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
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,608,028 $ 3,204,361
Gross Unrealized Gains 308 293
Gross Unrealized (Losses) (523,408) (462,838)
Total AFS securities, Estimated Fair Value 2,084,928 2,741,816
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 62,221 70,196
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (383) (8,253)
Total AFS securities, Estimated Fair Value 61,838 61,943
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 587,340 959,999
Gross Unrealized Gains 0 137
Gross Unrealized (Losses) (169,880) (152,701)
Total AFS securities, Estimated Fair Value 417,460 807,435
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 267,816 243,979
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (24,998) (17,599)
Total AFS securities, Estimated Fair Value 242,818 226,380
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 287,260 349,598
Gross Unrealized Gains 307 75
Gross Unrealized (Losses) (52,864) (43,512)
Total AFS securities, Estimated Fair Value 234,703 306,161
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 215,203 250,186
Gross Unrealized Gains 307 75
Gross Unrealized (Losses) (50,289) (39,268)
Total AFS securities, Estimated Fair Value 165,221 210,993
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 72,057 99,412
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (2,575) (4,244)
Total AFS securities, Estimated Fair Value 69,482 95,168
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,401,664 1,578,925
Gross Unrealized Gains 1 81
Gross Unrealized (Losses) (275,283) (240,773)
Total AFS securities, Estimated Fair Value 1,126,382 1,338,233
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,319,987 1,510,110
Gross Unrealized Gains 1 81
Gross Unrealized (Losses) (268,152) (233,961)
Total AFS securities, Estimated Fair Value 1,051,836 1,276,230
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 81,677 68,815
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (7,131) (6,812)
Total AFS securities, Estimated Fair Value 74,546 62,003
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,727 1,664
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,727 $ 1,664