PARENT ONLY CONDENSED FINANCIAL STATEMENTS - Parent Only Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 67,578	$ 62,485	$ 61,320	$ 65,650
Securities available for sale	925,279	867,760
Total assets	3,385,408	3,122,516
Liabilities
Subordinated debentures	41,239	41,239
Other liabilities	14,183	11,532
Total liabilities	3,004,048	2,761,854
Shareholders' equity	381,360	360,662	305,526	323,751
Total liabilities and shareholders' equity	3,385,408	3,122,516
Parent Company
Assets
Cash and cash equivalents	14,846	6,322	$ 11,667	$ 7,102
Securities available for sale	149	149
Investment in subsidiaries	403,981	393,060
Other assets	9,586	5,490
Total assets	428,562	405,021
Liabilities
Subordinated debentures	41,239	41,239
Other liabilities	5,963	3,120
Total liabilities	47,202	44,359
Shareholders' equity	381,360	360,662
Total liabilities and shareholders' equity	$ 428,562	$ 405,021