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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

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Securities - Amortized cost and fair value by contractual maturity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Amortized Cost
Due after one year through five years	$ 56,378
Due after five years through ten years	409,257
Due after ten years	1,730,345
Total	2,195,980		$ 2,254,670
Fair Value
Due after one year through five years	51,887
Due after five years through ten years	356,482
Due after ten years	1,412,104
Fair Value	1,820,473		1,834,527
Amortized Cost
Due in one year or less	49,944
Due after one year through five years	202,653
Due after five years through ten years	738,102
Due after ten years	5,367,728
Amortized Cost	6,358,427		5,129,216
Fair Value
Due in one year or less	49,711
Due after one year through five years	198,349
Due after five years through ten years	679,180
Due after ten years	4,926,129
Fair Value	5,853,369		$ 4,320,593
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
Sale proceeds	2,874,110
Gross realized gains	8,892
Gross realized losses	(237,703)
Net realized losses	(228,811)
Sold securities	1,800,000	$ 0
Realized gains or losses	0
Sales of Securities Acquired from Independent
Information with respect to sales of available-for-sale securities
Sale proceeds	1,279,717
Investment Securities Sales
Information with respect to sales of available-for-sale securities
Sale proceeds	1,594,393
Gross realized gains	8,892
Gross realized losses	(237,703)
Net realized losses	$ (228,811)