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Investment Securities - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
security
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
Investment securities total $ 1,300,000   $ 1,200,000
Securities with no stated contractual date, fair value 74,600    
Amortized cost 788,730   727,819
Available-for-sale Securities 685,666   628,829
Held-to-maturity securities 570,850   $ 585,052
Purchases of available-for-sale securities 106,554 $ 0  
Maturities and paydowns of available-for-sale securities 45,662 22,502  
Sales of available-for-sale securities $ 0 0  
Number of securities | security 231   230
Purchases of held-to-maturity securities $ 0 2,451  
Maturities and paydowns of held-to-maturity securities $ 14,367 $ 16,201  
Number of held-to-maturity securities in unrealized loss positions | security 155   123
Held-to-maturity investment securities pledged as collateral $ 543,200   $ 559,300
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
Accrued interest receivable from available-for-sale investment securities $ 1,600   $ 1,300
Accrued interest receivable from held-to-maturity investment securities 1,300   1,000
Asset Pledged as Collateral | Federal Funds Purchased [Member]      
Available-for-sale Securities $ 301,200   $ 312,400
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities
Other Securities Investments With No Contractual Maturity      
Securities with no stated contractual date, amortized cost $ 800    
Securities with no stated contractual date, fair value $ 800