Business Combinations - Pro-forma Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019
Pro-forma information
Bargain purchase gain				$ 30,728
Owens Realty Mortgage, Inc.
Pro-forma information
Interest income			$ 51,543
Interest expense			(36,323)
Provision for loan losses			(518)
Noninterest income			27,031
Noninterest expense			(37,721)
Income before provision for income taxes			4,012
Income tax benefit (provision)			2,996
Net income			7,008
Nonrecurring transaction costs excluded from pro forma non-interest expense			8,400
Bargain purchase gain	$ 30,728		$ 30,700
Knight Capital
Pro-forma information
Interest income		$ 57,034		105,787
Interest expense		(35,753)		(71,528)
Provision for loan losses		(1,348)		(1,866)
Noninterest income		48,623		120,548
Noninterest expense		(55,764)		(113,364)
Income before provision for income taxes		12,792		39,577
Income tax benefit (provision)		2,956		5,959
Net income		$ 15,748		$ 45,536