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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | $ | 38,529 |  |  | $ | 346 |  |  | $ | — |  |  | $ | 38,875 |
State and municipal | 859,511 |  |  | 41,092 |  |  | 807 |  |  | 899,796 |
U.S. Government-sponsored mortgage-backed securities | 842,349 |  |  | 10,378 |  |  | 1,404 |  |  | 851,323 |
Corporate obligations | 31 |  |  | — |  |  | — |  |  | 31 |
Total available for sale | 1,740,420 |  |  | 51,816 |  |  | 2,211 |  |  | 1,790,025 |
Held to maturity at December 31, 2019 |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | 15,619 |  |  | 1 |  |  | 37 |  |  | 15,583 |
State and municipal | 354,115 |  |  | 15,151 |  |  | 107 |  |  | 369,159 |
U.S. Government-sponsored mortgage-backed securities | 434,804 |  |  | 6,921 |  |  | 401 |  |  | 441,324 |
Foreign investment | 1,500 |  |  | — |  |  | — |  |  | 1,500 |
Total held to maturity | 806,038 |  |  | 22,073 |  |  | 545 |  |  | 827,566 |
Total Investment Securities | $ | 2,546,458 |  |  | $ | 73,889 |  |  | $ | 2,756 |  |  | $ | 2,617,591 |
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 |
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, 2019 and 2018:
| 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, 2019 |  |  |  |  |  |  |  |  |  |  |
State and municipal | $ | 76,273 |  |  | $ | 807 |  |  | $ | — |  |  | $ | — |  |  | $ | 76,273 |  |  | $ | 807 |
U.S. Government-sponsored mortgage-backed securities | 127,673 |  |  | 1,326 |  |  | 20,796 |  |  | 78 |  |  | 148,469 |  |  | 1,404 |
Total Temporarily Impaired Available for Sale Securities | 203,946 |  |  | 2,133 |  |  | 20,796 |  |  | 78 |  |  | 224,742 |  |  | 2,211 |
Temporarily Impaired Held to Maturity Securities at December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored agency securities | 3,016 |  |  | 4 |  |  | 12,467 |  |  | 33 |  |  | 15,483 |  |  | 37 |
State and municipal | 22,947 |  |  | 107 |  |  | — |  |  | — |  |  | 22,947 |  |  | 107 |
U.S. Government-sponsored mortgage-backed securities | 124,253 |  |  | 364 |  |  | 7,991 |  |  | 37 |  |  | 132,244 |  |  | 401 |
Total Temporarily Impaired Held to Maturity Securities | 150,216 |  |  | 475 |  |  | 20,458 |  |  | 70 |  |  | $ | 170,674 |  |  | 545 |
Total Temporarily Impaired Investment Securities | $ | 354,162 |  |  | $ | 2,608 |  |  | $ | 41,254 |  |  | $ | 148 |  |  | $ | 395,416 |  |  | $ | 2,756 |
| 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 |
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, 2019 |  |  |  |  |  |  |
Due in one year or less | $ | 1,134 |  |  | $ | 1,136 |  |  | $ | 9,920 |  |  | $ | 10,105 |
Due after one through five years | 5,031 |  |  | 5,141 |  |  | 45,197 |  |  | 45,654 |
Due after five through ten years | 74,745 |  |  | 76,920 |  |  | 84,153 |  |  | 88,844 |
Due after ten years | 817,161 |  |  | 855,505 |  |  | 231,964 |  |  | 241,639 |
| 898,071 |  |  | 938,702 |  |  | 371,234 |  |  | 386,242 |
U.S. Government-sponsored mortgage-backed securities | 842,349 |  |  | 851,323 |  |  | 434,804 |  |  | 441,324 |
Total Investment Securities | $ | 1,740,420 |  |  | $ | 1,790,025 |  |  | $ | 806,038 |  |  | $ | 827,566 |
Schedule of Gross Gains on Sales and Redemptions of Available for Sale Securities | Gross gains and losses on the sales and redemptions of available for sale securities for the for the years indicated are shown below.
| 2019 |  | 2018 |  | 2017
Sales and Redemptions of Available for Sale Securities: |  |  |  |  |
Gross gains | $ | 4,415 |  |  | $ | 4,269 |  |  | $ | 2,681 |
Gross losses | — |  |  | — |  |  | 50 |

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