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, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 1,733,749,000 $ 302,914,000
Less than 12 Months, Unrealized Losses (28,409,000) (2,239,000)
More than 12 Months, Fair Value 139,747,000 17,585,000
More than 12 Months, Unrealized Losses (3,923,000) (101,000)
Total, Fair Value 1,873,496,000 320,499,000
Unrealized Losses, Total (32,332,000) (2,340,000)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 64,474,000 0
Less than 12 Months, Unrealized Losses (115,000) 0
More than 12 Months, Fair Value 3,900,000 5,456,000
More than 12 Months, Unrealized Losses (45,000) (52,000)
Total, Fair Value 68,374,000 5,456,000
Unrealized Losses, Total (160,000) (52,000)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 249,701,000 5,091,000
Less than 12 Months, Unrealized Losses (2,020,000) (18,000)
More than 12 Months, Fair Value 2,123,000 0
More than 12 Months, Unrealized Losses (53,000) 0
Total, Fair Value 251,824,000 5,091,000
Unrealized Losses, Total (2,073,000) (18,000)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 21,134,000 17,946,000
Less than 12 Months, Unrealized Losses (177,000) (52,000)
More than 12 Months, Fair Value 703,000 10,698,000
More than 12 Months, Unrealized Losses (1,000) (47,000)
Total, Fair Value 21,837,000 28,644,000
Unrealized Losses, Total (178,000) (99,000)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 209,347,000 23,547,000
Less than 12 Months, Unrealized Losses (4,366,000) (19,000)
More than 12 Months, Fair Value 14,201,000 376,000
More than 12 Months, Unrealized Losses (270,000) 0
Total, Fair Value 223,548,000 23,923,000
Unrealized Losses, Total (4,636,000) (19,000)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,189,093,000 256,330,000
Less than 12 Months, Unrealized Losses (21,731,000) (2,150,000)
More than 12 Months, Fair Value 118,820,000 1,055,000
More than 12 Months, Unrealized Losses (3,554,000) (2,000)
Total, Fair Value 1,307,913,000 257,385,000
Unrealized Losses, Total (25,285,000) (2,152,000)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 175,588,000 5,893,000
Less than 12 Months, Unrealized Losses (4,053,000) (2,000)
More than 12 Months, Fair Value 3,172,000 376,000
More than 12 Months, Unrealized Losses (162,000) 0
Total, Fair Value 178,760,000 6,269,000
Unrealized Losses, Total (4,215,000) (2,000)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,140,701,000 219,388,000
Less than 12 Months, Unrealized Losses (21,147,000) (1,944,000)
More than 12 Months, Fair Value 106,104,000 1,055,000
More than 12 Months, Unrealized Losses (3,190,000) (2,000)
Total, Fair Value 1,246,805,000 220,443,000
Unrealized Losses, Total (24,337,000) (1,946,000)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 33,759,000 17,654,000
Less than 12 Months, Unrealized Losses (313,000) (17,000)
More than 12 Months, Fair Value 11,029,000 0
More than 12 Months, Unrealized Losses (108,000) 0
Total, Fair Value 44,788,000 17,654,000
Unrealized Losses, Total (421,000) (17,000)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 48,392,000 36,942,000
Less than 12 Months, Unrealized Losses (584,000) (206,000)
More than 12 Months, Fair Value 12,716,000 0
More than 12 Months, Unrealized Losses (364,000) 0
Total, Fair Value 61,108,000 36,942,000
Unrealized Losses, Total $ (948,000) $ (206,000)