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Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) security	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) security
Investment securities total	$ 1,300,000		$ 1,000,000
Available-for-sale Securities	634,376		527,547
Held-to-maturity securities	706,912		$ 533,108
Purchases of available-for-sale securities	142,245	$ 106,554
Maturities and paydowns of available-for-sale securities	48,436	45,662
Sales of available-for-sale securities	$ 0	0
Number of securities | security	176		180
Purchases of held-to-maturity securities	$ 190,624	0
Maturities and paydowns of held-to-maturity securities	$ 17,027	$ 14,367
Number of held-to-maturity securities in unrealized loss positions | security	140		160
Held-to-maturity investment securities pledged as collateral	$ 539,800		$ 500,500
Held-to-maturity investment securities held as collateral	0		0
Accrued interest receivable from available-for-sale investment securities	1,600		1,300
Accrued interest receivable from held-to-maturity investment securities	2,000		900
Other securities investments with no contractual maturity
Securities with no stated contractual date, amortized cost	700
Securities with no stated contractual date, fair value	700
Asset Pledged as Collateral
Available-for-sale Securities	0		0
Asset Pledged as Collateral | Federal Funds Purchased
Available-for-sale Securities	$ 245,400		$ 238,600
Financing Receivable, Pledging Purpose [Extensible Enumeration]	Noninterest-bearing Deposit Liabilities		Noninterest-bearing Deposit Liabilities

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