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
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,942,685 $ 2,615,536
Gross Unrealized Gains 9,292 1,592
Gross Unrealized (Losses) (343,795) (385,867)
Total AFS securities, Estimated Fair Value 2,608,182 2,231,261
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 65,384 62,367
Gross Unrealized Gains 1,313 1,023
Gross Unrealized (Losses) (26) (34)
Total AFS securities, Estimated Fair Value 66,671 63,356
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 600,074 586,865
Gross Unrealized Gains 294 33
Gross Unrealized (Losses) (111,841) (111,451)
Total AFS securities, Estimated Fair Value 488,527 475,447
Corporate Bond Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 283,861 261,656
Gross Unrealized Gains 631 7
Gross Unrealized (Losses) (12,517) (19,774)
Total AFS securities, Estimated Fair Value 271,975 241,889
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 364,248 300,518
Gross Unrealized Gains 1,926 274
Gross Unrealized (Losses) (39,357) (43,146)
Total AFS securities, Estimated Fair Value 326,817 257,646
Commercial Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 287,747 233,775
Gross Unrealized Gains 1,724 274
Gross Unrealized (Losses) (37,721) (41,181)
Total AFS securities, Estimated Fair Value 251,750 192,868
Commercial Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 76,501 66,743
Gross Unrealized Gains 202 0
Gross Unrealized (Losses) (1,636) (1,965)
Total AFS securities, Estimated Fair Value 75,067 64,778
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,627,286 1,402,378
Gross Unrealized Gains 5,128 255
Gross Unrealized (Losses) (180,054) (211,462)
Total AFS securities, Estimated Fair Value 1,452,360 1,191,171
Residential Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,522,319 1,312,538
Gross Unrealized Gains 4,144 114
Gross Unrealized (Losses) (176,187) (205,635)
Total AFS securities, Estimated Fair Value 1,350,276 1,107,017
Residential Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 104,967 89,840
Gross Unrealized Gains 984 141
Gross Unrealized (Losses) (3,867) (5,827)
Total AFS securities, Estimated Fair Value 102,084 84,154
Collateralized Securities, Other [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,832 1,752
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,832 $ 1,752