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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities and Held-to-maturity Securities Reconciliation
Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the table below:
 
December 31, 2016
December 31, 2015
 
Amortized

Fair

Gross Unrealized
Amortized

Fair

Gross Unrealized
(in thousands)
Cost

Value

Gains

(Losses)

Cost

Value

Gains

(Losses)

Held-to-maturity:
 
 
 
 
 
 
 
 
  Obligations of state and
  political subdivisions
$
30,856

$
31,544

$
694

$
(6
)
$
42,919

$
44,146

$
1,246

$
(19
)
  Corporate bonds
3,519

3,518

—

(1
)
15,072

15,098

42

(16
)
MBS pass-through securities issued by FHLMC and FNMA
10,063

10,035

126

(154
)
11,646

11,810

171

(7
)
Total held-to-maturity
44,438

45,097

820

(161
)
69,637

71,054

1,459

(42
)
Available-for-sale:
 
 
 
 
 
 
 
 
Securities of U.S. government agencies:
 
 
 
 
 
 
 
 
MBS pass-through securities issued by FHLMC and FNMA
193,998

190,566

145

(3,577
)
138,222

138,462

694

(454
)
CMOs issued by FNMA
13,790

13,772

91

(109
)
18,266

18,219

97

(144
)
CMOs issued by FHLMC
43,452

42,758

37

(731
)
22,889

22,932

82

(39
)
CMOs issued by GNMA
6,844

6,945

102

(1
)
10,326

10,480

169

(15
)
Debentures of government- sponsored agencies
35,486

35,403

7

(90
)
161,690

160,892

28

(826
)
Privately issued CMOs
419

419

1

(1
)
3,960

4,150

190

—

Obligations of state and
political subdivisions
79,306

77,701

135

(1,740
)
57,110

57,673

580

(17
)
Corporate bonds
4,959

5,016

57

—

4,947

4,979

43

(11
)
Total available-for-sale
378,254

372,580

575

(6,249
)
417,410

417,787

1,883

(1,506
)
Total investment securities
$
422,692

$
417,677

$
1,395

$
(6,410
)
$
487,047

$
488,841

$
3,342

$
(1,548
)
Investments Classified by Contractual Maturity Date
The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2016 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.
 
December 31, 2016
December 31, 2015
 
Held-to-Maturity
Available-for-Sale
Held-to-Maturity
Available-for-Sale
(in thousands)
Amortized Cost

Fair Value

Amortized Cost

Fair Value

Amortized Cost

Fair Value

Amortized Cost

Fair Value

Within one year
$
13,473

$
13,506

$
20,136

$
20,109

$
18,853

$
18,920

$
12,135

$
12,176

After one but within five years
16,706

17,150

58,334

58,267

31,677

32,360

188,007

187,326

After five years through ten years
3,000

3,125

113,576

110,842

8,580

8,969

64,899

64,999

After ten years
11,259

11,316

186,208

183,362

10,527

10,805

152,369

153,286

Total
$
44,438

$
45,097

$
378,254

$
372,580

$
69,637

$
71,054

$
417,410

$
417,787
Schedule of Unrealized Loss on Investments
Those securities are summarized and classified according to the duration of the loss period in the tables below:
December 31, 2016
< 12 continuous months
 
 
≥ 12 continuous months
 
 
Total securities
 in a loss position
 
(in thousands)
Fair value

Unrealized loss

 
Fair value

Unrealized loss

 
Fair value

Unrealized loss

Held-to-maturity:
 
 
 
 
 
 
 
 
MBS pass-through securities issued by FHLMC and FNMA
$
2,250

$
(154
)
 




 
$
2,250

$
(154
)
Obligations of state and political subdivisions
3,362

(6
)
 




 
3,362

(6
)
Corporate bonds
3,518

(1
)
 




 
3,518

(1
)
Total held-to-maturity
9,130

(161
)
 
—

—

 
9,130

(161
)
Available-for-sale:
 
 
 
 
 
 
 
 
MBS pass-through securities issued by FHLMC and FNMA
162,016

(3,577
)
 




 
162,016

(3,577
)
CMOs issued by FNMA
9,498

(109
)
 




 
9,498

(109
)
CMOs issued by FHLMC
31,545

(731
)
 




 
31,545

(731
)
CMOs issued by GNMA
1,583

(1
)
 




 
1,583

(1
)
Debentures of government- sponsored agencies
19,951

(38
)
 
9,946

(52
)
 
29,897

(90
)
Obligations of state and political subdivisions
59,567

(1,740
)
 




 
59,567

(1,740
)
Privately issued CMO's
154

(1
)
 




 
154

(1
)
Total available-for-sale
284,314

(6,197
)
 
9,946

(52
)
 
294,260

(6,249
)
Total temporarily impaired securities
$
293,444

$
(6,358
)
 
$
9,946

$
(52
)
 
$
303,390

$
(6,410
)
 
December 31, 2015
< 12 continuous months
 
 
> 12 continuous months
 
 
Total securities
 in a loss position
 
(in thousands)
Fair value

Unrealized loss

 
Fair value

Unrealized loss

 
Fair value

Unrealized loss

Held-to-maturity:
 
 
 
 
 
 
 
 
MBS pass-through securities issued by FHLMC and FNMA
$
2,332

$
(7
)
 
$
—

$
—

 
$
2,332

$
(7
)
Obligations of state and political subdivisions
8,297

(19
)
 
—

—

 
8,297

(19
)
Corporate bonds
3,523

(15
)
 
1,999

(1
)
 
5,522

(16
)
Total held-to-maturity
14,152

(41
)
 
1,999

(1
)
 
16,151

(42
)
Available-for-sale:
 
 
 
 
 
 
 
 
MBS pass-through securities issued by FHLMC and FNMA
68,809

(454
)
 
—

—

 
68,809

(454
)
CMOs issued by FNMA
9,277

(80
)
 
3,158

(64
)
 
12,435

(144
)
CMOs issued by FHLMC
—

—

 
1,989

(39
)
 
1,989

(39
)
CMOs issued by GNMA
164

—

 
2,374

(15
)
 
2,538

(15
)
Debentures of government- sponsored agencies
136,064

(713
)
 
9,887

(113
)
 
145,951

(826
)
Obligations of state and political subdivisions
4,557

(15
)
 
579

(2
)
 
5,136

(17
)
Corporate bonds
2,986

(11
)
 
—

—

 
2,986

(11
)
Total available-for-sale
221,857

(1,273
)
 
17,987

(233
)
 
239,844

(1,506
)
Total temporarily impaired securities
$
236,009

$
(1,314
)
 
$
19,986

$
(234
)
 
$
255,995

$
(1,548
)
Gain (Loss) on Investments [Table Text Block]
Sales of investment securities and gross gains and losses are shown in the following table. The sales of the held-to-maturity securities were due to evidence of significant deterioration of the issuers' creditworthiness since purchase.
(in thousands)
2016
2015
2014
Available-for-sale:
 
 
 
  Sales proceeds
$
68,673

$
2,099

$
2,436

  Gross realized gains
$
458

$
7

$
4

  Gross realized losses
$
(64
)
$
(1
)
$
(28
)
Held-to-maturity:
 
 
 
  Sales proceeds
$
1,265

$
1,015

$
2,146

  Gross realized gains
$
32

$
73

$
104

  Gross realized losses
$
—

$
—

$
—