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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Marketable Securities [Abstract] |
Summary of Investment Security Carrying and Fair Value | The carrying values and estimated fair values of investment securities at the periods indicated are presented below:
(In Thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2017 |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government sponsored entities |  | $209,745 |  |  |  | $63 |  |  |  | $708 |  |  |  | $209,100 |
Municipal securities | 17,266 |  |  | 128 |  |  | 28 |  |  | 17,366 |
Corporate bonds | 34,638 |  |  | 444 |  |  | — |  |  | 35,082 |
Collateralized loan obligations | 3,000 |  |  | 2 |  |  | — |  |  | 3,002 |
Preferred stock | 5,421 |  |  | 391 |  |  | 11 |  |  | 5,801 |
Total securities available for sale |  | $270,070 |  |  |  | $1,028 |  |  |  | $747 |  |  |  | $270,351 |
Securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $897 |  |  |  | $— |  |  |  | $1 |  |  |  | $896 |
Total securities held to maturity |  | $897 |  |  |  | $— |  |  |  | $1 |  |  |  | $896 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government sponsored entities |  | $264,267 |  |  |  | $150 |  |  |  | $1,056 |  |  |  | $263,361 |
Municipal securities | 18,184 |  |  | 26 |  |  | 53 |  |  | 18,157 |
U.S. Agency mortgage-backed securities | 2 |  |  | — |  |  | — |  |  | 2 |
Corporate bonds | 44,437 |  |  | 295 |  |  | — |  |  | 44,732 |
Preferred stock | 4,922 |  |  | 49 |  |  | 4 |  |  | 4,967 |
Total securities available for sale |  | $331,812 |  |  |  | $520 |  |  |  | $1,113 |  |  |  | $331,219 |
Securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $899 |  |  |  | $23 |  |  |  | $— |  |  |  | $922 |
Total securities held to maturity |  | $899 |  |  |  | $23 |  |  |  | $— |  |  |  | $922 |
Unrealized Gain (Loss) on Investments | Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2017 and December 31, 2016 were as follows:
| Less Than 12 Months | More Than 12 Months | Total
(In Thousands) | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses | Fair Value | Unrealized Losses
September 30, 2017: |  |  |  |  |  |
Securities Available for Sale |  |  |  |  |  |
U.S. Treasury and government sponsored entities |  | $74,192 |  |  | $157 |  |  | $92,878 |  |  | $551 |  |  | $167,070 |  |  | $708 |
Municipal Securities | 1,344 |  | 7 |  | 3,014 |  | 21 |  | 4,358 |  | 28 |
Preferred Stock | 1,030 |  | 11 |  | — |  | — |  | 1,030 |  | 11 |
Total |  | $76,566 |  |  | $175 |  |  | $95,892 |  |  | $572 |  |  | $172,458 |  |  | $747 |
Securities Held to Maturity |  |  |  |  |  |
Municipal Securities |  | $856 |  |  | $1 |  |  | $— |  |  | $— |  |  | $856 |  |  | $1 |
Total |  | $856 |  |  | $1 |  |  | $— |  |  | $— |  |  | $856 |  |  | $1 |
December 31, 2016: |  |  |  |  |  |
Securities Available for Sale |  |  |  |  |  |
U.S. Treasury and government sponsored entities |  | $180,638 |  |  | $1,051 |  |  | $489 |  |  | $5 |  |  | $181,127 |  |  | $1,056 |
Municipal Securities | 11,533 |  | 33 |  | 1,786 |  | 20 |  | 13,319 |  | 53 |
Preferred Stock | — |  | — |  | 1,038 |  | 4 |  | 1,038 |  | 4 |
Total |  | $192,171 |  |  | $1,084 |  |  | $3,313 |  |  | $29 |  |  | $195,484 |  |  | $1,113 |
Schedule of Amortized Cost and Fair Value by Contractual Maturity | The amortized cost and estimated fair values of debt securities and preferred stock at September 30, 2017, are distributed by contractual maturity as shown below. 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. Although preferred stock has no stated maturity, it is aggregated in the calculation of weighted average yields presented below in the category of investments that mature in ten years or more.
(In Thousands) | Amortized Cost |  | Fair Value |  | Weighted Average Yield
US Treasury and government sponsored entities |  |  |  |  |
Within 1 year |  | $103,060 |  |  |  | $102,929 |  |  | 1.03 | %
1-5 years | 106,685 |  |  | 106,171 |  |  | 1.33 | %
Total |  | $209,745 |  |  |  | $209,100 |  |  | 1.18 | %
Corporate bonds |  |  |  |  |
Within 1 year |  | $4,501 |  |  |  | $4,513 |  |  | 1.84 | %
1-5 years | 21,704 |  |  | 21,957 |  |  | 1.89 | %
5-10 years | 8,433 |  |  | 8,612 |  |  | 2.32 | %
Total |  | $34,638 |  |  |  | $35,082 |  |  | 1.99 | %
Collateralized loan obligations |  |  |  |  |
Over 10 years |  | $3,000 |  |  |  | $3,002 |  |  | 3.04 | %
Total |  | $3,000 |  |  |  | $3,002 |  |  | 3.04 | %
Preferred stock |  |  |  |  |
Over 10 years |  | $5,421 |  |  |  | $5,801 |  |  | 6.37 | %
Total |  | $5,421 |  |  |  | $5,801 |  |  | 6.37 | %
Municipal securities |  |  |  |  |
Within 1 year |  | $3,904 |  |  |  | $3,911 |  |  | 1.37 | %
1-5 years | 12,770 |  |  | 12,873 |  |  | 2.26 | %
5-10 years | 1,489 |  |  | 1,478 |  |  | 4.78 | %
Total |  | $18,163 |  |  |  | $18,262 |  |  | 2.27 | %
Schedule of Available-For-Sale Securities Proceeds, Gains, and Losses | The proceeds and resulting gains and losses, computed using specific identification, from sales of investment securities for the three and nine months ending September 30, 2017 and 2016, respectively, are as follows:
(In Thousands) | Proceeds |  | Gross Gains |  | Gross Losses
Three Months Ended September 30, 2017 |  |  |  |  |
Available for sale securities |  | $14,996 |  |  |  | $— |  |  |  | $3 |
Nine Months Ended September 30, 2017 |  |  |  |  |
Available for sale securities |  | $25,006 |  |  |  | $14 |  |  |  | $3 |
Nine Months Ended September 30, 2016 |  |  |  |  |
Available for sale securities |  | $5,785 |  |  |  | $12 |  |  |  | $23 |
Summary of Interest Income On Available-For-Sale Investment Securities | A summary of interest income for the nine months ending September 30, 2017 and 2016, on available for sale investment securities is as follows:
(In Thousands) | 2017 |  | 2016
US Treasury and government sponsored entities |  | $2,255 |  |  |  | $1,979 |
U.S. Agency mortgage-backed securities | — |  |  | 4 |
Other | 881 |  |  | 667 |
Total taxable interest income |  | $3,136 |  |  |  | $2,650 |
Municipal securities |  | $281 |  |  |  | $213 |
Total tax-exempt interest income |  | $281 |  |  |  | $213 |
Total |  | $3,417 |  |  |  | $2,863 |

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