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Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of available-for-sale securities | The following table summarizes available-for-sale securities held by the Company at September 30, 2019:
| Available-for-Sale Securities
September 30, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(In thousands) |  |  |  |  |  |  |
U.S. Treasuries | $ | 1,356 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 1,356 |
Obligations of U.S. Government sponsored entities | 314,740 |  |  | 2,039 |  |  | 63 |  |  | 316,716 |
Obligations of U.S. states and political subdivisions | 84,744 |  |  | 1,152 |  |  | 60 |  |  | 85,836 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |
U.S. Government agencies | 176,737 |  |  | 1,429 |  |  | 1,319 |  |  | 176,847 |
U.S. Government sponsored entities | 560,009 |  |  | 2,920 |  |  | 3,664 |  |  | 559,265 |
U.S. corporate debt securities | 2,500 |  |  | 0 |  |  | 68 |  |  | 2,432 |
Total available-for-sale securities | $ | 1,140,086 |  |  | $ | 7,540 |  |  | $ | 5,174 |  |  | $ | 1,142,452 |
The following table summarizes available-for-sale securities held by the Company at December 31, 2018:
| Available-for-Sale Securities
December 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(In thousands) |  |  |  |  |  |  |
U.S. Treasuries | $ | 289 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 289 |
Obligations of U.S. Government sponsored entities | 493,371 |  |  | 80 |  |  | 7,553 |  |  | 485,898 |
Obligations of U.S. states and political subdivisions | 86,260 |  |  | 113 |  |  | 933 |  |  | 85,440 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |
U.S. Government agencies | 131,831 |  |  | 168 |  |  | 3,732 |  |  | 128,267 |
U.S. Government sponsored entities | 649,620 |  |  | 537 |  |  | 19,599 |  |  | 630,558 |
Non-U.S. Government agencies or sponsored entities | 31 |  |  | 0 |  |  | 0 |  |  | 31 |
U.S. corporate debt securities | 2,500 |  |  | 0 |  |  | 325 |  |  | 2,175 |
Total available-for-sale securities | $ | 1,363,902 |  |  | $ | 898 |  |  | $ | 32,142 |  |  | $ | 1,332,658 |
Schedule of held-to-maturity securities | The following table summarizes held-to-maturity securities held by the Company at September 30, 2019:
| Held-to-Maturity Securities
September 30, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(In thousands) |  |  |  |  |  |  |
Obligations of U.S. Government sponsored entities | $ | 131,001 |  |  | $ | 3,882 |  |  | $ | 0 |  |  | $ | 134,883 |
Obligations of U.S. states and political subdivisions | 7,656 |  |  | 44 |  |  | 0 |  |  | 7,700 |
Total held-to-maturity debt securities | $ | 138,657 |  |  | $ | 3,926 |  |  | $ | 0 |  |  | $ | 142,583 |
The following table summarizes held-to-maturity securities held by the Company at December 31, 2018:
| Held-to-Maturity Securities
December 31, 2018 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(In thousands) |  |  |  |  |  |  |
Obligations of U.S. Government sponsored entities | $ | 131,306 |  |  | $ | 0 |  |  | $ | 1,198 |  |  | $ | 130,108 |
Obligations of U.S. states and political subdivisions | 9,273 |  |  | 20 |  |  | 24 |  |  | 9,269 |
Total held-to-maturity debt securities | $ | 140,579 |  |  | $ | 20 |  |  | $ | 1,222 |  |  | $ | 139,377 |
Schedule of available-for-sale securities with unrealized losses | The following table summarizes available-for-sale securities that had unrealized losses at September 30, 2019:
| Less than 12 Months |  | 12 Months or Longer |  | Total
(In thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government sponsored entities | $ | 9,451 |  |  | $ | 49 |  |  | $ | 8,540 |  |  | $ | 14 |  |  | $ | 17,991 |  |  | $ | 63 |
Obligations of U.S. states and political subdivisions | 5,761 |  |  | 45 |  |  | 2,295 |  |  | 15 |  |  | 8,056 |  |  | 60 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | 57,136 |  |  | 336 |  |  | 49,624 |  |  | 983 |  |  | 106,760 |  |  | 1,319 |
U.S. Government sponsored entities | 42,056 |  |  | 276 |  |  | 296,532 |  |  | 3,388 |  |  | 338,588 |  |  | 3,664 |
U.S. corporate debt securities | 0 |  |  | 0 |  |  | 2,432 |  |  | 68 |  |  | 2,432 |  |  | 68 |
Total available-for-sale securities | $ | 114,404 |  |  | $ | 706 |  |  | $ | 359,423 |  |  | $ | 4,468 |  |  | $ | 473,827 |  |  | $ | 5,174 |
The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2018:
| Less than 12 Months |  | 12 Months or Longer |  | Total
(In thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government sponsored entities | $ | 21,660 |  |  | $ | 183 |  |  | $ | 449,141 |  |  | $ | 7,370 |  |  | $ | 470,801 |  |  | $ | 7,553 |
Obligations of U.S. states and political subdivisions | 11,971 |  |  | 19 |  |  | 49,756 |  |  | 914 |  |  | 61,727 |  |  | 933 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | 16,854 |  |  | 22 |  |  | 96,247 |  |  | 3,710 |  |  | 113,101 |  |  | 3,732 |
U.S. Government sponsored entities | 61,163 |  |  | 662 |  |  | 512,216 |  |  | 18,937 |  |  | 573,379 |  |  | 19,599 |
U.S. corporate debt securities | 0 |  |  | 0 |  |  | 2,175 |  |  | 325 |  |  | 2,175 |  |  | 325 |
Total available-for-sale securities | $ | 111,648 |  |  | $ | 886 |  |  | $ | 1,109,535 |  |  | $ | 31,256 |  |  | $ | 1,221,183 |  |  | $ | 32,142 |
Schedule held-to-maturity securities with unrealized losses | The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2018.
| Less than 12 Months |  | 12 Months or Longer |  | Total
(In thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government sponsored entities | $ | 4,980 |  |  | $ | 9 |  |  | $ | 125,128 |  |  | $ | 1,189 |  |  | $ | 130,108 |  |  | $ | 1,198 |
Obligations of U.S. states and political subdivisions | 8,127 |  |  | 24 |  |  | 0 |  |  | 0 |  |  | 8,127 |  |  | 24 |
Total held-to-maturity securities | $ | 13,107 |  |  | $ | 33 |  |  | $ | 125,128 |  |  | $ | 1,189 |  |  | $ | 138,235 |  |  | $ | 1,222 |
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity | The amortized cost and estimated fair value of debt securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-backed securities are shown separately since they are not due at a single maturity date.
September 30, 2019 |  |  |
(In thousands) | Amortized Cost |  | Fair Value
Available-for-sale securities: |  |  |
Due in one year or less | $ | 91,952 |  |  | $ | 92,005 |
Due after one year through five years | 225,410 |  |  | 227,476 |
Due after five years through ten years | 75,180 |  |  | 75,930 |
Due after ten years | 10,798 |  |  | 10,929 |
Total | 403,340 |  |  | 406,340 |
Mortgage-backed securities | 736,746 |  |  | 736,112 |
Total available-for-sale debt securities | $ | 1,140,086 |  |  | $ | 1,142,452 |
December 31, 2018 |  |  |
(In thousands) | Amortized Cost |  | Fair Value
Available-for-sale securities: |  |  |
Due in one year or less | $ | 78,160 |  |  | $ | 77,930 |
Due after one year through five years | 355,499 |  |  | 350,470 |
Due after five years through ten years | 139,560 |  |  | 136,734 |
Due after ten years | 9,201 |  |  | 8,668 |
Total | 582,420 |  |  | 573,802 |
Mortgage-backed securities | 781,482 |  |  | 758,856 |
Total available-for-sale debt securities | $ | 1,363,902 |  |  | $ | 1,332,658 |
September 30, 2019 |  |  |
(In thousands) | Amortized Cost |  | Fair Value
Held-to-maturity securities: |  |  |
Due in one year or less | $ | 17,696 |  |  | $ | 17,744 |
Due after one year through five years | 95,979 |  |  | 98,494 |
Due after five years through ten years | 24,982 |  |  | 26,345 |
Total held-to-maturity debt securities | $ | 138,657 |  |  | $ | 142,583 |
December 31, 2018 |  |  |
(In thousands) | Amortized Cost |  | Fair Value
Held-to-maturity securities: |  |  |
Due in one year or less | $ | 8,850 |  |  | $ | 8,832 |
Due after one year through five years | 86,520 |  |  | 85,645 |
Due after five years through ten years | 45,209 |  |  | 44,900 |
Total held-to-maturity debt securities | $ | 140,579 |  |  | $ | 139,377 |

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