Parent Company Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash	$ 229,666	$ 197,823
Other assets	304,716	159,429
Total Assets	8,967,897	8,764,649
LIABILITIES
Other liabilities	164,721	119,723
Total Liabilities	7,813,186	7,572,651
Total Shareholders’ Equity	1,154,711	1,191,998	$ 935,761	$ 884,031
Total Liabilities and Shareholders’ Equity	8,967,897	8,764,649
Parent Company
ASSETS
Cash	6,585	7,509
Investments in bank subsidiary	1,168,831	1,198,964
Investments in nonbank subsidiaries	10,493	16,393
Other assets	8,614	9,741
Total Assets	1,194,523	1,232,607
LIABILITIES
Long-term debt	39,317	39,277
Other liabilities	495	1,332
Total Liabilities	39,812	40,609
Total Shareholders’ Equity	1,154,711	1,191,998
Total Liabilities and Shareholders’ Equity	$ 1,194,523	$ 1,232,607