Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details)

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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
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)