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Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments Debt And Equity Securities [Abstract] |
Summary of the Amortized Cost and Fair Value of Available-for-Sale Investment Securities Corresponding Amounts of Unrealized Gains and Losses | The following table summarizes the amortized cost and fair value of the available-for-sale investment securities portfolio at March 31, 2018 and December 31, 2017 and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income:
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(In Thousands of Dollars) | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
| Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 6,166 |  |  | $ | 0 |  |  | $ | (137 | ) |  | $ | 6,029 |
State and political subdivisions |  | 191,491 |  |  |  | 1,728 |  |  |  | (3,185 | ) |  |  | 190,034 |
Corporate bonds |  | 1,184 |  |  |  | 0 |  |  |  | (23 | ) |  |  | 1,161 |
Mortgage-backed securities - residential |  | 162,503 |  |  |  | 37 |  |  |  | (5,244 | ) |  |  | 157,296 |
Collateralized mortgage obligations - residential |  | 17,151 |  |  |  | 0 |  |  |  | (1,018 | ) |  |  | 16,133 |
Small Business Administration |  | 14,249 |  |  |  | 0 |  |  |  | (506 | ) |  |  | 13,743 |
Totals | $ | 392,744 |  |  | $ | 1,765 |  |  | $ | (10,113 | ) |  | $ | 384,396 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(In Thousands of Dollars) | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
| Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 8,986 |  |  | $ | 0 |  |  | $ | (69 | ) |  | $ | 8,917 |
State and political subdivisions |  | 188,032 |  |  |  | 3,614 |  |  |  | (643 | ) |  |  | 191,003 |
Corporate bonds |  | 1,238 |  |  |  | 4 |  |  |  | (8 | ) |  |  | 1,234 |
Mortgage-backed securities - residential |  | 161,635 |  |  |  | 419 |  |  |  | (1,604 | ) |  |  | 160,450 |
Collateralized mortgage obligations - residential |  | 17,898 |  |  |  | 0 |  |  |  | (777 | ) |  |  | 17,121 |
Small Business Administration |  | 14,608 |  |  |  | 0 |  |  |  | (396 | ) |  |  | 14,212 |
Totals | $ | 392,397 |  |  | $ | 4,037 |  |  | $ | (3,497 | ) |  | $ | 392,937 |
Amortized Cost and Fair Value of the Debt Securities Maturity | The amortized cost and fair value of the debt securities portfolio are shown by expected maturity. Expected maturities may differ from contractual maturities if issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
|  | March 31, 2018 |
(In Thousands of Dollars) |  | Amortized Cost |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |
Within one year |  | $ | 11,302 |  |  | $ | 11,255 |
One to five years |  |  | 47,214 |  |  |  | 47,035 |
Five to ten years |  |  | 123,704 |  |  |  | 123,070 |
Beyond ten years |  |  | 16,621 |  |  |  | 15,864 |
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities |  |  | 193,903 |  |  |  | 187,172 |
Total |  | $ | 392,744 |  |  | $ | 384,396 |
Investment Securities with Unrealized Losses | The following table summarizes the investment securities with unrealized losses at March 31, 2018 and December 31, 2017, aggregated by major security type and length of time in a continuous unrealized loss position.
| Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
(In Thousands of Dollars) | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
| Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 4,175 |  |  | $ | (79 | ) |  | $ | 1,854 |  |  | $ | (58 | ) |  | $ | 6,029 |  |  | $ | (137 | )
State and political subdivisions |  | 70,499 |  |  |  | (2,019 | ) |  |  | 24,947 |  |  |  | (1,166 | ) |  |  | 95,446 |  |  |  | (3,185 | )
Corporate bonds |  | 784 |  |  |  | (12 | ) |  |  | 377 |  |  |  | (11 | ) |  |  | 1,161 |  |  |  | (23 | )
Mortgage-backed securities - residential |  | 104,615 |  |  |  | (2,671 | ) |  |  | 50,549 |  |  |  | (2,573 | ) |  |  | 155,164 |  |  |  | (5,244 | )
Collateralized mortgage obligations - residential |  | 1,609 |  |  |  | (37 | ) |  |  | 14,524 |  |  |  | (981 | ) |  |  | 16,133 |  |  |  | (1,018 | )
Small Business Administration |  | 0 |  |  |  | 0 |  |  |  | 13,716 |  |  |  | (506 | ) |  |  | 13,716 |  |  |  | (506 | )
Total | $ | 181,682 |  |  | $ | (4,818 | ) |  | $ | 105,967 |  |  | $ | (5,295 | ) |  | $ | 287,649 |  |  | $ | (10,113 | )
| Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
(In Thousands of Dollars) | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
| Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 3,970 |  |  | $ | (34 | ) |  | $ | 1,912 |  |  | $ | (35 | ) |  | $ | 5,882 |  |  | $ | (69 | )
State and political subdivisions |  | 33,188 |  |  |  | (220 | ) |  |  | 25,721 |  |  |  | (423 | ) |  |  | 58,909 |  |  |  | (643 | )
Corporate bonds |  | 397 |  |  |  | (3 | ) |  |  | 383 |  |  |  | (5 | ) |  |  | 780 |  |  |  | (8 | )
Mortgage-backed securities - residential |  | 40,072 |  |  |  | (400 | ) |  |  | 53,760 |  |  |  | (1,204 | ) |  |  | 93,832 |  |  |  | (1,604 | )
Collateralized mortgage obligations - residential |  | 1,701 |  |  |  | (22 | ) |  |  | 15,420 |  |  |  | (755 | ) |  |  | 17,121 |  |  |  | (777 | )
Small Business Administration |  | 0 |  |  |  | 0 |  |  |  | 14,182 |  |  |  | (396 | ) |  |  | 14,182 |  |  |  | (396 | )
Total | $ | 79,328 |  |  | $ | (679 | ) |  | $ | 111,378 |  |  | $ | (2,818 | ) |  | $ | 190,706 |  |  | $ | (3,497 | )

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