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Investment Securities Held to Maturity (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Held to Maturity
Investment securities held to maturity at December 31, 2017 and 2016 are summarized as follows (in thousands):
 
2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations
$
4,308

 
—

 
(87
)
 
4,221

Mortgage-backed securities
382

 
14

 
—

 
396

State and municipal obligations
462,942

 
9,280

 
(1,738
)
 
470,484

Corporate obligations
10,020

 
1

 
(83
)
 
9,938

 
$
477,652

 
9,295

 
(1,908
)
 
485,039

 
 
2016
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations
$
4,306

 
2

 
(83
)
 
4,225

Mortgage-backed securities
893

 
31

 
—

 
924

State and municipal obligations
473,653

 
6,635

 
(5,436
)
 
474,852

Corporate obligations
9,331

 
7

 
(52
)
 
9,286

 
$
488,183

 
6,675

 
(5,571
)
 
489,287
Securities Held to Maturity by Contractual Maturity
The amortized cost and fair value of investment securities held to maturity at December 31, 2017 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
2017
 
Amortized
cost
 
Fair
value
Due in one year or less
$
7,123

 
7,147

Due after one year through five years
67,352

 
67,915

Due after five years through ten years
260,937

 
265,279

Due after ten years
141,858

 
144,302

 
$
477,270

 
484,643
Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment
The following table represents the Company’s disclosure on investment securities held to maturity with temporary impairment (in thousands):
 
December 31, 2017 Unrealized Losses
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
Agency obligations
$
3,821

 
(87
)
 
—

 
—

 
3,821

 
(87
)
State and municipal obligations
37,317

 
(295
)
 
49,488

 
(1,443
)
 
86,805

 
(1,738
)
Corporate obligations
9,662

 
(83
)
 
—

 


 
9,662

 
(83
)
 
$
50,800

 
(465
)
 
49,488

 
(1,443
)
 
100,288

 
(1,908
)
 
December 31, 2016 Unrealized Losses
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
Agency obligations
$
3,525

 
(83
)
 
—

 
—

 
3,525

 
(83
)
State and municipal obligations
172,152

 
(5,132
)
 
6,617

 
(304
)
 
178,769

 
(5,436
)
Corporate obligations
4,697

 
(52
)
 
—

 


 
4,697

 
(52
)
 
$
180,374

 
(5,267
)
 
6,617

 
(304
)
 
186,991

 
(5,571
)