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Investment Securities Held to Maturity (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Held to Maturity
Investment securities held to maturity at December 31, 2015 and 2014 are summarized as follows (in thousands):
 
2015
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations
$
4,096

 
9

 
(8
)
 
4,097

Mortgage-backed securities
1,597

 
61

 
—

 
1,658

State and municipal obligations
458,062

 
15,094

 
(495
)
 
472,661

Corporate obligations
9,929

 
11

 
(25
)
 
9,915

 
$
473,684

 
15,175

 
(528
)
 
488,331

 
 
2014
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations
$
6,813

 
17

 
(20
)
 
6,810

Mortgage-backed securities
2,816

 
123

 
—

 
2,939

State and municipal obligations
449,410

 
13,814

 
(986
)
 
462,238

Corporate obligations
10,489

 
29

 
(32
)
 
10,486

 
$
469,528

 
13,983

 
(1,038
)
 
482,473
Securities Held to Maturity by Contractual Maturity
The amortized cost and fair value of investment securities held to maturity at December 31, 2015 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.
 
2015
 
Amortized
cost
 
Fair
value
Due in one year or less
$
9,081

 
9,151

Due after one year through five years
52,625

 
53,554

Due after five years through ten years
218,488

 
227,203

Due after ten years
191,893

 
196,765

 
$
472,087

 
486,673
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, 2015 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
$
1,244

 
(6
)
 
278

 
(2
)
 
1,522

 
(8
)
State and municipal obligations
24,266

 
(165
)
 
17,746

 
(330
)
 
42,012

 
(495
)
Corporate obligations
5,840

 
(18
)
 
744

 
(7
)
 
6,584

 
(25
)
 
$
31,350

 
(189
)
 
18,768

 
(339
)
 
50,118

 
(528
)
 
December 31, 2014 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
$
3,735

 
(20
)
 
—

 
—

 
3,735

 
(20
)
State and municipal obligations
27,679

 
(217
)
 
47,079

 
(769
)
 
74,758

 
(986
)
Corporate obligations
6,888

 
(32
)
 
—

 
—

 
6,888

 
(32
)
 
$
38,302

 
(269
)
 
47,079

 
(769
)
 
85,381

 
(1,038
)