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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Federal Reserve and Federal Home Loan Bank stock	$ 54,274		$ 54,274		$ 25,748
Provision for credit losses - HTM debt securities	55	$ 2	56	$ 1,244
Provision for credit losses - AFS debt securities	0	(14)	0	0
Allowance for credit losses	17		17		17
HTM Allowance for credit losses	2,012		2,012		$ 1,956
Debt securities, available-for-sale, realized gain	3	2	7	7
Debt securities, available-for-sale, realized loss	0	0	0	(26)
Gross proceeds from sales and calls	$ 50	$ 273	$ 27,100	$ 8,600
Holdings of securities of any one issuer	10.00%		10.00%		10.00%
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 2,200,000		$ 2,200,000		$ 2,100,000
Other Assets
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available for sale securities	7,300		7,300		7,600
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Unrealized loss			48,200		51,700
Allowance for credit losses	$ 0		$ 0		$ 0

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Percent of holdings of securities of any one issuer, other than the U.S. Government and U.S. agency securities, which exceeded shareholders equity.

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