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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value measurement |  |
Fair Value | $ 1,364,734 | $ 1,020,744
U.S. Government entity mortgage-backed securities |  |
Fair value measurement |  |
Fair Value | 120,123 | 97,814
Mortgage-backed securities, residential |  |
Fair value measurement |  |
Fair Value | 626,428 | 355,121
Mortgage-backed securities, commercial |  |
Fair value measurement |  |
Fair Value | 15,671 | 18,490
Collateralized mortgage obligations |  |
Fair value measurement |  |
Fair Value | 175,005 | 214,160
State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 380,098 | 306,131
Municipal taxable |  |
Fair value measurement |  |
Fair Value | 38,626 | 23,139
U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 204 | 2,753
Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | 3,359 | 3,136
Other securities |  |
Fair value measurement |  |
Fair Value | 5,220 |
Level 1 |  |
Fair value measurement |  |
Fair Value | 0 | 0
Level 2 |  |
Fair value measurement |  |
Fair Value | 1,357,737 | 1,015,713
Derivative Assets | 1,030 | 2,465
Derivative Liabilities | (1,030) | (2,465)
Level 2 | U.S. Government entity mortgage-backed securities |  |
Fair value measurement |  |
Fair Value | 120,123 | 97,814
Level 2 | Mortgage-backed securities, residential |  |
Fair value measurement |  |
Fair Value | 626,428 | 355,121
Level 2 | Mortgage-backed securities, commercial |  |
Fair value measurement |  |
Fair Value | 15,671 | 18,490
Level 2 | Collateralized mortgage obligations |  |
Fair value measurement |  |
Fair Value | 175,005 | 214,160
Level 2 | State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 378,203 | 304,236
Level 2 | Municipal taxable |  |
Fair value measurement |  |
Fair Value | 38,626 | 23,139
Level 2 | U.S. Treasury |  |
Fair value measurement |  |
Fair Value | 204 | 2,753
Level 2 | Other securities |  |
Fair value measurement |  |
Fair Value | 3,477 |
Level 3 |  |
Fair value measurement |  |
Fair Value | 6,997 | 5,031
Level 3 | State and municipal obligations |  |
Fair value measurement |  |
Fair Value | 1,895 | 1,895
Level 3 | Collateralized debt obligations |  |
Fair value measurement |  |
Fair Value | 3,359 | $ 3,136
Level 3 | Other securities |  |
Fair value measurement |  |
Fair Value | $ 1,743 |

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