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Investment Securities - Narrative (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
Investment securities total $ 1,300,000   $ 1,400,000
Securities with no stated contractual date, amortized cost 800    
Securities with no stated contractual date, fair value 800    
Amortized cost 772,243   819,762
Available-for-sale Securities 659,347   706,289
Held-to-maturity securities 619,400   $ 651,527
Purchases of available-for-sale securities 0 $ 260,246  
Maturities and paydowns of available-for-sale securities 47,550 79,103  
Sales of available-for-sale securities $ 0 0  
Number of securities | security 241   244
Purchases of held-to-maturity securities $ 2,452 44,309  
Maturities and paydowns of held-to-maturity securities $ 34,891 $ 69,734  
Number of held-to-maturity securities in unrealized loss positions | security 155   129
Held-to-maturity investment securities pledged as collateral $ 613,500   $ 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
Accrued interest receivable from available-for-sale investment securities $ 1,400   $ 1,500
Accrued interest receivable from held-to-maturity investment securities 1,000   1,100
Asset Pledged as Collateral      
Available-for-sale Securities 0   0
Asset Pledged as Collateral | Federal Funds Purchased [Member]      
Available-for-sale Securities $ 203,000   $ 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