Parent Company Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Assets	$ 674,189	$ 568,329
Assets	8,558,377	7,804,308	$ 7,537,620
Long-term Debt	192,500	400,000
Subordinated Debt	15,000	15,000
Other Liabilities	98,594	73,976
Total liabilities	7,589,363	6,971,802
Total liabilities and shareholders’ equity	8,558,377	7,804,308
Parent Company
Cash	73,663	75,094	$ 79,452	$ 112,067
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	912,162	727,227
Debentures Receivable From Subsidiary Banks	25,000	25,000
Due from Other Related Parties, Current	9,168	546
Other Investments	5,001	6,619
Other Assets	20,620	20,518
Assets	1,045,614	855,004
Long-term Debt	42,500	0
Subordinated Debt	15,000	15,000
Accounts Payable, Related Parties	10,092	101
Other Liabilities	9,008	7,397
Total liabilities	76,600	22,498
Stockholders' Equity Attributable to Parent	969,014	832,506
Total liabilities and shareholders’ equity	$ 1,045,614	$ 855,004