Quarterly report pursuant to Section 13 or 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
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,613,078 $ 2,615,536
Gross Unrealized Gains 1,028 1,592
Gross Unrealized (Losses) (411,890) (385,867)
Total AFS securities, Estimated Fair Value 2,202,216 2,231,261
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 62,561 62,367
Gross Unrealized Gains 208 1,023
Gross Unrealized (Losses) (33) (34)
Total AFS securities, Estimated Fair Value 62,736 63,356
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 585,749 586,865
Gross Unrealized Gains 14 33
Gross Unrealized (Losses) (123,913) (111,451)
Total AFS securities, Estimated Fair Value 461,850 475,447
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 267,621 261,656
Gross Unrealized Gains 83 7
Gross Unrealized (Losses) (17,440) (19,774)
Total AFS securities, Estimated Fair Value 250,264 241,889
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 289,539 300,518
Gross Unrealized Gains 160 274
Gross Unrealized (Losses) (44,365) (43,146)
Total AFS securities, Estimated Fair Value 245,334 257,646
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 231,296 233,775
Gross Unrealized Gains 160 274
Gross Unrealized (Losses) (42,609) (41,181)
Total AFS securities, Estimated Fair Value 188,847 192,868
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 58,243 66,743
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,756) (1,965)
Total AFS securities, Estimated Fair Value 56,487 64,778
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,405,829 1,402,378
Gross Unrealized Gains 563 255
Gross Unrealized (Losses) (226,139) (211,462)
Total AFS securities, Estimated Fair Value 1,180,253 1,191,171
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,322,392 1,312,538
Gross Unrealized Gains 350 114
Gross Unrealized (Losses) (220,742) (205,635)
Total AFS securities, Estimated Fair Value 1,102,000 1,107,017
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 83,437 89,840
Gross Unrealized Gains 213 141
Gross Unrealized (Losses) (5,397) (5,827)
Total AFS securities, Estimated Fair Value 78,253 84,154
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,779 1,752
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,779 $ 1,752