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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Due in One Year or Less | $ 126,490 |
Due After One Year Through Five Years | 690,513 |
Due After Five Years Through Ten Years | 150,762 |
Amortized Cost, Total | 967,765 |
Available-for-Sale: Amortized Cost | 3,460,563 | $ 2,947,415
Fair Value |  |
Due in One Year or Less | 125,203 |
Due After One Year Through Five Years | 672,931 |
Due After Five Years Through Ten Years | 139,926 |
Fair Value, Total | 938,060 |
Available-for-Sale: Fair Value | 3,280,410 | 2,689,528
Amortized Cost |  |
Due in One Year or Less | 5,000 |
Due After One Year Through Five Years | 74,857 |
Due After Five Year Through Ten Years | 59,892 |
Amortized Cost, Total | 139,749 |
Held-to-Maturity: Amortized Cost | 4,340,032 | 4,618,543
Fair Value |  |
Due in One Year or Less | 4,970 |
Due After One Year Through Five Years | 70,682 |
Due After Five Year Through Ten Years | 52,663 |
Fair Value, Total | 128,315 |
Held-to-Maturity: Fair Value | 3,717,573 | 3,820,882
Debt Securities Issued by Government Agencies |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 104,012 |
Fair Value |  |
Available-for-sale Securities, Fair Value | 103,740 |
Total Collateralized Mortgage Obligations |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 1,707,390 |
Available-for-Sale: Amortized Cost | 1,707,390 | 1,356,995
Fair Value |  |
Available-for-sale Securities, Fair Value | 1,601,375 |
Available-for-Sale: Fair Value | 1,601,375 | 1,218,694
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,451,264 |
Held-to-Maturity: Amortized Cost | 2,451,264 | 2,601,599
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,079,354 |
Held-to-Maturity: Fair Value | 2,079,354 | 2,132,242
Residential - Government Agencies or Sponsored Agencies |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 1,295,644 |
Available-for-Sale: Amortized Cost | 1,295,644 | 1,050,299
Fair Value |  |
Available-for-sale Securities, Fair Value | 1,210,591 |
Available-for-Sale: Fair Value | 1,210,591 | 935,220
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,041,489 |
Held-to-Maturity: Amortized Cost | 2,041,489 | 2,185,210
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,750,121 |
Held-to-Maturity: Fair Value | 1,750,121 | 1,808,064
Commercial - Government Agencies or Sponsored Agencies |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 351,102 |
Available-for-Sale: Amortized Cost | 351,102 | 306,696
Fair Value |  |
Available-for-sale Securities, Fair Value | 330,185 |
Available-for-Sale: Fair Value | 330,185 | 283,474
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 409,775 |
Held-to-Maturity: Amortized Cost | 409,775 | 416,389
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 329,233 |
Held-to-Maturity: Fair Value | 329,233 | 324,178
Commercial - Non-Agency |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 60,644 |
Available-for-Sale: Amortized Cost | 60,644 |
Fair Value |  |
Available-for-sale Securities, Fair Value | 60,599 |
Available-for-Sale: Fair Value | 60,599 |
Total Mortgage-Backed Securities |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 681,396 |
Available-for-Sale: Amortized Cost | 681,396 | 555,092
Fair Value |  |
Available-for-sale Securities, Fair Value | 637,235 |
Available-for-Sale: Fair Value | 637,235 | 484,764
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,749,019 |
Held-to-Maturity: Amortized Cost | 1,749,019 | 1,874,586
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,509,904 |
Held-to-Maturity: Fair Value | 1,509,904 | 1,563,365
Residential - Government Agencies or Sponsored Agencies |  |
Amortized Cost |  |
Available-for-sale Securities: Amortized Cost | 681,396 |
Available-for-Sale: Amortized Cost | 681,396 | 555,092
Fair Value |  |
Available-for-sale Securities, Fair Value | 637,235 |
Available-for-Sale: Fair Value | 637,235 | 484,764
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,739,033 |
Held-to-Maturity: Amortized Cost | 1,739,033 | 1,864,591
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,501,644 |
Held-to-Maturity: Fair Value | 1,501,644 | 1,555,535
Commercial - Government Agencies or Sponsored Enterprises |  |
Amortized Cost |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 9,986 |
Held-to-Maturity: Amortized Cost | 9,986 | 9,995
Fair Value |  |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 8,260 |
Held-to-Maturity: Fair Value | $ 8,260 | $ 7,830

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