PARENT COMPANY FINANCIALS ONLY (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Assets:
Total assets	$ 6,364,912		$ 6,099,234
Liabilities and stockholders’ equity
Junior subordinated debentures	73,685		73,906
Subordinated Debt	65,000		30,000
Derivative instruments	225,824		225,648
Other liabilities	107,264		72,788
Total liabilities	5,724,385		5,507,694
Stockholders’ equity	640,527		591,540		529,320	469,057
Total liabilities and stockholders' equity	6,364,912		6,099,234
Parent Company [Member]
Assets:
Cash	64,791	[1]	16,855
Investments in subsidiaries	691,406	[2]	661,257	[2]
Prepaid income taxes	285
Deferred tax asset	2,620		3,777
Deferred stock issuance costs	467		201
Total assets	759,569		682,090
Liabilities and stockholders’ equity
Dividends payable	5,761		5,243
Short-term borrowings			5,000
Junior subordinated debentures	73,685		73,906
Subordinated Debt	35,000
Accrued Income Taxes			8
Derivative instruments	4,187	[1]	6,303	[1]
Other liabilities	409		90
Total liabilities	119,042		90,550
Stockholders’ equity	640,527		591,540
Total liabilities and stockholders' equity	759,569		682,090
Consolidation, Eliminations [Member]
Assets:
Investments in subsidiaries	$ 689,200		$ 659,100

[1] Entire balance eliminates in consolidation.

[2] 689.2 million and $659.1 million eliminate in consolidation at December 31, 2014 and 2013, respectively.