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INVESTMENT SECURITIES AVAILABLE FOR SALE (Tables) | 3 Months Ended
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Mar. 31, 2021
Investment Securities Available For Sale [Abstract] |
Schedule of Amortized Cost and Approximate Fair Value of Securities Available for Sale | A summary of amortized cost and approximate fair value of investment securities available for sale included in the Consolidated Statements of Condition as of March 31, 2021 and December 31, 2020 follows:
|  | March 31, 2021 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S government-sponsored agencies |  | $ | 229,199 |  |  | $ | — |  |  | $ | (7,862 | ) |  | $ | 221,337 |
Mortgage-backed securities–residential |  |  | 598,088 |  |  |  | 6,786 |  |  |  | (8,254 | ) |  |  | 596,620 |
SBA pool securities |  |  | 47,372 |  |  |  | 15 |  |  |  | (1,144 | ) |  |  | 46,243 |
State and political subdivisions |  |  | 7,967 |  |  |  | 86 |  |  |  | — |  |  |  | 8,053 |
Corporate bond |  |  | 3,000 |  |  |  | 48 |  |  |  | — |  |  |  | 3,048 |
Total |  | $ | 885,626 |  |  | $ | 6,935 |  |  | $ | (17,260 | ) |  | $ | 875,301 |
|  | December 31, 2020 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. treasuries |  | $ | 2,613 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,613 |
U.S. government-sponsored agencies |  |  | 84,424 |  |  |  | 2 |  |  |  | (655 | ) |  |  | 83,771 |
Mortgage-backed securities–residential |  |  | 467,915 |  |  |  | 8,604 |  |  |  | (461 | ) |  |  | 476,058 |
SBA pool securities |  |  | 49,457 |  |  |  | 31 |  |  |  | (359 | ) |  |  | 49,129 |
State and political subdivisions |  |  | 7,987 |  |  |  | 102 |  |  |  | — |  |  |  | 8,089 |
Corporate bond |  |  | 3,000 |  |  |  | 29 |  |  |  | — |  |  |  | 3,029 |
Total |  | $ | 615,396 |  |  | $ | 8,768 |  |  | $ | (1,475 | ) |  | $ | 622,689 |
Schedule of Available for Sale Securities with Continuous Unrealized Losses and Approximate Fair Value of Investments | The following tables present the Company’s available for sale securities in a continuous unrealized loss position and the approximate fair value of these investments as of March 31, 2021 and December 31, 2020.
|  | March 31, 2021 |
|  | Duration of Unrealized Loss |
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Approximate |  |  |  |  |  |  | Approximate |  |  |  |  |  |  | Approximate |  |  |  |  |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(In thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S government-sponsored agencies |  | $ | 211,882 |  |  | $ | (7,862 | ) |  | $ | — |  |  | $ | — |  |  | $ | 211,882 |  |  | $ | (7,862 | )
Mortgage-backed securities-residential |  |  | 290,133 |  |  |  | (8,244 | ) |  |  | 6,534 |  |  |  | (10 | ) |  |  | 296,667 |  |  |  | (8,254 | )
SBA pool securities |  |  | 36,923 |  |  |  | (1,129 | ) |  |  | 2,057 |  |  |  | (15 | ) |  |  | 38,980 |  |  |  | (1,144 | )
Total |  | $ | 538,938 |  |  | $ | (17,235 | ) |  | $ | 8,591 |  |  | $ | (25 | ) |  | $ | 547,529 |  |  | $ | (17,260 | )
|  | December 31, 2020 |
|  | Duration of Unrealized Loss |
|  | Less Than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  | Approximate |  |  |  |  |  |  | Approximate |  |  |  |  |  |  | Approximate |  |  |  |  |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(In thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. government-sponsored agencies |  | $ | 73,769 |  |  | $ | (655 | ) |  | $ | — |  |  | $ | — |  |  | $ | 73,769 |  |  | $ | (655 | )
Mortgage-backed securities-residential |  |  | 103,340 |  |  |  | (430 | ) |  |  | 13,914 |  |  |  | (31 | ) |  |  | 117,254 |  |  |  | (461 | )
SBA pool securities |  |  | 39,720 |  |  |  | (343 | ) |  |  | 2,095 |  |  |  | (16 | ) |  |  | 41,815 |  |  |  | (359 | )
Total |  | $ | 216,829 |  |  | $ | (1,428 | ) |  | $ | 16,009 |  |  | $ | (47 | ) |  | $ | 232,838 |  |  | $ | (1,475 | )

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