Derivative Financial Instruments - Customer-related derivative positions (Details) $ in Thousands	Sep. 30, 2023 USD ($) position	Dec. 31, 2022 USD ($) position
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Total Notional	$ 2,400,000	$ 2,400,000
Interest rate swaps | Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions | position	376	382
Total Notional	$ 2,478,858	$ 2,404,003
Risk participation agreements | Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions | position	73	63
Total Notional	$ 267,812	$ 241,029
Matched commercial customer book | Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions | position	92	32
Total Notional	$ 45,145	$ 7,877
Foreign currency loan | Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions | position	6	5
Total Notional	$ 11,553	$ 13,948