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Investment in Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of debt and equity securities are summarized as follows:
|  | December 31, 2017
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |  |
(In thousands) |  | Cost |  | Gains |  | Losses |  | Fair Value
State and political subdivisions |  | $ | 408,165 |  | $ | 9,528 |  | $ | 661 |  | $ | 417,032
U.S. government agencies |  |  | 46,222 |  |  | — |  |  | 722 |  |  | 45,500
Certificates of deposit |  |  | 7,991 |  |  | — |  |  | — |  |  | 7,991
Total |  | $ | 462,378 |  | $ | 9,528 |  | $ | 1,383 |  | $ | 470,523
|  | December 31, 2016
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  |  |
(In thousands) |  | Cost |  | Gains |  | Losses |  | Fair Value
State and political subdivisions |  | $ | 368,223 |  | $ | 5,239 |  | $ | 3,328 |  | $ | 370,134
U.S. government agencies |  |  | 13,075 |  |  | — |  |  | 403 |  |  | 12,672
Certificates of deposit |  |  | 7,746 |  |  | — |  |  | — |  |  | 7,746
Total |  | $ | 389,044 |  | $ | 5,239 |  | $ | 3,731 |  | $ | 390,552
Schedule of Fair Value of Securities with Unrealized Losses | The fair values of securities with unrealized losses are as follows:
|  |  |  |  |  |  |  | December 31, 2017 |  |  |  |  |  |
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
(In thousands) |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair value |  | Losses
State and political subdivisions |  | $ | 34,755 |  | $ | 123 |  | $ | 31,251 |  | $ | 538 |  | $ | 66,006 |  | $ | 661
U.S. government agencies |  |  | 34,183 |  |  | 376 |  |  | 11,317 |  |  | 346 |  |  | 45,500 |  |  | 722
Certificates of deposit |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Total |  | $ | 68,938 |  | $ | 499 |  | $ | 42,568 |  | $ | 884 |  | $ | 111,506 |  | $ | 1,383
|  |  |  |  |  |  |  | December 31, 2016 |  |  |  |  |  |
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized
(In thousands) |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair value |  | Losses
State and political subdivisions |  | $ | 140,384 |  | $ | 3,328 |  | $ | — |  | $ | — |  | $ | 140,384 |  | $ | 3,328
U.S. government agencies |  |  | 12,672 |  |  | 403 |  |  | — |  |  | — |  |  | 12,672 |  |  | 403
Certificates of deposit |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Total |  | $ | 153,056 |  | $ | 3,731 |  | $ | — |  | $ | — |  | $ | 153,056 |  | $ | 3,731
Schedule of Amortized Cost and Fair Value | The amortized cost and fair value of debt and equity securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.
|  | December 31, 2017
(In thousands) |  | Amortized Cost |  | Fair Value
Due in 1 year or less |  | $ | 22,492 |  | $ | 22,638
Due after 1 year through 5 years |  |  | 57,922 |  |  | 58,425
Due after 5 years through 10 years |  |  | 256,396 |  |  | 263,961
Due after 10 years |  |  | 125,568 |  |  | 125,499
No stated maturity |  |  | — |  |  | —
Total |  | $ | 462,378 |  | $ | 470,523

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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