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Securities - Scheduled Contractual Maturities of HTM Debt Securities (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Amortized cost  
Within One Year $ 0
After One Year through Five Years 525,432
After Five Years through Ten Years 375,982
After Ten Years 2,092,007
Total 2,993,421
Fair value  
Within One Year 0
After One Year through Five Years 481,611
After Five Years through Ten Years 322,388
After Ten Years 1,698,675
Total $ 2,502,674
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 1.05%
After Five Years through Ten Years 1.83%
After Ten Years 1.77%
Total 1.65%
U.S. Treasury securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 525,432
After Five Years through Ten Years 0
After Ten Years 0
Total 525,432
Fair value  
Within One Year 0
After One Year through Five Years 481,611
After Five Years through Ten Years 0
After Ten Years 0
Total $ 481,611
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 1.05%
After Five Years through Ten Years 0.00%
After Ten Years 0.00%
Total 1.05%
U.S. government-sponsored enterprises debt securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 0
After Five Years through Ten Years 280,289
After Ten Years 719,566
Total 999,855
Fair value  
Within One Year 0
After One Year through Five Years 0
After Five Years through Ten Years 240,780
After Ten Years 565,561
Total $ 806,341
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 0.00%
After Five Years through Ten Years 1.92%
After Ten Years 1.89%
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 0
After Five Years through Ten Years 95,693
After Ten Years 1,182,934
Total 1,278,627
Fair value  
Within One Year 0
After One Year through Five Years 0
After Five Years through Ten Years 81,608
After Ten Years 978,518
Total $ 1,060,126
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 0.00%
After Five Years through Ten Years 1.56%
After Ten Years 1.67%
Total 1.66%
Municipal securities  
Amortized cost  
Within One Year $ 0
After One Year through Five Years 0
After Five Years through Ten Years 0
After Ten Years 189,507
Total 189,507
Fair value  
Within One Year 0
After One Year through Five Years 0
After Five Years through Ten Years 0
After Ten Years 154,596
Total $ 154,596
Weighted Average Yield  
Within One Year 0.00%
After One Year through Five Years 0.00%
After Five Years through Ten Years 0.00%
After Ten Years 1.98%
Total 1.98%