Annual report pursuant to Section 13 and 15(d)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details)

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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 3,204,361 $ 3,448,784
Gross Unrealized Gains 293 65,198
Gross Unrealized (Losses) (462,838) (32,332)
Total AFS securities, Estimated Fair Value 2,741,816 3,481,650
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 70,196 73,830
Gross Unrealized Gains 0 179
Gross Unrealized (Losses) (8,253) (160)
Total AFS securities, Estimated Fair Value 61,943 73,849
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 959,999 971,126
Gross Unrealized Gains 137 39,343
Gross Unrealized (Losses) (152,701) (2,073)
Total AFS securities, Estimated Fair Value 807,435 1,008,396
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 243,979 150,201
Gross Unrealized Gains 0 3,353
Gross Unrealized (Losses) (17,599) (178)
Total AFS securities, Estimated Fair Value 226,380 153,376
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 349,598 468,893
Gross Unrealized Gains 75 6,900
Gross Unrealized (Losses) (43,512) (4,636)
Total AFS securities, Estimated Fair Value 306,161 471,157
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 250,186 361,806
Gross Unrealized Gains 75 6,761
Gross Unrealized (Losses) (39,268) (4,215)
Total AFS securities, Estimated Fair Value 210,993 364,352
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 99,412 107,087
Gross Unrealized Gains 0 139
Gross Unrealized (Losses) (4,244) (421)
Total AFS securities, Estimated Fair Value 95,168 106,805
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,578,925 1,783,094
Gross Unrealized Gains 81 15,423
Gross Unrealized (Losses) (240,773) (25,285)
Total AFS securities, Estimated Fair Value 1,338,233 1,773,232
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,510,110 1,691,651
Gross Unrealized Gains 81 15,180
Gross Unrealized (Losses) (233,961) (24,337)
Total AFS securities, Estimated Fair Value 1,276,230 1,682,494
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 68,815 91,443
Gross Unrealized Gains 0 243
Gross Unrealized (Losses) (6,812) (948)
Total AFS securities, Estimated Fair Value 62,003 90,738
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,664 1,640
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,664 $ 1,640