PARENT COMPANY FINANCIALS ONLY (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Assets:
Total assets	$ 6,099,234		$ 5,756,985
Liabilities and stockholders’ equity
Junior subordinated debentures	73,906		74,127
Derivative instruments	225,648		249,929
Other liabilities	72,788		89,933
Total liabilities	5,507,694		5,227,665
Stockholders’ equity	591,540		529,320		469,057	436,472
Total liabilities and stockholders' equity	6,099,234		5,756,985
Parent Company [Member]
Assets:
Cash	16,855	[1]	18,535	[1]
Investments in subsidiaries	661,257	[2]	600,808	[2]
Prepaid income taxes			161
Deferred tax asset	3,777		4,602
Deferred stock issuance costs	201		267
Total assets	682,090		624,373
Liabilities and stockholders’ equity
Dividends payable	5,243
Short-term borrowings	5,000		12,000
Junior subordinated debentures	73,906		74,127
Accrued Income Taxes	8
Derivative instruments	6,303	[1]	8,834	[1]
Other liabilities	90		92
Total liabilities	90,550		95,053
Stockholders’ equity	591,540		529,320
Total liabilities and stockholders' equity	682,090		624,373
Consolidation, Eliminations [Member]
Assets:
Investments in subsidiaries	$ 659,100		$ 598,600

[1] Entire balance eliminates in consolidation.

[2] $659.1 million and $598.6 million eliminate in consolidation at December 31, 2013 and 2012, respectively.