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Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of available-for-sale securities | The following tables summarize available-for-sale debt securities held by the Company at December 31, 2021 and 2020:
December 31, 2021 | Available-for-Sale Debt Securities
(In thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
U.S. Treasuries | $ | 160,291 |  | $ | 85 |  | $ | 2,542 |  | $ | 157,834 |
Obligations of U.S. Government sponsored entities | 843,218 |  | 4,527 |  | 15,372 |  | 832,373 |
Obligations of U.S. states and political subdivisions | 102,177 |  | 2,092 |  | 100 |  | 104,169 |
Mortgage-backed securities – residential, issued by |  |  |  |
U.S. Government agencies | 76,502 |  | 1,187 |  | 532 |  | 77,157 |
U.S. Government sponsored entities | 879,102 |  | 5,735 |  | 14,281 |  | 870,556 |
U.S. corporate debt securities | 2,500 |  | 0 |  | 76 |  | 2,424 |
Total available-for-sale debt securities | $ | 2,063,790 |  | $ | 13,626 |  | $ | 32,903 |  | $ | 2,044,513 |
December 31, 2020 | Available-for-Sale Debt Securities
(In thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
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 |
December 31, 2021 | Held-to-Maturity Securities
(In thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
U.S. Treasuries | $ | 86,689 |  | $ | 279 |  | $ | 600 |  | $ | 86,368 |
Obligations of U.S. Government sponsored entities | 197,320 |  | 389 |  | 1,789 |  | 195,920 |
Total held-to-maturity debt securities | $ | 284,009 |  | $ | 668 |  | $ | 2,389 |  | $ | 282,288 |
December 31, 2021 |  |
(In thousands) | Amortized Cost | Fair Value
Held-to-maturity securities: |  |
Due after five years through ten years | 284,009 |  | 282,288 |
Total held-to-maturity debt securities | $ | 284,009 |  | $ | 282,288 |
Schedule of sales transactions of available-for-sale securities | The following table sets forth information with regard to sales transactions of debt securities available-for-sale:
| Year ended December 31,
(In thousands) | 2021 | 2020 | 2019
Proceeds from sales | $ | 142,679 |  | $ | 42,333 |  | $ | 232,598 |
Gross realized gains | 1,126 |  | 179 |  | 1,123 |
Gross realized losses | (851) |  | 0 |  | (595) |
Net gains (losses) on sales of available-for-sale debt securities | $ | 275 |  | $ | 179 |  | $ | 528 |
Schedule of debt securities, available for sale with unrealized losses | The following table summarizes available-for-sale debt securities that had unrealized losses at December 31, 2021:
December 31, 2021 | Available-for-Sale Debt Securities
| 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 | $ | 147,810 |  | $ | 2,542 |  | $ | 0 |  | $ | 0 |  | $ | 147,810 |  | $ | 2,542 |
Obligations of U.S. Government sponsored entities | 362,895 |  | $ | 6,694 |  | $ | 289,210 |  | $ | 8,678 |  | $ | 652,105 |  | $ | 15,372 |
Obligations of U.S. states and political subdivisions | 9,700 |  | 85 |  | 1,283 |  | 15 |  | 10,983 |  | 100 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |
U.S. Government agencies | 22,074 |  | 160 |  | 16,846 |  | 372 |  | 38,920 |  | 532 |
U.S. Government sponsored entities | 553,351 |  | 11,440 |  | 84,537 |  | 2,841 |  | 637,888 |  | 14,281 |
U.S. corporate debt securities | 0 |  | 0 |  | 2,424 |  | 76 |  | 2,424 |  | 76 |
Total available-for-sale debt securities | $ | 1,095,830 |  | $ | 20,921 |  | $ | 394,300 |  | $ | 11,982 |  | $ | 1,490,130 |  | $ | 32,903 |
The following table summarizes available-for-sale debt securities that had unrealized losses at December 31, 2020:
December 31, 2020 | Available-for-Sale Debt Securities
| 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 December 31, 2021:
December 31, 2021 | Held-to-Maturity Securities
| 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 | $ | 35,280 |  | $ | 600 |  | $ | 0 |  | $ | 0 |  | $ | 35,280 |  | $ | 600 |
Obligations of U.S. Government sponsored entities | 84,592 |  | 1,789 |  | 0 |  | 0 |  | 84,592 |  | 1,789 |
Total held-to-maturity securities | $ | 119,872 |  | $ | 2,389 |  | $ | 0 |  | $ | 0 |  | $ | 119,872 |  | $ | 2,389 |
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity |
December 31, 2021 |  |
(In thousands) | Amortized Cost | Fair Value
Available-for-sale debt securities: |  |
Due in one year or less | $ | 77,159 |  | $ | 77,892 |
Due after one year through five years | 474,537 |  | 471,776 |
Due after five years through ten years | 501,748 |  | 492,573 |
Due after ten years | 54,742 |  | 54,559 |
Total | 1,108,186 |  | 1,096,800 |
Mortgage-backed securities | 955,604 |  | 947,713 |
Total available-for-sale debt securities | $ | 2,063,790 |  | $ | 2,044,513 |
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 |

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