Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 1,494,514	$ 342,537
Deposits	14,437,648	15,087,160
Federal funds purchased and securities sold under repurchase agreements	449,331	238,577
Other borrowings	1,050,938	91,025
Subordinated notes	123,262	123,042
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	738,787	2,266,829
Securities held to maturity	1,494,514	342,537
Deposits	14,437,648	15,087,160
Federal funds purchased and securities sold under repurchase agreements	449,331	238,577
Other borrowings	1,050,938	91,025
Subordinated notes	123,262	123,042
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	738,787	2,266,829
Securities held to maturity	1,406,589	353,511
Deposits	14,404,661	15,084,440
Federal funds purchased and securities sold under repurchase agreements	449,331	238,577
Other borrowings	1,050,932	91,022
Subordinated notes	113,125	128,438
Junior subordinated debt securities	46,392	49,485
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI and PPP loans	12,083,825	10,181,708
Level 3 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI and PPP loans	$ 11,850,318	$ 10,123,379