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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 1,000,782,000 $ 302,914,000
Less than 12 Months, Unrealized Losses (21,058,000) (2,239,000)
More than 12 Months, Fair Value 21,288,000 17,585,000
More than 12 Months, Unrealized Losses (93,000) (101,000)
Total, Fair Value 1,022,070,000 320,499,000
Unrealized Losses, Total (21,151,000) (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 4,899,000 5,456,000
More than 12 Months, Unrealized Losses (47,000) (52,000)
Total, Fair Value 4,899,000 5,456,000
Unrealized Losses, Total (47,000) (52,000)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 271,172,000 5,091,000
Less than 12 Months, Unrealized Losses (4,956,000) (18,000)
More than 12 Months, Fair Value 0 0
More than 12 Months, Unrealized Losses 0 0
Total, Fair Value 271,172,000 5,091,000
Unrealized Losses, Total (4,956,000) (18,000)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 42,612,000 17,946,000
Less than 12 Months, Unrealized Losses (237,000) (52,000)
More than 12 Months, Fair Value 4,785,000 10,698,000
More than 12 Months, Unrealized Losses (6,000) (47,000)
Total, Fair Value 47,397,000 28,644,000
Unrealized Losses, Total (243,000) (99,000)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 92,444,000 23,547,000
Less than 12 Months, Unrealized Losses (1,724,000) (19,000)
More than 12 Months, Fair Value 359,000 376,000
More than 12 Months, Unrealized Losses (1,000) 0
Total, Fair Value 92,803,000 23,923,000
Unrealized Losses, Total (1,725,000) (19,000)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 594,554,000 256,330,000
Less than 12 Months, Unrealized Losses (14,141,000) (2,150,000)
More than 12 Months, Fair Value 11,245,000 1,055,000
More than 12 Months, Unrealized Losses (39,000) (2,000)
Total, Fair Value 605,799,000 257,385,000
Unrealized Losses, Total (14,180,000) (2,152,000)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 65,708,000 5,893,000
Less than 12 Months, Unrealized Losses (1,614,000) (2,000)
More than 12 Months, Fair Value 359,000 376,000
More than 12 Months, Unrealized Losses (1,000) 0
Total, Fair Value 66,067,000 6,269,000
Unrealized Losses, Total (1,615,000) (2,000)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 558,523,000 219,388,000
Less than 12 Months, Unrealized Losses (13,650,000) (1,944,000)
More than 12 Months, Fair Value 1,175,000 1,055,000
More than 12 Months, Unrealized Losses (18,000) (2,000)
Total, Fair Value 559,698,000 220,443,000
Unrealized Losses, Total (13,668,000) (1,946,000)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 26,736,000 17,654,000
Less than 12 Months, Unrealized Losses (110,000) (17,000)
More than 12 Months, Fair Value 0 0
More than 12 Months, Unrealized Losses 0 0
Total, Fair Value 26,736,000 17,654,000
Unrealized Losses, Total (110,000) (17,000)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 36,031,000 36,942,000
Less than 12 Months, Unrealized Losses (491,000) (206,000)
More than 12 Months, Fair Value 10,070,000 0
More than 12 Months, Unrealized Losses (21,000) 0
Total, Fair Value 46,101,000 36,942,000
Unrealized Losses, Total $ (512,000) $ (206,000)