Parent Company Parent Company Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 224,640	$ 164,396	$ 305,514	$ 204,625
Money Market Funds, at Carrying Value	122	451
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	1,982,523	1,520,237
Loans, net of deferred loan fees and costs	11,112,854	8,398,265
Repossessed Assets	43,942	57,150	66,719	77,247
Other assets	273,976	198,696
Assets	14,275,089	10,600,498
Other borrowings	150,000	390,263
Liabilities	12,683,587	9,599,570
Stockholders' equity	1,591,502	1,000,928	855,498	759,421
Liabilities and Equity	14,275,089	10,600,498
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	7,627	11,855	$ 7,128	$ 15,712
Money Market Funds, at Carrying Value	122	451
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	50,507	51,335
Investments in and Advance to Bank Subsidiaries	1,522,245	987,882
Investments in and Advance to Non Bank Subsidiaries	2,424	9,827
Loans, net of deferred loan fees and costs	35,635	39,221
Repossessed Assets	14,471	16,318
Other assets	19,378	9,912
Assets	1,652,409	1,126,801
Other borrowings	0	83,182
Accrued Liabilities and Other Liabilities	2,537	2,254
Junior Subordinated Notes	58,370	40,437
Liabilities	60,907	125,873
Stockholders' equity	1,591,502	1,000,928
Liabilities and Equity	$ 1,652,409	$ 1,126,801