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Securities - Additional disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Additional disclosures
Carrying value of investment securities pledged to secure public funds deposits and for other purposes required and permitted by law	$ 2,600,000	$ 2,100,000
Carrying amount of the securities pledged to collateralize repurchase agreements	8,189,780	7,173,947
Asset Pledged as Collateral [Member]
Additional disclosures
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 443,200	$ 471,300
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Federal Funds Purchased	Federal Funds Purchased

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- References

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for public funds deposits and for other purposes required and permitted by law, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

No definition available.

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- Definition

Indicates pledging purpose of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
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