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DEBT SECURITIES - Schedule of Contractual Maturities of Securities (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Securities available-for-sale  
Within One Year $ 3,318
After One Through Five Years 279,612
After Five Through Ten Years 342,311
After Ten Years 3,308,464
Total 3,933,705
Securities held-to-maturity, Amortized Cost  
Within One Year 3,500
After One Through Five Years 182,797
After Five Through Ten Years 136,109
After Ten Years 991,114
Total 1,313,520
Securities held-to-maturity, Fair Value  
Within One Year 3,500
Due in one through five years, fair value 166,009
After Five Through Ten Years 121,369
Due after ten years, fair value 859,091
Total 1,149,969
Obligations of states and political subdivisions  
Securities available-for-sale  
Within One Year 342
After One Through Five Years 44,871
After Five Through Ten Years 125,131
After Ten Years 289,525
Total 459,869
Securities held-to-maturity, Amortized Cost  
Within One Year 3,500
After One Through Five Years 3,106
After Five Through Ten Years 4,708
After Ten Years 1,653
Total 12,967
Securities held-to-maturity, Fair Value  
Within One Year 3,500
Due in one through five years, fair value 3,129
After Five Through Ten Years 4,958
Due after ten years, fair value 1,772
Total 13,359
Mortgage-backed securities - residential  
Securities available-for-sale  
Within One Year 376
After One Through Five Years 12,295
After Five Through Ten Years 23,170
After Ten Years 2,771,878
Total 2,807,719
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 53
After Five Through Ten Years 0
After Ten Years 989,461
Total 989,514
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 51
After Five Through Ten Years 0
Due after ten years, fair value 857,319
Total 857,370
Mortgage-backed securities - commercial  
Securities available-for-sale  
Within One Year 2,600
After One Through Five Years 196,499
After Five Through Ten Years 143,676
After Ten Years 15,206
Total 357,981
Securities held-to-maturity, Amortized Cost  
Within One Year 0
After One Through Five Years 179,638
After Five Through Ten Years 131,401
After Ten Years 0
Total 311,039
Securities held-to-maturity, Fair Value  
Within One Year 0
Due in one through five years, fair value 162,829
After Five Through Ten Years 116,411
Due after ten years, fair value 0
Total 279,240
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 229,708
Total 229,708
Corporate bonds  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 4,302
After Five Through Ten Years 46,833
After Ten Years 0
Total 51,135
U.S. Treasury securities  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 20,536
After Five Through Ten Years 0
After Ten Years 0
Total 20,536
Agency debentures  
Securities available-for-sale  
Within One Year 0
After One Through Five Years 1,109
After Five Through Ten Years 3,501
After Ten Years 2,147
Total $ 6,757