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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Approximate Market Value of Securities | The amortized cost, gross unrealized gains, gross unrealized losses and approximate market value of the Corporation's investment securities at the dates indicated were:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale at December 31, 2018 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | $ | 13,493 |  |  | $ | 92 |  |  | $ | 3 |  |  | $ | 13,582 |
State and municipal | 605,994 |  |  | 5,995 |  |  | 5,854 |  |  | 606,135 |
U.S. Government-sponsored mortgage-backed securities | 530,209 |  |  | 634 |  |  | 8,396 |  |  | 522,447 |
Corporate obligations | 31 |  |  |  |  |  |  |  | 31 |
Total available for sale | 1,149,727 |  |  | 6,721 |  |  | 14,253 |  |  | 1,142,195 |
Held to maturity at December 31, 2018 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | 22,618 |  |  |  |  | 545 |  |  | 22,073 |
State and municipal | 197,909 |  |  | 2,858 |  |  | 872 |  |  | 199,895 |
U.S. Government-sponsored mortgage-backed securities | 268,860 |  |  | 713 |  |  | 3,323 |  |  | 266,250 |
Foreign investment | 1,000 |  |  |  |  |  | 1 |  |  | 999 |
Total held to maturity | 490,387 |  |  | 3,571 |  |  | 4,741 |  |  | 489,217 |
Total Investment Securities | $ | 1,640,114 |  |  | $ | 10,292 |  |  | $ | 18,994 |  |  | $ | 1,631,412 |
Available for sale at December 31, 2017 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities |  |  |  |  |  |  |  |  |  |
State and municipal | $ | 510,852 |  |  | $ | 16,932 |  |  | $ | 1,091 |  |  | $ | 526,693 |
U.S. Government-sponsored mortgage-backed securities | 473,325 |  |  | 964 |  |  | 3,423 |  |  | 470,866 |
Corporate obligations | 31 |  |  |  |  |  |  |  | 31 |
Equity securities | 2,357 |  |  |  |  |  |  | 2,357 |
Total available for sale | 986,565 |  |  | 17,896 |  |  | 4,514 |  |  | 999,947 |
Held to maturity at December 31, 2017 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | 22,618 |  |  |  |  |  | 435 |  |  | 22,183 |
State and municipal | 235,594 |  |  | 6,295 |  |  | 244 |  |  | 241,645 |
U.S. Government-sponsored mortgage-backed securities | 301,443 |  |  | 3,341 |  |  | 1,404 |  |  | 303,380 |
Foreign investment | 1,000 |  |  |  |  |  |  |  |  | 1,000 |
Total held to maturity | 560,655 |  |  | 9,636 |  |  | 2,083 |  |  | 568,208 |
Total Investment Securities | $ | 1,547,220 |  |  | $ | 27,532 |  |  | $ | 6,597 |  |  | $ | 1,568,155 |
Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position | The following table shows the Corporation’s gross unrealized losses and fair value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position at December 31, 2018 and 2017:
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | $ | 1,490 |  |  | $ | 3 |  |  |  |  |  |  | $ | 1,490 |  |  | $ | 3 |
State and municipal | 234,431 |  |  | 3,958 |  |  | $ | 38,028 |  |  | $ | 1,896 |  |  | 272,459 |  |  | 5,854 |
U.S. Government-sponsored mortgage-backed securities | 196,601 |  |  | 2,400 |  |  | 217,121 |  |  | 5,996 |  |  | 413,722 |  |  | 8,396 |
Total Temporarily Impaired Available for Sale Securities | 432,522 |  |  | 6,361 |  |  | 255,149 |  |  | 7,892 |  |  | 687,671 |  |  | 14,253 |
Temporarily Impaired Held to Maturity Securities at December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agency securities |  |  |  |  |  |  | 22,073 |  |  | 545 |  |  | 22,073 |  |  | 545 |
State and municipal | 14,952 |  |  | 369 |  |  | 16,786 |  |  | 503 |  |  | 31,738 |  |  | 872 |
U.S. Government-sponsored mortgage-backed securities | 102,828 |  |  | 876 |  |  | 87,268 |  |  | 2,447 |  |  | 190,096 |  |  | 3,323 |
Foreign investment |  |  |  |  | 999 |  |  | 1 |  |  | 999 |  |  | 1 |
Total Temporarily Impaired Held to Maturity Securities | 117,780 |  |  | 1,245 |  |  | 127,126 |  |  | 3,496 |  |  | $ | 244,906 |  |  | 4,741 |
Total Temporarily Impaired Investment Securities | $ | 550,302 |  |  | $ | 7,606 |  |  | $ | 382,275 |  |  | $ | 11,388 |  |  | $ | 932,577 |  |  | $ | 18,994 |
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Temporarily Impaired Available for Sale Securities at December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
State and municipal | $ | 13,296 |  |  | $ | 198 |  |  | $ | 35,324 |  |  | $ | 893 |  |  | $ | 48,620 |  |  | $ | 1,091 |
U.S. Government-sponsored mortgage-backed securities | 182,755 |  |  | 1,520 |  |  | 68,667 |  |  | 1,903 |  |  | 251,422 |  |  | 3,423 |
Total Temporarily Impaired Available for Sale Securities | 196,051 |  |  | 1,718 |  |  | 103,991 |  |  | 2,796 |  |  | 300,042 |  |  | 4,514 |
Temporarily Impaired Held to Maturity Securities at December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | 9,988 |  |  | 131 |  |  | 12,196 |  |  | 304 |  |  | 22,184 |  |  | 435 |
State and municipal | 2,430 |  |  | 36 |  |  | 15,805 |  |  | 208 |  |  | 18,235 |  |  | 244 |
U.S. Government-sponsored mortgage-backed securities | 62,508 |  |  | 485 |  |  | 43,078 |  |  | 919 |  |  | 105,586 |  |  | 1,404 |
Total Temporarily Impaired Held to Maturity Securities | 74,926 |  |  | 652 |  |  | 71,079 |  |  | 1,431 |  |  | 146,005 |  |  | 2,083 |
Total Temporarily Impaired Investment Securities | $ | 270,977 |  |  | $ | 2,370 |  |  | $ | 175,070 |  |  | $ | 4,227 |  |  | $ | 446,047 |  |  | $ | 6,597 |
Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity | Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Available for Sale |  | Held to Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Maturity Distribution at December 31, 2018 |  |  |  |  |  |  |
Due in one year or less | $ | 13,092 |  |  | $ | 13,144 |  |  | $ | 4,732 |  |  | $ | 4,730 |
Due after one through five years | 5,311 |  |  | 5,378 |  |  | 49,054 |  |  | 48,473 |
Due after five through ten years | 73,280 |  |  | 74,411 |  |  | 62,873 |  |  | 64,163 |
Due after ten years | 527,835 |  |  | 526,815 |  |  | 104,868 |  |  | 105,601 |
| 619,518 |  |  | 619,748 |  |  | 221,527 |  |  | 222,967 |
U.S. Government-sponsored mortgage-backed securities | 530,209 |  |  | 522,447 |  |  | 268,860 |  |  | 266,250 |
Total Investment Securities | $ | 1,149,727 |  |  | $ | 1,142,195 |  |  | $ | 490,387 |  |  | $ | 489,217 |

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