v3.26.1
Securities - Scheduled Contractual Maturities of HTM Debt Securities (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Amortized cost  
Within One Year $ 74,402
After One Year through Five Years 653,436
After Five Years through Ten Years 1,010,532
After Ten Years 1,120,608
Total 2,858,978
Fair value  
Within One Year 72,898
After One Year through Five Years 623,357
After Five Years through Ten Years 854,915
After Ten Years 901,833
Total $ 2,453,003
Weighted Average Yield  
Within One Year 0.83%
After One Year through Five Years 1.17%
After Five Years through Ten Years 1.94%
After Ten Years 1.75%
Total 1.66%
U.S. Treasury securities  
Amortized cost  
Within One Year $ 74,402
After One Year through Five Years 467,657
After Five Years through Ten Years 0
After Ten Years 0
Total 542,059
Fair value  
Within One Year 72,898
After One Year through Five Years 453,150
After Five Years through Ten Years 0
After Ten Years 0
Total $ 526,048
Weighted Average Yield  
Within One Year 0.83%
After One Year through Five Years 1.08%
After Five Years through Ten Years 0.00%
After Ten Years 0.00%
Total 1.05%
U.S. government agency and U.S. government-sponsored enterprise debt securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 129,956
After Five Years through Ten Years 812,191
After Ten Years 65,790
Total 1,007,937
Fair value  
Within One Year 0
After One Year through Five Years 118,920
After Five Years through Ten Years 683,742
After Ten Years 52,799
Total $ 855,461
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 1.37%
After Five Years through Ten Years 1.96%
After Ten Years 2.12%
Total 1.90%
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 55,823
After Five Years through Ten Years 184,457
After Ten Years 883,852
Total 1,124,132
Fair value  
Within One Year 0
After One Year through Five Years 51,287
After Five Years through Ten Years 159,382
After Ten Years 717,435
Total $ 928,104
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 1.51%
After Five Years through Ten Years 1.81%
After Ten Years 1.67%
Total 1.69%
Municipal securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 0
After Five Years through Ten Years 13,884
After Ten Years 170,966
Total 184,850
Fair value  
Within One Year 0
After One Year through Five Years 0
After Five Years through Ten Years 11,791
After Ten Years 131,599
Total $ 143,390
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 0.00%
After Five Years through Ten Years 2.35%
After Ten Years 1.99%
Total 2.02%