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DEBT SECURITIES - Schedule of Contractual Maturities of Securities (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Securities available-for-sale  
Within One Year $ 3,251
After One Through Five Years 277,898
After Five Through Ten Years 329,302
After Ten Years 2,880,027
Total 3,490,478
Securities held-to-maturity, Amortized Cost  
Within One Year 5,244
After One Through Five Years 143,406
After Five Through Ten Years 175,853
After Ten Years 1,039,133
Total 1,363,636
Securities held-to-maturity, Fair Value  
Within One Year 5,243
Due in one through five years, fair value 130,122
After Five Through Ten Years 156,151
Due after ten years, fair value 894,744
Total 1,186,260
Obligations of states and political subdivisions  
Securities available-for-sale  
Within One Year 345
After One Through Five Years 45,276
After Five Through Ten Years 90,330
After Ten Years 331,919
Total 467,870
Securities held-to-maturity, Amortized Cost  
Within One Year 5,244
After One Through Five Years 3,592
After Five Through Ten Years 4,621
After Ten Years 1,625
Total 15,082
Securities held-to-maturity, Fair Value  
Within One Year 5,243
Due in one through five years, fair value 3,635
After Five Through Ten Years 4,966
Due after ten years, fair value 1,732
Total 15,576
Mortgage-backed securities - residential  
Securities available-for-sale  
Within One Year 446
After One Through Five Years 16,887
After Five Through Ten Years 26,601
After Ten Years 2,330,221
Total 2,374,155
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 58
After Five Through Ten Years 0
After Ten Years 1,037,508
Total 1,037,566
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 57
After Five Through Ten Years 0
Due after ten years, fair value 893,012
Total 893,069
Mortgage-backed securities - commercial  
Securities available-for-sale  
Within One Year 2,460
After One Through Five Years 190,384
After Five Through Ten Years 158,333
After Ten Years 27,001
Total 378,178
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 139,756
After Five Through Ten Years 171,232
After Ten Years 0
Total 310,988
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 126,430
After Five Through Ten Years 151,185
Due after ten years, fair value 0
Total 277,615
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 188,689
Total 188,689
Corporate bonds  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 3,388
After Five Through Ten Years 50,096
After Ten Years 0
Total 53,484
U.S. Treasury securities  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 20,579
After Five Through Ten Years 0
After Ten Years 0
Total 20,579
Agency debentures  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 1,384
After Five Through Ten Years 3,942
After Ten Years 2,197
Total $ 7,523