Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities:
Net Income	$ 61,819	$ 39,531
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	10,043	7,179
Depreciation and amortization	8,117	3,514
Gains on sale of loans	(9,364)	(4,686)
Securities premium amortization (discount accretion), net	2,304	2,638
Origination of loans held for sale	(726,230)	(384,890)
Proceeds from sale of loans held for sale	744,198	390,352
Net increase in cash surrender value of BOLI	(1,191)	(919)
(Increase) decrease in deferred income taxes	(2,915)	3,146
Decrease in fair value of other real estate owned	750	589
Net loss on sale of other real estate owned	209	138
Net gain on sale of investment securities	(2,224)	(10)
Loss on early extinguishment of debt	1,130
Stock-based compensation expense	3,660	2,948
Excess tax benefits from stock-based compensation	(1,945)	(338)
Increase in other assets	(4,149)	(11,150)
Decrease in other liabilities	5,475	(7,995)
Net cash provided by operating activities	89,687	40,047
Cash Flows From Investing Activities:
Decrease in interest bearing deposits with other banks and short-term investments	374	26
Purchases of available for sale investment securities	(241,280)	(47,219)
Proceeds from maturities of available for sale securities	32,021	27,602
Proceeds from sale/call of available for sale securities	65,790	17,485
Purchases of Federal Reserve and Federal Home Loan Bank stock	(2,405)	(84)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	8,100	699
Net increase in loans	(472,089)	(491,336)
Proceeds from sale of other real estate owned	1,846	205
Purchases of BOLI	(499)
Purchases of annuities	(992)
Bank premises and equipment acquired	(2,053)	(4,392)
Net cash used in investing activities	(611,187)	(497,014)
Cash Flows From Financing Activities:
Increase in deposits	615,820	308,436
Increase (decrease) in customer repurchase agreements	3,773	(21,514)
Issuance of common stock	94,633
Decrease in short-term borrowings	(100,000)
(Decrease) increase in long-term borrowings	(49,300)	70,000
Payment of dividends on preferred stock	(539)	(434)
Proceeds from exercise of stock options	4,640	1,089
Excess tax benefits from stock-based compensation	1,945	338
Payment in lieu of fractional shares	(4)
Proceeds from employee stock purchase plan	562	448
Net cash provided by financing activities	571,530	358,363
Net Increase (Decrease) In Cash and Cash Equivalents	50,030	(98,604)
Cash and Cash Equivalents at Beginning of Period	256,025	306,960
Cash and Cash Equivalents at End of Period	306,055	208,356
Supplemental Cash Flows Information:
Interest paid	15,800	8,646
Income taxes paid	38,550	24,750
Non-Cash Investing Activities
Transfers from loans to other real estate owned	1,725	$ 330
Transfers from other real estate owned to loans	$ 2,192