Securities - Scheduled Contractual Maturities of HTM Debt Securities (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Amortized cost
Within One Year	$ 0
After One Year through Five Years	538,743
After Five Years through Ten Years	466,105
After Ten Years	1,912,565
Total	2,917,413
Fair value
Within One Year	0
After One Year through Five Years	503,229
After Five Years through Ten Years	396,617
After Ten Years	1,487,908
Total	$ 2,387,754
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	1.79%
Total	1.66%
U.S. Treasury securities
Amortized cost
Within One Year	$ 0
After One Year through Five Years	535,080
After Five Years through Ten Years	0
After Ten Years	0
Total	535,080
Fair value
Within One Year	0
After One Year through Five Years	499,858
After Five Years through Ten Years	0
After Ten Years	0
Total	$ 499,858
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 agency and U.S. government-sponsored enterprise debt securities
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	371,825
After Ten Years	632,654
Total	1,004,479
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	316,243
After Ten Years	487,977
Total	$ 804,220
Weighted Average Yield
Within One Year	0.00%
After One Year through Five Years	0.00%
After Five Years through Ten Years	1.89%
After Ten Years	1.90%
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	3,663
After Five Years through Ten Years	94,280
After Ten Years	1,092,278
Total	1,190,221
Fair value
Within One Year	0
After One Year through Five Years	3,371
After Five Years through Ten Years	80,374
After Ten Years	859,389
Total	$ 943,134
Weighted Average Yield
Within One Year	0.00%
After One Year through Five Years	1.42%
After Five Years through Ten Years	1.62%
After Ten Years	1.69%
Total	1.68%
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	187,633
Total	187,633
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	0
After Ten Years	140,542
Total	$ 140,542
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	2.01%
Total	2.01%