Annual report pursuant to Section 13 and 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 ($)
Dec. 31, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 198,348,000 $ 475,029,000
Less than 12 Months, Unrealized Losses (1,204,000) (5,361,000)
More than 12 Months, Fair Value 75,035,000 385,433,000
More than 12 Months, Unrealized Losses (696,000) (10,184,000)
Total, Fair Value 273,383,000 860,462,000
Unrealized Losses, Total (1,900,000) (15,545,000)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 4,526,000 133,513,000
Less than 12 Months, Unrealized Losses (29,000) (1,566,000)
More than 12 Months, Fair Value 0 10,145,000
More than 12 Months, Unrealized Losses 0 (375,000)
Total, Fair Value 4,526,000 143,658,000
Unrealized Losses, Total (29,000) (1,941,000)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 44,567,000 35,478,000
Less than 12 Months, Unrealized Losses (255,000) (315,000)
More than 12 Months, Fair Value 19,902,000 33,888,000
More than 12 Months, Unrealized Losses (291,000) (668,000)
Total, Fair Value 64,469,000 69,366,000
Unrealized Losses, Total (546,000) (983,000)
Mortgage-backed securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 149,255,000 306,038,000
Less than 12 Months, Unrealized Losses (920,000) (3,480,000)
More than 12 Months, Fair Value 55,133,000 341,400,000
More than 12 Months, Unrealized Losses (405,000) (9,141,000)
Total, Fair Value 204,388,000 647,438,000
Unrealized Losses, Total $ (1,325,000) $ (12,621,000)