Business Combinations - Business Acquisition, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net interest income	$ 54,522	$ 33,919
Provision for credit losses	(43,786)	(212)
Non-interest income	1,677	28,058
Non-interest expense	(43,768)	(24,866)
Income before income taxes	(28,092)	14,005
Income tax benefit (expense)	5,610	(2,523)
Pro Forma [Member]
Net interest income	53,380	52,460
Provision for credit losses	(17,831)	(273)
Non-interest income	17,281	16,796
Non-interest expense	(41,141)	(43,946)
Income before income taxes	11,689	25,037
Income tax benefit (expense)	(2,734)	(4,498)
Net income (loss)	$ 8,955	$ 20,539
Diluted earnings per share	$ 0.24	$ 0.54