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Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income:
Income before provision for income taxes	$ 230,425	$ 224,255	$ 168,805
Applicable income tax benefit	(43,942)	(45,384)	(81,251)
Net income	186,483	178,871	87,554
Parent company | Reportable Legal Entities
Income:
Dividends from subsidiary	214,852	117,298	63,703
Operating income	5,386	67	580
Total income	220,238	117,365	64,283
Operating expenses	15,409	15,302	15,482
Income before provision for income taxes	204,829	102,063	48,801
Applicable income tax benefit	1,883	3,055	5,053
Equity in undistributed earnings of subsidiary (excess distribution)	(20,229)	73,753	33,700
Net income	$ 186,483	$ 178,871	$ 87,554

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