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Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of available-for-sale securities | The following table summarizes available-for-sale debt securities held by the Company at September 30, 2021:
| Available-for-Sale Debt Securities
September 30, 2021 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
(In thousands) |  |  |  |
U.S. Treasuries | $ | 140,373 |  | $ | 2 |  | $ | 1,447 |  | $ | 138,928 |
Obligations of U.S. Government sponsored entities | 813,833 |  | 6,001 |  | 9,491 |  | 810,343 |
Obligations of U.S. states and political subdivisions | 107,912 |  | 2,144 |  | 145 |  | 109,911 |
Mortgage-backed securities – residential, issued by |  |  |  |
U.S. Government agencies | 88,135 |  | 1,607 |  | 422 |  | 89,320 |
U.S. Government sponsored entities | 919,745 |  | 8,267 |  | 12,008 |  | 916,004 |
U.S. corporate debt securities | 2,500 |  | 0 |  | 79 |  | 2,421 |
Total available-for-sale debt securities | $ | 2,072,498 |  | $ | 18,021 |  | $ | 23,592 |  | $ | 2,066,927 |
The following table summarizes available-for-sale debt securities held by the Company at December 31, 2020:
| Available-for-Sale Debt Securities
December 31, 2020 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
(In thousands) |  |  |  |
Obligations of U.S. Government sponsored entities | $ | 599,652 |  | $ | 9,820 |  | $ | 1,992 |  | $ | 607,480 |
Obligations of U.S. states and political subdivisions | 126,642 |  | 3,144 |  | 40 |  | 129,746 |
Mortgage-backed securities – residential, issued by |  |  |  |
U.S. Government agencies | 179,538 |  | 3,216 |  | 646 |  | 182,108 |
U.S. Government sponsored entities | 691,562 |  | 14,593 |  | 675 |  | 705,480 |
U.S. corporate debt securities | 2,500 |  | 0 |  | 121 |  | 2,379 |
Total available-for-sale debt securities | $ | 1,599,894 |  | $ | 30,773 |  | $ | 3,474 |  | $ | 1,627,193 |
Schedule of held-to-maturity securities | The following table summarizes held-to-maturity debt securities held by the Company at September 30, 2021:
| Held-to-Maturity Securities
September 30, 2021 | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
(In thousands) |  |  |  |
U.S. Treasuries | $ | 86,740 |  | $ | 321 |  | $ | 630 |  | $ | 86,431 |
Obligations of U.S. Government sponsored entities | 182,528 |  | 793 |  | 1,469 |  | 181,852 |
Total held-to-maturity debt securities | $ | 269,268 |  | $ | 1,114 |  | $ | 2,099 |  | $ | 268,283 |
Schedule of available-for-sale securities with unrealized losses | The following table summarizes available-for-sale debt securities that had unrealized losses at September 30, 2021, and December 31, 2020.
| Less than 12 Months | 12 Months or Longer | Total
(In thousands) | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses
U.S. Treasuries | $ | 137,935 |  | $ | 1,447 |  | $ | 0 |  | $ | 0 |  | $ | 137,935 |  | $ | 1,447 |
Obligations of U.S. Government sponsored entities | 326,852 |  | 3,879 |  | 276,710 |  | 5,612 |  | 603,562 |  | 9,491 |
Obligations of U.S. states and political subdivisions | 14,192 |  | 126 |  | 1,281 |  | 19 |  | 15,473 |  | 145 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |
U.S. Government agencies | 34,808 |  | 405 |  | 1,285 |  | 17 |  | 36,093 |  | 422 |
U.S. Government sponsored entities | 609,541 |  | 10,743 |  | 33,837 |  | 1,265 |  | 643,378 |  | 12,008 |
U.S. corporate debt securities | 0 |  | 0 |  | 2,421 |  | 79 |  | 2,421 |  | 79 |
Total available-for-sale debt securities | $ | 1,123,328 |  | $ | 16,600 |  | $ | 315,534 |  | $ | 6,992 |  | $ | 1,438,862 |  | $ | 23,592 |
| 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 | $ | 310,711 |  | $ | 1,992 |  | $ | 0 |  | $ | 0 |  | $ | 310,711 |  | $ | 1,992 |
Obligations of U.S. states and political subdivisions | 8,868 |  | 40 |  | 0 |  | 0 |  | 8,868 |  | 40 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |
U.S. Government agencies | 10,560 |  | 396 |  | 1,819 |  | 250 |  | 12,379 |  | 646 |
U.S. Government sponsored entities | 87,643 |  | 586 |  | 5,068 |  | 89 |  | 92,711 |  | 675 |
U.S. corporate debt securities | 0 |  | 0 |  | 2,379 |  | 121 |  | 2,379 |  | 121 |
Total available-for-sale debt securities | $ | 417,782 |  | $ | 3,014 |  | $ | 9,266 |  | $ | 460 |  | $ | 427,048 |  | $ | 3,474 |
Schedule held-to-maturity securities with unrealized losses | The following table summarizes held-to-maturity debt securities that had unrealized losses at September 30, 2021.
| Less than 12 Months | 12 Months or Longer | Total
(In thousands) | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses
U.S. Treasuries | $ | 35,277 |  | $ | 630 |  | $ | 0 |  | $ | 0 |  | $ | 35,277 |  | $ | 630 |
Obligations of U.S. Government sponsored entities | 79,986 |  | 1,469 |  | $ | 0 |  | $ | 0 |  | $ | 79,986 |  | 1,469 |
Total held-to-maturity debt securities | $ | 115,263 |  | $ | 2,099 |  | $ | 0 |  | $ | 0 |  | $ | 115,263 |  | $ | 2,099 |
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity |
September 30, 2021 |  |
(In thousands) | Amortized Cost | Fair Value
Available-for-sale debt securities: |  |
Due in one year or less | $ | 57,011 |  | $ | 57,604 |
Due after one year through five years | 463,136 |  | 465,980 |
Due after five years through ten years | 487,701 |  | 481,464 |
Due after ten years | 56,770 |  | 56,555 |
Total | 1,064,618 |  | 1,061,603 |
Mortgage-backed securities | 1,007,880 |  | 1,005,324 |
Total available-for-sale debt securities | $ | 2,072,498 |  | $ | 2,066,927 |
December 31, 2020 |  |
(In thousands) | Amortized Cost | Fair Value
Available-for-sale debt securities: |  |
Due in one year or less | $ | 54,484 |  | $ | 55,008 |
Due after one year through five years | 379,044 |  | 388,132 |
Due after five years through ten years | 228,572 |  | 229,107 |
Due after ten years | 66,694 |  | 67,358 |
Total | 728,794 |  | 739,605 |
Mortgage-backed securities | 871,100 |  | 887,588 |
Total available-for-sale debt securities | $ | 1,599,894 |  | $ | 1,627,193 |
September 30, 2021 |  |
(In thousands) | Amortized Cost | Fair Value
Held-to-maturity debt securities: |  |
Due after five years through ten years | $ | 269,268 |  | $ | 268,283 |
Total held-to-maturity debt securities | $ | 269,268 |  | $ | 268,283 |

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