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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Amortized Cost |  |  |
Due in one year or less | $ 64,365,000 |  |
Due after one year through five years | 36,550,000 |  |
Due after five years through ten years | 468,529,000 |  |
Due after ten years | 1,877,145,000 |  |
Total | 2,446,589,000 |  | $ 2,487,440,000
Fair Value |  |  |
Due in one year or less | 63,576,000 |  |
Due after one year through five years | 32,413,000 |  |
Due after five years through ten years | 399,174,000 |  |
Due after ten years | 1,521,404,000 |  |
Fair Value | 2,016,567,000 |  | 2,084,736,000
Amortized Cost |  |  |
Due in one year or less | 157,891,000 |  |
Due after one year through five years | 262,765,000 |  |
Due after five years through ten years | 1,295,555,000 |  |
Due after ten years | 3,712,383,000 |  |
Amortized Cost | 5,428,594,000 |  | 5,561,006,000
Fair Value |  |  |
Due in one year or less | 155,556,000 |  |
Due after one year through five years | 246,685,000 |  |
Due after five years through ten years | 1,111,329,000 |  |
Due after ten years | 3,084,830,000 |  |
Fair Value | 4,598,400,000 |  | $ 4,784,388,000
Information with respect to sales of held-to-maturity |  |  |
Proceeds from sales of investment securities held to maturity | $ 0 | $ 0 |
Information with respect to sales of available-for-sale securities |  |  |
Gross gains |  | 1,300,000 |
Gross losses |  | $ (1,300,000) |

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- Definition The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer. + 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://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 + Details
Name: | us-gaap_ProceedsFromSaleOfHeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration