Business Combinations - Pro-forma Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pro-forma information
Bargain purchase gain			$ 30,728
ANH
Pro-forma information
Interest income	$ 415,245	$ 341,733
Interest expense	(217,089)	(220,370)
Recovery of (provision for) loan losses	(8,049)	(35,394)
Non-interest income	322,477	399,075
Non-interest expense	(318,391)	(570,884)
Income (loss) before provision for income taxes	194,193	(85,840)
Income tax benefit (expense)	(29,083)	(8,385)
Net income (loss)	165,110	$ (94,225)
Nonrecurring transaction costs excluded from pro forma non-interest expense	$ 7,800