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Investment Securities Held to Maturity (Tables) | 12 Months Ended
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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 | )

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