Condensed Parent Company Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Premises and equipment	$ 120,502	$ 114,859
Other assets	52,179	59,605
Total assets	7,289,751	6,143,639
Liabilities and shareholders' equity
Trust preferred securities	61,829	300,671
Other liabilities	42,133	37,203
Total liabilities	6,396,330	5,291,238
Shareholders’ equity	893,421	852,401	$ 764,230	$ 692,979
Total liabilities and shareholders’ equity	7,289,751	6,143,639
Parent Company
Assets
Cash on deposit with bank subsidiary	15,284	2,014
Investment in wholly-owned subsidiaries, at equity	938,294	904,924
Premises and equipment	7	7
Other assets	(164)	5,642
Total assets	953,421	912,587
Liabilities and shareholders' equity
Trust preferred securities	54,200	54,049
Other liabilities	5,800	6,137
Total liabilities	60,000	60,186
Shareholders’ equity	893,421	852,401
Total liabilities and shareholders’ equity	$ 953,421	$ 912,587