Parent Company Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash	$ 197,823	$ 155,489
Other assets	159,429	88,725
Total Assets	8,764,649	7,252,221
LIABILITIES
Other liabilities	119,723	38,222
Total Liabilities	7,572,651	6,316,460
Total Shareholders’ Equity	1,191,998	935,761	$ 884,031	$ 841,956
Total Liabilities and Shareholders’ Equity	8,764,649	7,252,221
Parent Company
ASSETS
Cash	7,509	8,869
Investments in bank subsidiary	1,198,964	925,286
Investments in nonbank subsidiaries	16,393	15,479
Other assets	9,741	8,458
Total Assets	1,232,607	958,092
LIABILITIES
Long-term debt	39,277	20,619
Other liabilities	1,332	1,712
Total Liabilities	40,609	22,331
Total Shareholders’ Equity	1,191,998	935,761
Total Liabilities and Shareholders’ Equity	$ 1,232,607	$ 958,092