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Derivatives - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2024
USD ($)
derivative
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
derivative
Derivatives, Fair Value [Line Items]      
Number of fixed portfolio layer method fair value swaps | derivative 5   5
Amortization adjustment $ 17.2    
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest income    
Realized and unrealized gain (loss) included in earnings $ 0.0 $ (0.1)  
Fair value hedge      
Derivatives, Fair Value [Line Items]      
Notional Amount 432.8    
Fixed rate mortgages      
Derivatives, Fair Value [Line Items]      
Number of fixed portfolio layer method fair value swaps | derivative     4
Fixed rate bonds      
Derivatives, Fair Value [Line Items]      
Number of fixed portfolio layer method fair value swaps | derivative     1
Embedded derivative      
Derivatives, Fair Value [Line Items]      
Fair value of embedded derivative $ 0.6   $ 0.6