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Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of available for sale, debt securities | The following tables summarize available-for-sale securities held by the Company at December 31, 2018 and 2017:
| 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 available for sale securities |
| Available-for-Sale Securities
December 31, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |
Obligations of U.S. Government sponsored entities | $ | 507,248 |  |  | $ | 278 |  |  | $ | 3,333 |  |  | $ | 504,193 |
Obligations of U.S. states and political subdivisions | 91,659 |  |  | 281 |  |  | 421 |  |  | 91,519 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |
U.S. Government agencies | 139,747 |  |  | 659 |  |  | 2,671 |  |  | 137,735 |
U.S. Government sponsored entities | 667,767 |  |  | 1,045 |  |  | 12,634 |  |  | 656,178 |
Non-U.S. Government agencies or sponsored entities | 75 |  |  | 0 |  |  | 0 |  |  | 75 |
U.S. corporate debt securities | 2,500 |  |  | 0 |  |  | 338 |  |  | 2,162 |
Total debt securities | 1,408,996 |  |  | 2,263 |  |  | 19,397 |  |  | 1,391,862 |
Equity securities | 1,000 |  |  | 0 |  |  | 87 |  |  | 913 |
Total available-for-sale securities | $ | 1,409,996 |  |  | $ | 2,263 |  |  | $ | 19,484 |  |  | $ | 1,392,775 |
Schedule of held to maturity securities | The following tables summarize held-to-maturity securities held by the Company at December 31, 2018 and 2017:
| 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 |
Held-to-Maturity Securities
| Held-to-Maturity Securities
December 31, 2017 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(in thousands) |  |  |  |  |  |  |
Obligations of U.S. Government sponsored entities | $ | 131,707 |  |  | $ | 1,103 |  |  | $ | 90 |  |  | $ | 132,720 |
Obligations of U.S. states and political subdivisions | 7,509 |  |  | 93 |  |  | 7 |  |  | 7,595 |
Total held-to-maturity debt securities | $ | 139,216 |  |  | $ | 1,196 |  |  | $ | 97 |  |  | $ | 140,315 |
Schedule of debt securities, available for sale with unrealized losses | The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2018:
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale 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 | $ | 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 of available for sale securities with unrealized losses | The following table summarizes available-for-sale securities that had unrealized losses at December 31, 2017:
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Available-for-Sale 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 | $ | 319,545 |  |  | $ | 2,301 |  |  | $ | 39,791 |  |  | $ | 1,032 |  |  | $ | 359,336 |  |  | $ | 3,333 |
Obligations of U.S. states and political subdivisions | 39,571 |  |  | 219 |  |  | 11,729 |  |  | 202 |  |  | 51,300 |  |  | 421 |
Mortgage-backed securities – residential, issued by |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies | 33,056 |  |  | 452 |  |  | 86,562 |  |  | 2,219 |  |  | 119,618 |  |  | 2,671 |
U.S. Government sponsored entities | 208,524 |  |  | 1,941 |  |  | 410,767 |  |  | 10,693 |  |  | 619,291 |  |  | 12,634 |
U.S. corporate debt securities | 0 |  |  | 0 |  |  | 2,163 |  |  | 338 |  |  | 2,163 |  |  | 338 |
Equity securities | 0 |  |  | 0 |  |  | 913 |  |  | 87 |  |  | 913 |  |  | 87 |
Total available-for-sale securities | $ | 600,696 |  |  | $ | 4,913 |  |  | $ | 551,925 |  |  | $ | 14,571 |  |  | $ | 1,152,621 |  |  | $ | 19,484 |
Schedule held-to-maturity securities with unrealized losses | The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2017:
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
Obligations of U.S. Government sponsored entities | $ | 20,505 |  |  | $ | 90 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 20,505 |  |  | $ | 90 |
Obligations of U.S. sponsored entities | 5,094 |  |  | 7 |  |  | 0 |  |  | 0 |  |  | 5,094 |  |  | 7 |
Total held-to-maturity securities | $ | 25,599 |  |  | $ | 97 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 25,599 |  |  | $ | 97 |
The following table summarizes held-to-maturity securities that had unrealized losses at December 31, 2018:
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
Obligations of U.S. Government sponsored entities | $ | 4,980 |  |  | $ | 9 |  |  | $ | 125,128 |  |  | $ | 1,189 |  |  | $ | 130,108 |  |  | $ | 1,198 |
Obligations of U.S. sponsored entities | 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.
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 |
December 31, 2017 |  |  |
(in thousands) | Amortized Cost |  | Fair Value
Available-for-sale securities: |  |  |
Due in one year or less | $ | 51,909 |  |  | $ | 51,932 |
Due after one year through five years | 368,846 |  |  | 367,377 |
Due after five years through ten years | 162,061 |  |  | 160,374 |
Due after ten years | 18,591 |  |  | 18,191 |
Total | 601,407 |  |  | 597,874 |
Mortgage-backed securities | 807,589 |  |  | 793,988 |
Total available-for-sale debt securities | $ | 1,408,996 |  |  | $ | 1,391,862 |
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 |
Due after ten years | 0 |  |  | 0 |
Total held-to-maturity debt securities | $ | 140,579 |  |  | $ | 139,377 |
December 31, 2017 |  |  |
(in thousands) | Amortized Cost |  | Fair Value
Held-to-maturity securities: |  |  |
Due in one year or less | $ | 5,980 |  |  | $ | 5,979 |
Due after one year through five years | 51,936 |  |  | 52,227 |
Due after five years through ten years | 81,300 |  |  | 82,109 |
Due after ten years | 0 |  |  | 0 |
Total held-to-maturity debt securities | $ | 139,216 |  |  | $ | 140,315 |
Schedule of Realized Gain (Loss) [Table Text Block] | The following table sets forth information with regard to sales transactions of securities available-for-sale:
| Year ended December 31,
(in thousands) | 2018 |  | 2017 |  | 2016
Proceeds from sales | $ | 70,652 |  |  | $ | 64,106 |  |  | $ | 97,296 |
Gross realized gains | 327 |  |  | 19 |  |  | 894 |
Gross realized losses | (767 | ) |  | (426 | ) |  | 0 |
Net (losses) gains on sales of available-for-sale securities | $ | (440 | ) |  | $ | (407 | ) |  | $ | 894 |

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