PARENT COMPANY FINANCIAL DATA - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 90,566	$ 60,783
Investment securities available for sale	990,613	689,132
Deferred tax asset, net	72,577	59,850
Other assets	99,124	53,032
Total assets	7,215,630	4,474,144
Liabilities and Shareholders' Equity:
Long-term debt	159,424	194,967
Accrued interest payable and other liabilities	57,905	30,831
Total liabilities	6,201,399	3,911,595
Total liabilities and shareholders' equity	7,215,630	4,474,144
Parent Company
Assets:
Cash and cash equivalents	1,435	5,066	$ 2,825	$ 631
Investment securities available for sale	147	379
Investment in subsidiaries	1,109,634	619,144
Deferred tax asset, net	0	0
Other assets	108	2,660
Total assets	1,111,324	627,249
Liabilities and Shareholders' Equity:
Long-term debt	95,267	63,106
Accrued interest payable and other liabilities	1,826	1,594
Total liabilities	97,093	64,700
Total shareholders' equity before non-controlling interests	1,014,231	562,549
Total liabilities and shareholders' equity	$ 1,111,324	$ 627,249