Parent Company Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Assets	$ 691,631	$ 674,189
Assets	9,279,021	8,558,377	$ 7,804,308
Long-term Debt	32,500	192,500
Subordinated Debt	187,774	15,000
Other Liabilities	103,903	98,594
Total liabilities	8,238,765	7,589,363
Total liabilities and shareholders’ equity	9,279,021	8,558,377
Parent Company
Cash	248,814	73,663	$ 75,094	$ 79,452
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	969,054	912,162
Debentures Receivable From Subsidiary Banks	25,000	25,000
Due from Other Related Parties, Current	1,823	9,168
Other Investments	5,375	5,001
Other Assets	23,333	20,620
Assets	1,273,399	1,045,614
Long-term Debt	32,500	42,500
Subordinated Debt	187,774	15,000
Accounts Payable, Related Parties	132	10,092
Other Liabilities	12,737	9,008
Total liabilities	233,143	76,600
Stockholders' Equity Attributable to Parent	1,040,256	969,014
Total liabilities and shareholders’ equity	$ 1,273,399	$ 1,045,614