Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 50,473	$ 42,769
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	2,199	1,103
Amortization Of Purchase Accounting And Market Value Adjustments	(6,958)	(2,695)
Provision for loan losses	6,154	14,905
Share-based compensation cost - equity awards	3,721	3,870
(Gain)/loss on sale of assets, net	54	3
(Gain)/loss on sale of available for sale securities	0	(196)
(Gain)/loss on sale of OREO, net	(800)	(3,534)
Amortization of premium/discount on securities, net	6,405	4,871
Unrealized Gain (Loss) on Derivatives	(69)	0
(Benefit) expense for deferred income taxes	(10,565)	(4,698)
Originations of mortgage loans held for sale	(393,924)	(517,661)
Proceeds from sales of mortgage loans held for sale	440,337	507,372
Realized and unrealized (gain)/loss on mortgage loans held for sale, net	(13,689)	(19,668)
Other operating activities, net	(20,864)	16,730
Net Cash Provided by Operating Activities	62,474	43,171
Cash Flows from Investing Activities
Proceeds from sales of available for sale securities	0	49,531
Proceeds from maturities, prepayments and calls of available for sale securities	113,940	98,439
Purchases of available for sale securities	(491,055)	(68,609)
Proceeds from maturities, prepayments and calls of held to maturity securities	2,968	2,589
Purchases of held to maturity securities	0	0
Purchases of equity securities	(200)	(21,569)
Increase in loans, net of loans acquired	(60,609)	(114,232)
Proceeds from sale of premises and equipment	7	1,158
Purchases of premises and equipment, net of premises and equipment acquired	(2,761)	(4,600)
Proceeds from disposition of OREO	4,374	13,240
Cash paid for investment in tax credit entities	(795)	(5,617)
Other investing activities, net	6,327	(770)
Net Cash Used in Investing Activities	(427,804)	(50,440)
Cash Flows from Financing Activities
Increase/(decrease) in deposits, net of deposits acquired	(95,916)	81,931
Net change in short-term borrowings, net of borrowings acquired	(60,440)	171,621
Proceeds from long-term debt	0	260,000
Repayments of long-term debt	(622)	(1,168)
Cash dividends paid on common stock	(16,126)	(13,988)
Cash dividends paid on preferred stock	(3,599)	(2,576)
Net share-based compensation stock transactions	(4,169)	17
Payments to repurchase common stock	0	(2,180)
Net proceeds from issuance of common stock	485,194	0
Net proceeds from issuance of preferred stock	0	0
Net Cash Provided by Financing Activities	304,322	493,657
Net Increase (Decrease) In Cash and Cash Equivalents	(61,008)	486,388
Cash and Cash Equivalents at Beginning of Period	1,362,126	510,267
Cash and Cash Equivalents at End of Period	1,301,118	996,655
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	2,733	1,937
Common stock issued in acquisition	0	0
Cash paid for:
Interest on deposits and borrowings	19,850	14,703
Income taxes, net	$ 39,609	$ 4,150