Annual report pursuant to Section 13 and 15(d)

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

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SECURITIES AND OTHER INVESTMENTS (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,615,536 $ 3,204,361
Gross Unrealized Gains 1,592 293
Gross Unrealized (Losses) (385,867) (462,838)
Total AFS securities, Estimated Fair Value 2,231,261 2,741,816
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 62,367 70,196
Gross Unrealized Gains 1,023 0
Gross Unrealized (Losses) (34) (8,253)
Total AFS securities, Estimated Fair Value 63,356 61,943
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 586,865 959,999
Gross Unrealized Gains 33 137
Gross Unrealized (Losses) (111,451) (152,701)
Total AFS securities, Estimated Fair Value 475,447 807,435
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 261,656 243,979
Gross Unrealized Gains 7 0
Gross Unrealized (Losses) (19,774) (17,599)
Total AFS securities, Estimated Fair Value 241,889 226,380
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 300,518 349,598
Gross Unrealized Gains 274 75
Gross Unrealized (Losses) (43,146) (43,512)
Total AFS securities, Estimated Fair Value 257,646 306,161
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 233,775 250,186
Gross Unrealized Gains 274 75
Gross Unrealized (Losses) (41,181) (39,268)
Total AFS securities, Estimated Fair Value 192,868 210,993
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 66,743 99,412
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,965) (4,244)
Total AFS securities, Estimated Fair Value 64,778 95,168
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,402,378 1,578,925
Gross Unrealized Gains 255 81
Gross Unrealized (Losses) (211,462) (240,773)
Total AFS securities, Estimated Fair Value 1,191,171 1,338,233
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,312,538 1,510,110
Gross Unrealized Gains 114 81
Gross Unrealized (Losses) (205,635) (233,961)
Total AFS securities, Estimated Fair Value 1,107,017 1,276,230
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 89,840 68,815
Gross Unrealized Gains 141 0
Gross Unrealized (Losses) (5,827) (6,812)
Total AFS securities, Estimated Fair Value 84,154 62,003
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,752 1,664
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,752 $ 1,664