Annual report [Section 13 and 15(d), not S-K Item 405]

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, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 4,489,998 $ 2,844,763
Gross Unrealized Gains 19,804 3,378
Gross Unrealized (Losses) (315,501) (405,975)
Total AFS securities, Estimated Fair Value 4,194,301 2,442,166
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 103,335 65,650
Gross Unrealized Gains 681 390
Gross Unrealized (Losses) (14) (27)
Total AFS securities, Estimated Fair Value 104,002 66,013
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 589,194 597,956
Gross Unrealized Gains 178 84
Gross Unrealized (Losses) (101,487) (129,703)
Total AFS securities, Estimated Fair Value 487,885 468,337
Corporate Bond Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 221,432 253,526
Gross Unrealized Gains 709 505
Gross Unrealized (Losses) (4,207) (9,319)
Total AFS securities, Estimated Fair Value 217,934 244,712
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 469,414 347,501
Gross Unrealized Gains 1,463 352
Gross Unrealized (Losses) (41,711) (46,788)
Total AFS securities, Estimated Fair Value 429,166 301,065
Commercial Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 354,405 285,949
Gross Unrealized Gains 1,276 348
Gross Unrealized (Losses) (39,806) (44,678)
Total AFS securities, Estimated Fair Value 315,875 241,619
Commercial Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 115,009 61,552
Gross Unrealized Gains 187 4
Gross Unrealized (Losses) (1,905) (2,110)
Total AFS securities, Estimated Fair Value 113,291 59,446
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 3,104,667 1,578,270
Gross Unrealized Gains 16,773 2,047
Gross Unrealized (Losses) (168,082) (220,138)
Total AFS securities, Estimated Fair Value 2,953,358 1,360,179
Residential Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 2,942,900 1,478,648
Gross Unrealized Gains 15,838 1,375
Gross Unrealized (Losses) (165,524) (216,754)
Total AFS securities, Estimated Fair Value 2,793,214 1,263,269
Residential Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 161,767 99,622
Gross Unrealized Gains 935 672
Gross Unrealized (Losses) (2,558) (3,384)
Total AFS securities, Estimated Fair Value 160,144 96,910
Collateralized Securities, Other [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,956 1,860
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,956 $ 1,860