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Securities (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 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 |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 6,561 |  |  | $ | 0 |  |  | $ | (178 | ) |  | $ | 6,383 |
State and political subdivisions |  | 205,352 |  |  |  | 707 |  |  |  | (4,784 | ) |  |  | 201,275 |
Corporate bonds |  | 1,207 |  |  |  | 0 |  |  |  | (24 | ) |  |  | 1,183 |
Mortgage-backed securities - residential |  | 154,726 |  |  |  | 19 |  |  |  | (7,318 | ) |  |  | 147,427 |
Collateralized mortgage obligations - residential |  | 22,498 |  |  |  | 0 |  |  |  | (1,197 | ) |  |  | 21,301 |
Small Business Administration |  | 13,145 |  |  |  | 0 |  |  |  | (718 | ) |  |  | 12,427 |
Totals | $ | 403,489 |  |  | $ | 726 |  |  | $ | (14,219 | ) |  | $ | 389,996 |
|  |  |  |  | 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.
|  | September 30, 2018 |
(In Thousands of Dollars) |  | Amortized Cost |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |
Within one year |  | $ | 10,619 |  |  | $ | 10,621 |
One to five years |  |  | 41,968 |  |  |  | 41,478 |
Five to ten years |  |  | 140,200 |  |  |  | 137,491 |
Beyond ten years |  |  | 20,333 |  |  |  | 19,251 |
Mortgage-backed, collateralized mortgage obligations and Small Business Administration securities |  |  | 190,369 |  |  |  | 181,155 |
Total |  | $ | 403,489 |  |  | $ | 389,996 |
Available for Sale Investment Securities with Unrealized Losses | The following table summarizes the available-for-sale investment securities with unrealized losses at September 30, 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 |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government sponsored entities | $ | 1,574 |  |  | $ | (18 | ) |  | $ | 4,809 |  |  | $ | (160 | ) |  | $ | 6,383 |  |  | $ | (178 | )
State and political subdivisions |  | 99,196 |  |  |  | (2,979 | ) |  |  | 30,670 |  |  |  | (1,805 | ) |  |  | 129,866 |  |  |  | (4,784 | )
Corporate bonds |  | 614 |  |  |  | (8 | ) |  |  | 568 |  |  |  | (16 | ) |  |  | 1,182 |  |  |  | (24 | )
Mortgage-backed securities - residential |  | 74,571 |  |  |  | (2,625 | ) |  |  | 72,043 |  |  |  | (4,693 | ) |  |  | 146,614 |  |  |  | (7,318 | )
Collateralized mortgage obligations - residential |  | 4,915 |  |  |  | (103 | ) |  |  | 14,385 |  |  |  | (1,094 | ) |  |  | 19,300 |  |  |  | (1,197 | )
Small Business Administration |  | 4 |  |  |  | 0 |  |  |  | 12,412 |  |  |  | (718 | ) |  |  | 12,416 |  |  |  | (718 | )
Total | $ | 180,874 |  |  | $ | (5,733 | ) |  | $ | 134,887 |  |  | $ | (8,486 | ) |  | $ | 315,761 |  |  | $ | (14,219 | )
| 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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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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