v3.26.1
DEBT SECURITIES - Contractual Maturities of Securities (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Securities available-for-sale  
Within One Year $ 8,875
After One Through Five Years 288,675
After Five Through Ten Years 322,250
After Ten Years 3,499,415
Total 4,119,215
Securities held-to-maturity, Amortized Cost  
Within One Year 3,500
After One Through Five Years 192,307
After Five Through Ten Years 126,673
After Ten Years 964,333
Total 1,286,813
Securities held-to-maturity, Fair Value  
Within One Year 3,500
Due in one through five years, fair value 173,937
After Five Through Ten Years 112,540
Due after ten years, fair value 830,111
Total 1,120,088
Obligations of states and political subdivisions  
Securities available-for-sale  
Within One Year 3,386
After One Through Five Years 44,415
After Five Through Ten Years 131,205
After Ten Years 283,714
Total 462,720
Securities held-to-maturity, Amortized Cost  
Within One Year 3,500
After One Through Five Years 3,113
After Five Through Ten Years 4,751
After Ten Years 1,666
Total 13,030
Securities held-to-maturity, Fair Value  
Within One Year 3,500
Due in one through five years, fair value 3,135
After Five Through Ten Years 5,053
Due after ten years, fair value 1,836
Total 13,524
Mortgage-backed securities - residential  
Securities available-for-sale  
Within One Year 242
After One Through Five Years 10,371
After Five Through Ten Years 21,687
After Ten Years 2,968,895
Total 3,001,195
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 50
After Five Through Ten Years 0
After Ten Years 962,667
Total 962,717
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 49
After Five Through Ten Years 0
Due after ten years, fair value 828,275
Total 828,324
Mortgage-backed securities - commercial  
Securities available-for-sale  
Within One Year 5,247
After One Through Five Years 199,870
After Five Through Ten Years 133,373
After Ten Years 14,114
Total 352,604
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 189,144
After Five Through Ten Years 121,922
After Ten Years 0
Total 311,066
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 170,753
After Five Through Ten Years 107,487
Due after ten years, fair value 0
Total 278,240
Collateralized loan obligations  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 0
After Five Through Ten Years 0
After Ten Years 230,582
Total 230,582
Corporate bonds  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 12,490
After Five Through Ten Years 32,893
After Ten Years 0
Total 45,383
U.S. Treasury securities  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 20,424
After Five Through Ten Years 0
After Ten Years 0
Total 20,424
Agency debentures  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 1,105
After Five Through Ten Years 3,092
After Ten Years 2,110
Total $ 6,307