Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Designated as Hedging Instrument
Derivative [Line Items]
Assets	$ 2,214	$ 11,764
Liabilities	27,749	47,859
Designated as Hedging Instrument | Cash flow hedges | Interest rate collars and floors on loan pools
Derivative [Line Items]
Notional	1,500,000	1,900,000
Assets	2,214	11,764
Liabilities	27,749	47,859
Designated as Hedging Instrument | Cash flow hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	150,000	150,000
Assets	0	0
Liabilities	0	0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on borrowings
Derivative [Line Items]
Notional	700,000	300,000
Assets	0	0
Liabilities	0	0
Designated as Hedging Instrument | Fair value hedges | Interest rate swaps on investment securities
Derivative [Line Items]
Notional	998,107	909,957
Assets	0	0
Liabilities	0	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Assets	225,619	157,237
Liabilities	381,520	332,845
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Notional	42,492	21,401
Assets	0	93
Liabilities	146	0
Not Designated as Hedging Instrument | Forward mortgage loan contracts
Derivative [Line Items]
Notional	54,730	30,330
Assets	1,031	32
Liabilities	0	0
Not Designated as Hedging Instrument | Customer interest rate swaps
Derivative [Line Items]
Notional	5,775,638	5,220,363
Assets	1,208	5,676
Liabilities	379,864	326,924
Not Designated as Hedging Instrument | Counterparty interest rate swaps
Derivative [Line Items]
Notional	5,775,634	5,220,363
Assets	222,907	151,111
Liabilities	1,213	5,711
Not Designated as Hedging Instrument | Customer foreign currency contracts
Derivative [Line Items]
Notional	13,234	8,341
Assets	218	253
Liabilities	156	42
Not Designated as Hedging Instrument | Counterparty foreign currency contracts
Derivative [Line Items]
Notional	12,970	8,297
Assets	255	72
Liabilities	$ 141	$ 168