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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized cost and related market value of investment securities available-for-sale |
Investment Portfolio Composition. The amortized cost and related market value of investment securities available-for-sale and
held-to-maturity were as follows:
| June 30, 2018 |  |  | December 31, 2017
| Amortized | Unrealized | Unrealized | Market | Amortized | Unrealized | Unrealized | Market
| Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gain |  | Losses |  | Value
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury | $ | 262,471 |  | $ | 12 |  | $ | 3,745 |  | $ | 258,738 |  | $ | 237,505 |  | $ | - |  | $ | 2,164 |  | $ | 235,341
U.S. Government Agency |  | 159,906 |  |  | 656 |  |  | 653 |  |  | 159,909 |  |  | 144,324 |  |  | 727 |  |  | 407 |  |  | 144,644
States and Political Subdivisions |  | 66,348 |  |  | 1 |  |  | 218 |  |  | 66,131 |  |  | 91,533 |  |  | 2 |  |  | 378 |  |  | 91,157
Mortgage-Backed Securities |  | 940 |  |  | 58 |  |  | - |  |  | 998 |  |  | 1,102 |  |  | 83 |  |  | - |  |  | 1,185
Equity Securities(1) |  | 7,886 |  |  | - |  |  | - |  |  | 7,886 |  |  | 8,584 |  |  | - |  |  | - |  |  | 8,584
Total | $ | 497,551 |  | $ | 727 |  | $ | 4,616 |  | $ | 493,662 |  | $ | 483,048 |  | $ | 812 |  | $ | 2,949 |  | $ | 480,911
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury | $ | 50,124 |  | $ | - |  | $ | 668 |  | $ | 49,456 |  | $ | 98,256 |  | $ | - |  | $ | 441 |  | $ | 97,815
States and Political Subdivisions |  | 6,621 |  |  | - |  |  | 32 |  |  | 6,589 |  |  | 6,996 |  |  | - |  |  | 41 |  |  | 6,955
Mortgage-Backed Securities |  | 180,019 |  |  | 165 |  |  | 3,050 |  |  | 177,134 |  |  | 111,427 |  |  | 22 |  |  | 1,212 |  |  | 110,237
Total | $ | 236,764 |  | $ | 165 |  | $ | 3,750 |  | $ | 233,179 |  | $ | 216,679 |  | $ | 22 |  | $ | 1,694 |  | $ | 215,007
Total Investment Securities | $ | 734,315 |  | $ | 892 |  | $ | 8,366 |  | $ | 726,841 |  | $ | 699,727 |  | $ | 834 |  | $ | 4,643 |  | $ | 695,918
Schedule of investment securities with maturity distribution based on contractual maturities |
| Available for Sale |  | Held to Maturity
(Dollars in Thousands) | Amortized Cost |  | Market Value |  | Amortized Cost |  | Market Value
Due in one year or less | $ | 92,474 |  | $ | 92,106 |  | $ | 16,635 |  | $ | 16,617
Due after one year through five years |  | 264,809 |  |  | 260,934 |  |  | 40,110 |  |  | 39,428
Mortgage-Backed Securities |  | 940 |  |  | 998 |  |  | 180,019 |  |  | 177,134
U.S. Government Agency |  | 131,442 |  |  | 131,738 |  |  | - |  |  | -
Equity Securities |  | 7,886 |  |  | 7,886 |  |  | - |  |  | -
Total | $ | 497,551 |  | $ | 493,662 |  | $ | 236,764 |  | $ | 233,179
Schedule of investment securities with continuous unrealized loss position |
| Less Than |  | Greater Than |  |  |  |  |  |
| 12 Months |  | 12 Months |  | Total
| Market |  | Unrealized |  | Market |  | Unrealized |  | Market |  | Unrealized
(Dollars in Thousands) | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury | $ | 146,449 |  | $ | 2,127 |  | $ | 97,386 |  | $ | 1,618 |  | $ | 243,835 |  | $ | 3,745
U.S. Government Agency |  | 67,628 |  |  | 377 |  |  | 25,212 |  |  | 276 |  |  | 92,840 |  |  | 653
States and Political Subdivisions |  | 54,511 |  |  | 176 |  |  | 5,079 |  |  | 42 |  |  | 59,590 |  |  | 218
Mortgage-Backed Securities |  | 2 |  |  | - |  |  | - |  |  | - |  |  | 2 |  |  | -
Total |  | 268,590 |  |  | 2,680 |  |  | 127,677 |  |  | 1,936 |  |  | 396,267 |  |  | 4,616
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury |  | 24,574 |  |  | 489 |  |  | 24,882 |  |  | 179 |  |  | 49,456 |  |  | 668
States and Political Subdivisions |  | 6,093 |  |  | 25 |  |  | 496 |  |  | 7 |  |  | 6,589 |  |  | 32
Mortgage-Backed Securities |  | 108,323 |  |  | 1,742 |  |  | 29,894 |  |  | 1,308 |  |  | 138,217 |  |  | 3,050
Total | $ | 138,990 |  | $ | 2,256 |  | $ | 55,272 |  | $ | 1,494 |  | $ | 194,262 |  | $ | 3,750
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury | $ | 155,443 |  | $ | 963 |  | $ | 79,900 |  | $ | 1,201 |  | $ | 235,343 |  | $ | 2,164
U.S. Government Agency |  | 45,737 |  |  | 150 |  |  | 25,757 |  |  | 257 |  |  | 71,494 |  |  | 407
States and Political Subdivisions |  | 82,999 |  |  | 320 |  |  | 5,549 |  |  | 58 |  |  | 88,548 |  |  | 378
Mortgage-Backed Securities |  | 2 |  |  | - |  |  | - |  |  | - |  |  | 2 |  |  | -
Total |  | 284,181 |  |  | 1,433 |  |  | 111,206 |  |  | 1,516 |  |  | 395,387 |  |  | 2,949
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Treasury |  | 77,861 |  |  | 298 |  |  | 14,939 |  |  | 143 |  |  | 92,800 |  |  | 441
States and Political Subdivisions |  | 6,955 |  |  | 41 |  |  | - |  |  | - |  |  | 6,955 |  |  | 41
Mortgage-Backed Securities |  | 56,030 |  |  | 469 |  |  | 30,216 |  |  | 743 |  |  | 86,246 |  |  | 1,212
Total | $ | 140,846 |  | $ | 808 |  | $ | 45,155 |  | $ | 886 |  | $ | 186,001 |  | $ | 1,694

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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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