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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Total available-for-sale debt securities, Amortized Cost, Within one year | $ 205,481 |
Total available-for-sale debt securities, Amortized Cost, After 1 year through 5 years | 324,674 |
Total available-for-sale debt securities, Amortized Cost, After 5 years through 10 years | 357,585 |
Total available-for-sale debt securities, Amortized Cost, After 10 years | 2,582,597 |
Available-for-sale, Amortized Cost | 3,470,337 | $ 2,541,107
Total held-to-maturity debt securities, Amortized Cost, Within one year | 28,720 |
Total held-to-maturity debt securities, Amortized Cost, After 1 year through 5 years | 230,302 |
Total held-to-maturity debt securities, Amortized Cost, After 5 years through 10 years | 552,366 |
Total held-to-maturity debt securities, Amortized Cost, After 10 years | 339,132 |
Held-to-maturity, Amortized Cost | 1,150,520 | 1,152,906
Total debt securities, Amortized Cost | 4,620,857 | 3,694,013
Total available-for-sale debt securities, Fair Value, Within one year | 205,633 |
Total available-for-sale debt securities, Fair Value, After 1 year through 5 years | 317,261 |
Total available-for-sale debt securities, Fair Value, After 5 years through 10 years | 331,930 |
Total available-for-sale debt securities, Fair Value, After 10 years | 2,413,192 |
Total available-for-sale debt securities, Fair Value | 3,268,016 | 2,246,072
Total held-to-maturity debt securities, Fair Value, Within one year | 28,726 |
Total held-to-maturity debt securities, Fair Value, After 1 year through 5 years | 226,475 |
Total held-to-maturity debt securities, Fair Value, After 5 years through 10 years | 500,885 |
Total held-to-maturity debt securities, Fair Value, After 10 years | 286,417 |
Total held-to-maturity debt securities, Fair Value | 1,042,503 | 1,006,817
Total debt securities, Fair Value | $ 4,310,519 | $ 3,252,889

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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- Definition Amortized cost and fair value debt securities. + References No definition available. + Details
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