 
$
3,968

 
$
(209
)
 
$
36,944

 
$
(667
)