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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details) | Mar. 31, 2020 USD ($) Position | Dec. 31, 2019 USD ($) Position
--- | --- | ---
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 11 | 88
12 months or longer | Position | 5 | 62
Total | Position | 16 | 150
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 5,106,000 | $ 710,602,000
12 months or longer | 331,000 | 83,378,000
Total | 5,437,000 | 793,980,000
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 16,000 | 8,351,000
12 months or longer | 0 | 789,000
Total | $ 16,000 | $ 9,140,000
Equity and Other Securities, Continuous Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 |
12 months or longer | Position | 0 |
Total | Position | 1 |
Equity and Other Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 73,000 |
12 months or longer | 0 |
Total | 73,000 |
Equity and Other Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 28,000 |
12 months or longer | 0 |
Total | 28,000 |
Available-for-sale, allowance for credit losses | $ 0 |
U.S. Treasury and Agency Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position |  | 12
12 months or longer | Position |  | 5
Total | Position |  | 17
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months |  | $ 592,678,000
12 months or longer |  | 25,998,000
Total |  | 618,676,000
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months |  | 7,970,000
12 months or longer |  | 5,000
Total |  | $ 7,975,000
Obligations of State and Political Subdivisions [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 9 | 21
12 months or longer | Position | 0 | 0
Total | Position | 9 | 21
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 1,444,000 | $ 22,716,000
12 months or longer | 0 | 0
Total | 1,444,000 | 22,716,000
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 2,000 | 26,000
12 months or longer | 0 | 0
Total | $ 2,000 | $ 26,000
Government Agency Mortgage-Backed Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 | 50
12 months or longer | Position | 3 | 52
Total | Position | 4 | 102
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 1,154,000 | $ 89,237,000
12 months or longer | 304,000 | 52,975,000
Total | 1,458,000 | 142,212,000
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 10,000 | 341,000
12 months or longer | 0 | 766,000
Total | $ 10,000 | $ 1,107,000
Corporate Debt Securities [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 |
12 months or longer | Position | 0 |
Total | Position | 1 |
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 2,508,000 |
12 months or longer | 0 |
Total | 2,508,000 |
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 4,000 |
12 months or longer | 0 |
Total | $ 4,000 |
Corporate Debt Securities [Member] | A- or Better [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Total | Position | 1 |
Government Agency Collateralized Mortgage Obligations [Member] |  |
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 5
12 months or longer | Position | 2 | 5
Total | Position | 2 | 10
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 5,971,000
12 months or longer | 27,000 | 4,405,000
Total | 27,000 | 10,376,000
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 14,000
12 months or longer | 0 | 18,000
Total | $ 0 | $ 32,000
Equity Securities, at Fair Value [Member] |  |
Equity and Other Securities, Continuous Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 |
12 months or longer | Position | 0 |
Total | Position | 1 |
Equity and Other Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 73,000 |
12 months or longer | 0 |
Total | 73,000 |
Equity and Other Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses [Abstract] |  |
Less than 12 months | 28,000 |
12 months or longer | 0 |
Total | $ 28,000 |

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