Condensed Parent Company Statements - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Interest expense	$ 20,752	$ 40,565	$ 54,602
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Dividends from subsidiary bank	74,000	40,000	32,000
Other income		5
Loss on other investments			(23)
Total income	74,000	40,005	31,977
Operating expenses	2,121	2,197	2,044
Interest expense	7,613	7,459	5,397
Total expense	9,734	9,656	7,441
Income before income tax and equity in undistributed earnings of subsidiaries	64,266	30,349	24,536
Credit for income taxes	(1,850)	(1,800)	(1,381)
Income before equity in earnings of subsidiaries	66,116	32,149	25,917
Equity in undistributed earnings of subsidiaries	8,511	27,164	47,695
Net income	$ 74,627	$ 59,313	$ 73,612