PARENT COMPANY FINANCIALS ONLY (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Deferred tax asset		$ 47,829		$ 49,424
Total assets		7,210,038		6,364,912
Liabilities and stockholders’ equity
Junior subordinated debentures		73,464		73,685
Subordinated Debt		35,000		65,000
Derivative instruments		160,270		225,824
Other liabilities		103,370		107,264
Total liabilities		6,438,575		5,724,385
Stockholders’ equity		771,463		640,527	$ 591,540	$ 529,320
Liabilities and Equity		7,210,038		6,364,912
Parent Company [Member]
Assets:
Cash		35,428	[1]	64,791
Investments in subsidiaries	[2]	851,743		691,406
Prepaid income taxes		530		285
Deferred tax asset		2,229		2,620
Deferred stock issuance costs		569		467
Total assets		890,499		759,569
Liabilities and stockholders’ equity
Dividends payable		6,824		5,761
Junior subordinated debentures		73,464		73,685
Subordinated Debt		35,000		35,000
Derivative instruments	[1]	2,109		4,187
Other liabilities		1,639		409
Total liabilities		119,036		119,042
Stockholders’ equity		771,463		640,527
Liabilities and Equity		890,499		759,569
Consolidation, Eliminations [Member]
Assets:
Investments in subsidiaries		$ 849,500		$ 689,200

[1] Entire balance eliminates in consolidation.

[2] $849.5 million and $689.2 million eliminate in consolidation at December 31, 2015 and 2014, respectively.