Quarterly report pursuant to Section 13 or 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
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 2,660,254 $ 3,204,361
Gross Unrealized Gains 233 293
Gross Unrealized (Losses) (408,122) (462,838)
Total AFS securities, Estimated Fair Value 2,252,365 2,741,816
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 69,474 70,196
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,900) (8,253)
Total AFS securities, Estimated Fair Value 62,574 61,943
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 650,328 959,999
Gross Unrealized Gains 20 137
Gross Unrealized (Losses) (127,251) (152,701)
Total AFS securities, Estimated Fair Value 523,097 807,435
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 171,899 243,979
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (19,893) (17,599)
Total AFS securities, Estimated Fair Value 152,006 226,380
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 300,856 349,598
Gross Unrealized Gains 156 75
Gross Unrealized (Losses) (40,365) (43,512)
Total AFS securities, Estimated Fair Value 260,647 306,161
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 220,617 250,186
Gross Unrealized Gains 156 75
Gross Unrealized (Losses) (37,729) (39,268)
Total AFS securities, Estimated Fair Value 183,044 210,993
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 80,239 99,412
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (2,636) (4,244)
Total AFS securities, Estimated Fair Value 77,603 95,168
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,466,016 1,578,925
Gross Unrealized Gains 57 81
Gross Unrealized (Losses) (213,713) (240,773)
Total AFS securities, Estimated Fair Value 1,252,360 1,338,233
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,394,464 1,510,110
Gross Unrealized Gains 57 81
Gross Unrealized (Losses) (207,355) (233,961)
Total AFS securities, Estimated Fair Value 1,187,166 1,276,230
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 71,552 68,815
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (6,358) (6,812)
Total AFS securities, Estimated Fair Value 65,194 62,003
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,681 1,664
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,681 $ 1,664