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
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,976,422 $ 2,615,536
Gross Unrealized Gains 1,797 1,592
Gross Unrealized (Losses) (422,496) (385,867)
Total AFS securities, Estimated Fair Value 2,555,723 2,231,261
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 65,328 62,367
Gross Unrealized Gains 0 1,023
Gross Unrealized (Losses) (78) (34)
Total AFS securities, Estimated Fair Value 65,250 63,356
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 600,467 586,865
Gross Unrealized Gains 9 33
Gross Unrealized (Losses) (131,091) (111,451)
Total AFS securities, Estimated Fair Value 469,385 475,447
Corporate Bond Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 289,123 261,656
Gross Unrealized Gains 250 7
Gross Unrealized (Losses) (17,569) (19,774)
Total AFS securities, Estimated Fair Value 271,804 241,889
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 369,162 300,518
Gross Unrealized Gains 387 274
Gross Unrealized (Losses) (45,853) (43,146)
Total AFS securities, Estimated Fair Value 323,696 257,646
Commercial Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 290,895 233,775
Gross Unrealized Gains 377 274
Gross Unrealized (Losses) (43,817) (41,181)
Total AFS securities, Estimated Fair Value 247,455 192,868
Commercial Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 78,267 66,743
Gross Unrealized Gains 10 0
Gross Unrealized (Losses) (2,036) (1,965)
Total AFS securities, Estimated Fair Value 76,241 64,778
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,650,537 1,402,378
Gross Unrealized Gains 1,151 255
Gross Unrealized (Losses) (227,905) (211,462)
Total AFS securities, Estimated Fair Value 1,423,783 1,191,171
Residential Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,547,394 1,312,538
Gross Unrealized Gains 762 114
Gross Unrealized (Losses) (223,054) (205,635)
Total AFS securities, Estimated Fair Value 1,325,102 1,107,017
Residential Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 103,143 89,840
Gross Unrealized Gains 389 141
Gross Unrealized (Losses) (4,851) (5,827)
Total AFS securities, Estimated Fair Value 98,681 84,154
Collateralized Securities, Other [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,805 1,752
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,805 $ 1,752