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Investment Securities - Securities Pledged as Collateral (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 7,731,217	$ 8,189,780
Asset Pledged as Collateral [Member]
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	2,600	2,600
Asset Pledged as Collateral [Member] | Public Funds Deposits
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	1,800	1,900
Asset Pledged as Collateral [Member] | FHLB Advances
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	716,300	596,100
Asset Pledged as Collateral [Member] | Interest rate swap
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 108,300	$ 114,900

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481444/860-30-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(h))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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