Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities
Net Income	$ 42,769	$ 25,126
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	1,103	3,791
Amortization of purchase accounting adjustments, net	(2,695)	(5,430)
Provision for loan losses	14,905	5,345
Share-based compensation cost - equity awards	3,870	2,952
Loss (gain) on sale of assets, net	3	(16)
Gain on sale of available for sale securities	(196)	(386)
Gain on sale of OREO, net	(3,534)	(998)
Amortization of premium/discount on securities, net	4,871	3,815
(Benefit) expense for deferred income taxes	(4,698)	(62)
Originations of mortgage loans held for sale	(517,661)	(495,874)
Proceeds from sales of mortgage loans held for sale	507,372	456,278
Gain on sale of mortgage loans held for sale, net	(19,668)	(13,780)
Tax benefit associated with share-based payment arrangements	0	(252)
Change in other assets, net of other assets acquired	(3,800)	56,842
Other operating activities, net	20,530	6,396
Net Cash Provided by Operating Activities	43,171	43,747
Cash Flows from Investing Activities
Proceeds from sales of available for sale securities	49,531	40,887
Proceeds from maturities, prepayments and calls of available for sale securities	98,439	85,627
Purchases of available for sale securities	(68,609)	(121,876)
Proceeds from maturities, prepayments and calls of held to maturity securities	2,589	3,296
Purchases of equity securities	(21,569)	(475)
Reimbursement of recoverable covered asset losses (to) from the FDIC	(20)	632
Increase in loans, net of loans acquired	(114,232)	(71,686)
Proceeds from sale of premises and equipment	1,158	47
Purchases of premises and equipment, net of premises and equipment acquired	(4,600)	(1,837)
Proceeds from disposition of OREO	13,240	10,769
Cash paid for additional investment in tax credit entities	(5,617)	0
Cash received in excess of cash paid for acquisitions	0	325,444
Other investing activities, net	(750)	2,255
Net Cash (Used in) Provided by Investing Activities	(50,440)	273,083
Cash Flows from Financing Activities
Increase in deposits, net of deposits acquired	81,931	365,847
Net change in short-term borrowings, net of borrowings acquired	171,621	(242,368)
Proceeds from long-term debt	260,000	60,000
Repayments of long-term debt	(1,168)	(70,527)
Cash dividends paid on common stock	(13,988)	(11,374)
Cash dividends paid on preferred stock	(2,576)	0
Proceeds from common stock transactions	17	3,087
Payments to repurchase common stock	(2,180)	(2,552)
Tax benefit associated with share-based payment arrangements	0	252
Net Cash Provided by Financing Activities	493,657	102,365
Net Increase in Cash and Cash Equivalents	486,388	419,195
Cash and Cash Equivalents at Beginning of Period	510,267	548,095
Cash and Cash Equivalents at End of Period	996,655	967,290
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	1,937	4,821
Common stock issued in acquisitions	0	289,504
Supplemental Disclosures Cash Paid For
Income taxes, net	14,703	11,988
Income taxes, net	$ 4,150	$ 900