Loans - Schedule of Loans in Deferral (Details) - Paycheck Protection Program $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 1,077,043
Percentage on payment deferral	21.00%
Construction and land development
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 14,488
Percentage on payment deferral	5.00%
Commercial real estate - owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 320,406
Percentage on payment deferral	30.00%
Commercial real estate - non owner-occupied
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 445,311
Percentage on payment deferral	32.00%
Residential real estate
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 148,035
Percentage on payment deferral	10.00%
Commercial and financial
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 130,877
Percentage on payment deferral	17.00%
Consumer
Financing Receivable, Nonaccrual [Line Items]
Value of loans deferred, not classified as TDRs	$ 17,926
Percentage on payment deferral	9.00%