Acquisitions - Pro forma information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Supplemental consolidated pro forma revenue	$ 771,289	$ 622,848	$ 636,079
Supplemental consolidated pro forma net income	279,568	164,284	210,232
Aquesta
Business Acquisition [Line Items]
Actual revenue included since acquisition date	2,122
Actual net income included since acquisition date	(282)
FinTrust
Business Acquisition [Line Items]
Actual revenue included since acquisition date	4,326
Actual net income included since acquisition date	$ (26)
Three Shores
Business Acquisition [Line Items]
Actual revenue included since acquisition date		24,541
Actual net income included since acquisition date		$ 6,800
FMBT
Business Acquisition [Line Items]
Actual revenue included since acquisition date			7,525
Actual net income included since acquisition date			$ 4,053