Quarterly report [Sections 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, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 4,182,109 $ 2,844,763
Gross Unrealized Gains 11,572 3,378
Gross Unrealized (Losses) (384,400) (405,975)
Total AFS securities, Estimated Fair Value 3,809,281 2,442,166
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 154,536 65,650
Gross Unrealized Gains 712 390
Gross Unrealized (Losses) (39) (27)
Total AFS securities, Estimated Fair Value 155,209 66,013
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 604,663 597,956
Gross Unrealized Gains 135 84
Gross Unrealized (Losses) (137,935) (129,703)
Total AFS securities, Estimated Fair Value 466,863 468,337
Corporate Bond Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 268,497 253,526
Gross Unrealized Gains 512 505
Gross Unrealized (Losses) (7,774) (9,319)
Total AFS securities, Estimated Fair Value 261,235 244,712
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 441,480 347,501
Gross Unrealized Gains 1,271 352
Gross Unrealized (Losses) (44,079) (46,788)
Total AFS securities, Estimated Fair Value 398,672 301,065
Commercial Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 344,879 285,949
Gross Unrealized Gains 1,098 348
Gross Unrealized (Losses) (41,908) (44,678)
Total AFS securities, Estimated Fair Value 304,069 241,619
Commercial Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 96,601 61,552
Gross Unrealized Gains 173 4
Gross Unrealized (Losses) (2,171) (2,110)
Total AFS securities, Estimated Fair Value 94,603 59,446
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 2,711,024 1,578,270
Gross Unrealized Gains 8,942 2,047
Gross Unrealized (Losses) (194,573) (220,138)
Total AFS securities, Estimated Fair Value 2,525,393 1,360,179
Residential Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 2,592,111 1,478,648
Gross Unrealized Gains 8,133 1,375
Gross Unrealized (Losses) (191,707) (216,754)
Total AFS securities, Estimated Fair Value 2,408,537 1,263,269
Residential Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 118,913 99,622
Gross Unrealized Gains 809 672
Gross Unrealized (Losses) (2,866) (3,384)
Total AFS securities, Estimated Fair Value 116,856 96,910
Collateralized Securities, Other [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,909 1,860
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,909 $ 1,860