Other Income and Other Operating Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Professional services	$ 18,688	$ 16,897	$ 16,685
Postage	7,538	6,363	5,785
Telephone	8,833	7,685	5,947
Credit card expense	18,960	16,163	14,338
Marketing	19,396	16,499	8,410
Software and technology	39,724	25,146	15,558
Operating supplies	3,322	2,322	2,346
Amortization of intangibles	13,495	11,805	11,009
Branch right sizing expense	14,097	3,129	1,341
Other expense	29,907	32,843	30,156
Total other operating expenses	$ 173,960	$ 138,852	$ 111,575