Parent Company Condensed Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Information [Line Items]
Cash	$ 139,486	$ 99,399	$ 109,580	$ 108,356
Other assets	102,166	102,583
Total Assets	6,943,053	6,318,354
Other liabilities	57,556	68,758
Total Liabilities	6,101,097	5,526,117
Total Shareholders' Equity	841,956	792,237	608,389	571,306
Total Liabilities and Shareholders’ Equity	6,943,053	6,318,354
Parent Company
Condensed Financial Information [Line Items]
Cash	17,057	12,595	$ 38,028	$ 14,852
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	819,531	777,795
Nonbank subsidiaries	21,980	20,624
Other assets	4,694	2,530
Total Assets	863,262	813,544
Long-term debt	20,619	20,619
Other liabilities	687	688
Total Liabilities	21,306	21,307
Total Shareholders' Equity	841,956	792,237
Total Liabilities and Shareholders’ Equity	$ 863,262	$ 813,544