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)

v3.25.0.1
SECURITIES AND OTHER INVESTMENTS (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,844,763 $ 2,615,536
Gross Unrealized Gains 3,378 1,592
Gross Unrealized (Losses) (405,975) (385,867)
Total AFS securities, Estimated Fair Value 2,442,166 2,231,261
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 65,650 62,367
Gross Unrealized Gains 390 1,023
Gross Unrealized (Losses) (27) (34)
Total AFS securities, Estimated Fair Value 66,013 63,356
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 597,956 586,865
Gross Unrealized Gains 84 33
Gross Unrealized (Losses) (129,703) (111,451)
Total AFS securities, Estimated Fair Value 468,337 475,447
Corporate Bond Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 253,526 261,656
Gross Unrealized Gains 505 7
Gross Unrealized (Losses) (9,319) (19,774)
Total AFS securities, Estimated Fair Value 244,712 241,889
Commercial Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 347,501 300,518
Gross Unrealized Gains 352 274
Gross Unrealized (Losses) (46,788) (43,146)
Total AFS securities, Estimated Fair Value 301,065 257,646
Commercial Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 285,949 233,775
Gross Unrealized Gains 348 274
Gross Unrealized (Losses) (44,678) (41,181)
Total AFS securities, Estimated Fair Value 241,619 192,868
Commercial Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 61,552 66,743
Gross Unrealized Gains 4 0
Gross Unrealized (Losses) (2,110) (1,965)
Total AFS securities, Estimated Fair Value 59,446 64,778
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,578,270 1,402,378
Gross Unrealized Gains 2,047 255
Gross Unrealized (Losses) (220,138) (211,462)
Total AFS securities, Estimated Fair Value 1,360,179 1,191,171
Residential Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,478,648 1,312,538
Gross Unrealized Gains 1,375 114
Gross Unrealized (Losses) (216,754) (205,635)
Total AFS securities, Estimated Fair Value 1,263,269 1,107,017
Residential Mortgage-Backed Securities [Member] | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 99,622 89,840
Gross Unrealized Gains 672 141
Gross Unrealized (Losses) (3,384) (5,827)
Total AFS securities, Estimated Fair Value 96,910 84,154
Collateralized Securities, Other [Member]    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,860 1,752
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,860 $ 1,752