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, 2020
Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 502,977,000 $ 198,348,000
Less than 12 Months, Unrealized Losses (4,855,000) (1,204,000)
More than 12 Months, Fair Value 27,806,000 75,035,000
More than 12 Months, Unrealized Losses (314,000) (696,000)
Total, Fair Value 530,783,000 273,383,000
Unrealized Losses, Total (5,169,000) (1,900,000)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 7,638,000
Less than 12 Months, Unrealized Losses 0 (38,000)
More than 12 Months, Fair Value 5,956,000 0
More than 12 Months, Unrealized Losses (50,000) 0
Total, Fair Value 5,956,000 7,638,000
Unrealized Losses, Total (50,000) (38,000)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 175,282,000 4,526,000
Less than 12 Months, Unrealized Losses (2,113,000) (29,000)
More than 12 Months, Fair Value 0 0
More than 12 Months, Unrealized Losses 0 0
Total, Fair Value 175,282,000 4,526,000
Unrealized Losses, Total (2,113,000) (29,000)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 38,137,000 17,323,000
Less than 12 Months, Unrealized Losses (477,000) (83,000)
More than 12 Months, Fair Value 20,283,000 19,901,000
More than 12 Months, Unrealized Losses (260,000) (291,000)
Total, Fair Value 58,420,000 37,224,000
Unrealized Losses, Total (737,000) (374,000)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 33,827,000 54,714,000
Less than 12 Months, Unrealized Losses (115,000) (554,000)
More than 12 Months, Fair Value 446,000 14,966,000
More than 12 Months, Unrealized Losses (1,000) (89,000)
Total, Fair Value 34,273,000 69,680,000
Unrealized Losses, Total (116,000) (643,000)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 255,731,000 114,147,000
Less than 12 Months, Unrealized Losses (2,150,000) (500,000)
More than 12 Months, Fair Value 1,121,000 40,168,000
More than 12 Months, Unrealized Losses (3,000) (316,000)
Total, Fair Value 256,852,000 154,315,000
Unrealized Losses, Total (2,153,000) (816,000)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 33,827,000 43,552,000
Less than 12 Months, Unrealized Losses (115,000) (530,000)
More than 12 Months, Fair Value 446,000 14,966,000
More than 12 Months, Unrealized Losses (1,000) (89,000)
Total, Fair Value 34,273,000 58,518,000
Unrealized Losses, Total (116,000) (619,000)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 198,687,000 114,147,000
Less than 12 Months, Unrealized Losses (1,407,000) (500,000)
More than 12 Months, Fair Value 1,121,000 40,168,000
More than 12 Months, Unrealized Losses (3,000) (316,000)
Total, Fair Value 199,808,000 154,315,000
Unrealized Losses, Total (1,410,000) (816,000)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 11,162,000
Less than 12 Months, Unrealized Losses 0 (24,000)
More than 12 Months, Fair Value 0 0
More than 12 Months, Unrealized Losses 0 0
Total, Fair Value 0 11,162,000
Unrealized Losses, Total 0 (24,000)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 57,044,000 0
Less than 12 Months, Unrealized Losses (743,000) 0
More than 12 Months, Fair Value 0 0
More than 12 Months, Unrealized Losses 0 0
Total, Fair Value 57,044,000 0
Unrealized Losses, Total $ (743,000) $ 0