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Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) security
Investment securities total	$ 1,300,000		$ 1,400,000
Amortized cost	797,271		819,762
Available-for-sale Securities	695,485		706,289
Held-to-maturity securities	637,921		$ 651,527
Purchases of available-for-sale securities	0	$ 179,369
Maturities and paydowns of available-for-sale securities	22,502	39,108
Sales of available-for-sale securities	$ 0	0
Number of securities | security	238		244
Purchases of held-to-maturity securities	$ 2,451	0
Maturities and paydowns of held-to-maturity securities	$ 16,201	$ 41,422
Number of held-to-maturity securities in unrealized loss positions | security	111		129
Held-to-maturity investment securities pledged as collateral	$ 590,600		$ 355,300
Held-to-maturity investment securities held as collateral	$ 0		$ 0
Type of held-to-maturity investment securities collateral	Asset Pledged as Collateral		Asset Pledged as Collateral
Asset Pledged as Collateral | Federal Funds Purchased [Member]
Available-for-sale Securities	$ 267,600		$ 484,900
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Noninterest-bearing Deposit Liabilities		Noninterest-bearing Deposit Liabilities
Asset Pledged as Collateral | Federal Home Loan Bank Advances [Member]
Available-for-sale Securities	$ 0		$ 0
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Noninterest-bearing Deposit Liabilities		Noninterest-bearing Deposit Liabilities
Available-for-Sale Securities [Member]
Accrued interest receivable	$ 1,400		$ 1,500
Held-to-Maturity Securities [Member]
Accrued interest receivable	1,400		$ 1,100
Other Securities Investments With No Contractual Maturity
Available-for-sale Securities	$ 800

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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