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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amortized Cost |  |  |
Due in one year or less | $ 50,000 |  |
Due after one year through five years | 50,955 |  |
Due after five years through ten years | 480,806 |  |
Due after ten years | 1,905,679 |  |
Total | 2,487,440 | $ 2,683,241 |
Fair Value |  |  |
Due in one year or less | 49,222 |  |
Due after one year through five years | 46,440 |  |
Due after five years through ten years | 414,831 |  |
Due after ten years | 1,574,243 |  |
Fair Value | 2,084,736 | 2,250,168 |
Amortized Cost |  |  |
Due in one year or less | 158,338 |  |
Due after one year through five years | 267,073 |  |
Due after five years through ten years | 1,343,076 |  |
Due after ten years | 3,792,519 |  |
Amortized Cost | 5,561,006 | 6,216,141 |
Fair Value |  |  |
Due in one year or less | 156,418 |  |
Due after one year through five years | 254,908 |  |
Due after five years through ten years | 1,165,142 |  |
Due after ten years | 3,207,920 |  |
Fair Value | 4,784,388 | 5,326,822 |
Information with respect to sales of held-to-maturity |  |  |
Proceeds from sales of investment securities held to maturity | 0 | 0 | $ 0
Information with respect to sales of available-for-sale securities |  |  |
Sale proceeds | 129,614 | 482,028 | 151,314
Gross realized gains | 1,335 | 103 | 750
Gross realized losses | 1,292 | 73 | 648
Net realized gain | $ 43 | $ 30 | $ 102

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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-11 + Details
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