Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details)

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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,632,554 $ 3,204,361
Gross Unrealized Gains 65 293
Gross Unrealized (Losses) (450,172) (462,838)
Total AFS securities, Estimated Fair Value 2,182,448 2,741,816
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 69,359 70,196
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (8,012) (8,253)
Total AFS securities, Estimated Fair Value 61,347 61,943
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 649,572 959,999
Gross Unrealized Gains 2 137
Gross Unrealized (Losses) (136,548) (152,701)
Total AFS securities, Estimated Fair Value 513,026 807,435
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 169,995 243,979
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (27,423) (17,599)
Total AFS securities, Estimated Fair Value 142,572 226,380
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 307,549 349,598
Gross Unrealized Gains 59 75
Gross Unrealized (Losses) (45,653) (43,512)
Total AFS securities, Estimated Fair Value 261,955 306,161
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 229,165 250,186
Gross Unrealized Gains 59 75
Gross Unrealized (Losses) (43,030) (39,268)
Total AFS securities, Estimated Fair Value 186,194 210,993
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 78,384 99,412
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (2,623) (4,244)
Total AFS securities, Estimated Fair Value 75,761 95,168
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,434,376 1,578,925
Gross Unrealized Gains 4 81
Gross Unrealized (Losses) (232,535) (240,773)
Total AFS securities, Estimated Fair Value 1,201,845 1,338,233
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,363,949 1,510,110
Gross Unrealized Gains 4 81
Gross Unrealized (Losses) (226,232) (233,961)
Total AFS securities, Estimated Fair Value 1,137,721 1,276,230
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 70,427 68,815
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,303) (6,812)
Total AFS securities, Estimated Fair Value 64,124 62,003
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,703 1,664
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,703 $ 1,664