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)

v3.22.2.2
SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities $ 3,225,031 $ 3,448,784
Gross Unrealized Gains 159 65,198
Gross Unrealized (Losses) (507,867) (32,332)
Total AFS securities, Estimated Fair Value 2,717,323 3,481,650
U.S. government and agency securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 70,399 73,830
Gross Unrealized Gains 0 179
Gross Unrealized (Losses) (8,763) (160)
Total AFS securities, Estimated Fair Value 61,636 73,849
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 961,722 971,126
Gross Unrealized Gains 7 39,343
Gross Unrealized (Losses) (197,186) (2,073)
Total AFS securities, Estimated Fair Value 764,543 1,008,396
Corporate and other bonds    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 246,411 150,201
Gross Unrealized Gains 0 3,353
Gross Unrealized (Losses) (15,323) (178)
Total AFS securities, Estimated Fair Value 231,088 153,376
Commercial    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 349,314 468,893
Gross Unrealized Gains 84 6,900
Gross Unrealized (Losses) (40,824) (4,636)
Total AFS securities, Estimated Fair Value 308,574 471,157
Commercial | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 247,854 361,806
Gross Unrealized Gains 84 6,761
Gross Unrealized (Losses) (36,739) (4,215)
Total AFS securities, Estimated Fair Value 211,199 364,352
Commercial | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 101,460 107,087
Gross Unrealized Gains 0 139
Gross Unrealized (Losses) (4,085) (421)
Total AFS securities, Estimated Fair Value 97,375 106,805
Residential    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,595,531 1,783,094
Gross Unrealized Gains 68 15,423
Gross Unrealized (Losses) (245,771) (25,285)
Total AFS securities, Estimated Fair Value 1,349,828 1,773,232
Residential | Agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,520,401 1,691,651
Gross Unrealized Gains 68 15,180
Gross Unrealized (Losses) (238,966) (24,337)
Total AFS securities, Estimated Fair Value 1,281,503 1,682,494
Residential | Non-agency    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 75,130 91,443
Gross Unrealized Gains 0 243
Gross Unrealized (Losses) (6,805) (948)
Total AFS securities, Estimated Fair Value 68,325 90,738
Other securities    
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract]    
Total AFS securities 1,654 1,640
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Total AFS securities, Estimated Fair Value $ 1,654 $ 1,640