Goodwill and Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) $ / loans Rate	Dec. 31, 2020 USD ($) $ / loans Rate	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning goodwill	$ 350,298	$ 349,398
Goodwill, Out Of Period Adjustment	(4,234)	0
Ending goodwill	346,064	350,298	$ 349,398
Servicing Asset at Amortized Cost	23,357	18,426	22,963	$ 21,396
Servicing Asset at Amortized Cost, Additions	10,556	8,006	6,149
Amortization	(8,727)	(8,400)	(6,233)
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries)	(3,102)	4,143	222
Residential Mortgage Loans Serviced	$ 3,390,000	$ 3,310,000	3,380,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate	15.69%	20.62%
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 8,600	$ 8,500	7,900
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans	87.58	87.58
Useful life (years)	5 years 7 months 6 days
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 29,667	$ 43,386
Amortization	(10,948)	(14,255)
Ending balance	18,719	29,667	43,386
Finite-Lived Intangible Assets [Abstract]
Gross balance	127,842	127,842
Accumulated amortization	(109,123)	(98,175)
Carrying value	18,719	29,667
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Asset, Expected Amortization, Year One		7,743
Finite-Lived Intangible Asset, Expected Amortization, Year Two		5,129
Finite-Lived Intangible Asset, Expected Amortization, Year Three		2,659
Finite-Lived Intangible Asset, Expected Amortization, Year Four		1,374
Finite-Lived Intangible Asset, Expected Amortization, Year Five		1,814
Community Financial Holding Co. Inc.
Goodwill [Roll Forward]
Goodwill acquired	0	686
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	0	536
Entegra Financial
Goodwill [Roll Forward]
Business combination, measurement period adjustment, amount	0	214
Servicing Asset at Amortized Cost, Additions	$ 0	$ 0	$ 1,873
Conventional fixed loans
Goodwill [Roll Forward]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate	8.51%	7.92%
All loans and leases excluding conventional fixed loans [Member]
Goodwill [Roll Forward]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate	9.51%	8.92%