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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | $ 1,433,898,000 | $ 302,914,000
Less than 12 Months, Unrealized Losses | (23,374,000) | (2,239,000)
More than 12 Months, Fair Value | 96,756,000 | 17,585,000
More than 12 Months, Unrealized Losses | (1,790,000) | (101,000)
Total, Fair Value | 1,530,654,000 | 320,499,000
Unrealized Losses, Total | (25,164,000) | (2,340,000)
U.S. government and agency securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Losses | 0 | 0
More than 12 Months, Fair Value | 4,255,000 | 5,456,000
More than 12 Months, Unrealized Losses | (41,000) | (52,000)
Total, Fair Value | 4,255,000 | 5,456,000
Unrealized Losses, Total | (41,000) | (52,000)
Obligations of states and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 394,065,000 | 5,091,000
Less than 12 Months, Unrealized Losses | (7,885,000) | (18,000)
More than 12 Months, Fair Value | 2,072,000 | 0
More than 12 Months, Unrealized Losses | (106,000) | 0
Total, Fair Value | 396,137,000 | 5,091,000
Unrealized Losses, Total | (7,991,000) | (18,000)
Corporate and other bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 11,594,000 | 17,946,000
Less than 12 Months, Unrealized Losses | (51,000) | (52,000)
More than 12 Months, Fair Value | 1,903,000 | 10,698,000
More than 12 Months, Unrealized Losses | (3,000) | (47,000)
Total, Fair Value | 13,497,000 | 28,644,000
Unrealized Losses, Total | (54,000) | (99,000)
Commercial |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 157,804,000 | 23,547,000
Less than 12 Months, Unrealized Losses | (2,659,000) | (19,000)
More than 12 Months, Fair Value | 12,133,000 | 376,000
More than 12 Months, Unrealized Losses | (194,000) | 0
Total, Fair Value | 169,937,000 | 23,923,000
Unrealized Losses, Total | (2,853,000) | (19,000)
Residential |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 870,435,000 | 256,330,000
Less than 12 Months, Unrealized Losses | (12,779,000) | (2,150,000)
More than 12 Months, Fair Value | 76,393,000 | 1,055,000
More than 12 Months, Unrealized Losses | (1,446,000) | (2,000)
Total, Fair Value | 946,828,000 | 257,385,000
Unrealized Losses, Total | (14,225,000) | (2,152,000)
Agency | Commercial |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 136,397,000 | 5,893,000
Less than 12 Months, Unrealized Losses | (2,556,000) | (2,000)
More than 12 Months, Fair Value | 344,000 | 376,000
More than 12 Months, Unrealized Losses | (1,000) | 0
Total, Fair Value | 136,741,000 | 6,269,000
Unrealized Losses, Total | (2,557,000) | (2,000)
Agency | Residential |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 857,253,000 | 219,388,000
Less than 12 Months, Unrealized Losses | (12,584,000) | (1,944,000)
More than 12 Months, Fair Value | 76,393,000 | 1,055,000
More than 12 Months, Unrealized Losses | (1,446,000) | (2,000)
Total, Fair Value | 933,646,000 | 220,443,000
Unrealized Losses, Total | (14,030,000) | (1,946,000)
Non-agency | Commercial |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 21,407,000 | 17,654,000
Less than 12 Months, Unrealized Losses | (103,000) | (17,000)
More than 12 Months, Fair Value | 11,789,000 | 0
More than 12 Months, Unrealized Losses | (193,000) | 0
Total, Fair Value | 33,196,000 | 17,654,000
Unrealized Losses, Total | (296,000) | (17,000)
Non-agency | Residential |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Less than 12 months, Fair Value | 13,182,000 | 36,942,000
Less than 12 Months, Unrealized Losses | (195,000) | (206,000)
More than 12 Months, Fair Value | 0 | 0
More than 12 Months, Unrealized Losses | 0 | 0
Total, Fair Value | 13,182,000 | 36,942,000
Unrealized Losses, Total | $ (195,000) | $ (206,000)

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