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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | $ 3,302,775 | $ 3,448,784
Gross Unrealized Gains | 1,406 | 65,198
Gross Unrealized (Losses) | (352,760) | (32,332)
Total AFS securities, Estimated Fair Value | 2,951,421 | 3,481,650
U.S. government and agency securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 71,665 | 73,830
Gross Unrealized Gains | 0 | 179
Gross Unrealized (Losses) | (5,925) | (160)
Total AFS securities, Estimated Fair Value | 65,740 | 73,849
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 964,651 | 971,126
Gross Unrealized Gains | 578 | 39,343
Gross Unrealized (Losses) | (142,802) | (2,073)
Total AFS securities, Estimated Fair Value | 822,427 | 1,008,396
Corporate and other bonds |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 184,304 | 150,201
Gross Unrealized Gains | 72 | 3,353
Gross Unrealized (Losses) | (6,484) | (178)
Total AFS securities, Estimated Fair Value | 177,892 | 153,376
Commercial |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 430,582 | 468,893
Gross Unrealized Gains | 90 | 6,900
Gross Unrealized (Losses) | (30,837) | (4,636)
Total AFS securities, Estimated Fair Value | 399,835 | 471,157
Commercial | Agency |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 326,117 | 361,806
Gross Unrealized Gains | 90 | 6,761
Gross Unrealized (Losses) | (27,246) | (4,215)
Total AFS securities, Estimated Fair Value | 298,961 | 364,352
Commercial | Non-agency |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 104,465 | 107,087
Gross Unrealized Gains | 0 | 139
Gross Unrealized (Losses) | (3,591) | (421)
Total AFS securities, Estimated Fair Value | 100,874 | 106,805
Residential |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 1,649,924 | 1,783,094
Gross Unrealized Gains | 666 | 15,423
Gross Unrealized (Losses) | (166,712) | (25,285)
Total AFS securities, Estimated Fair Value | 1,483,878 | 1,773,232
Residential | Agency |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 1,571,036 | 1,691,651
Gross Unrealized Gains | 665 | 15,180
Gross Unrealized (Losses) | (161,629) | (24,337)
Total AFS securities, Estimated Fair Value | 1,410,072 | 1,682,494
Residential | Non-agency |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 78,888 | 91,443
Gross Unrealized Gains | 1 | 243
Gross Unrealized (Losses) | (5,083) | (948)
Total AFS securities, Estimated Fair Value | 73,806 | 90,738
Other securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 1,649 | 1,640
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Total AFS securities, Estimated Fair Value | $ 1,649 | $ 1,640

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