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DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Securities available-for-sale:    
Amortized Cost $ 3,952,753 $ 3,980,151
Gross Unrealized Gains 29,170 52,604
Gross Unrealized Losses (48,218) (39,370)
Fair Value 3,933,705 3,993,385
Securities held-to-maturity    
Amortized Cost 1,313,520 1,336,632
Gross Unrealized Gains 401 545
Gross Unrealized Losses (163,952) (166,359)
Fair Value 1,149,969 1,170,818
Obligations of states and political subdivisions    
Securities available-for-sale:    
Amortized Cost 454,978 458,290
Gross Unrealized Gains 6,612 13,518
Gross Unrealized Losses (1,721) (649)
Fair Value 459,869 471,159
Securities held-to-maturity    
Amortized Cost 12,967 12,902
Gross Unrealized Gains 401 545
Gross Unrealized Losses (9) (6)
Fair Value 13,359 13,441
Mortgage-backed securities - residential    
Securities available-for-sale:    
Amortized Cost 2,818,727 2,871,733
Gross Unrealized Gains 20,363 36,881
Gross Unrealized Losses (31,371) (24,325)
Fair Value 2,807,719 2,884,289
Securities held-to-maturity    
Amortized Cost 989,514 1,012,716
Gross Unrealized Gains 0 0
Gross Unrealized Losses (132,144) (134,994)
Fair Value 857,370 877,722
Mortgage-backed securities - commercial    
Securities available-for-sale:    
Amortized Cost 369,056 381,934
Gross Unrealized Gains 1,210 1,622
Gross Unrealized Losses (12,285) (11,750)
Fair Value 357,981 371,806
Securities held-to-maturity    
Amortized Cost 311,039 311,014
Gross Unrealized Gains 0 0
Gross Unrealized Losses (31,799) (31,359)
Fair Value 279,240 279,655
Collateralized loan obligations    
Securities available-for-sale:    
Amortized Cost 230,500 188,500
Gross Unrealized Gains 0 1
Gross Unrealized Losses (792) (185)
Fair Value 229,708 188,316
Corporate bonds    
Securities available-for-sale:    
Amortized Cost 52,028 51,828
Gross Unrealized Gains 985 527
Gross Unrealized Losses (1,878) (2,440)
Fair Value 51,135 49,915
U.S. Treasury securities    
Securities available-for-sale:    
Amortized Cost 20,648 20,623
Gross Unrealized Gains 0 46
Gross Unrealized Losses (112) 0
Fair Value 20,536 20,669
Agency debentures    
Securities available-for-sale:    
Amortized Cost 6,816 7,243
Gross Unrealized Gains 0 9
Gross Unrealized Losses (59) (21)
Fair Value $ 6,757 $ 7,231