Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income	$ 132,135	$ 141,647
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	13,489	3,414
Amortization of purchase accounting and market value adjustments	(32,766)	(13,803)
Provision for loan losses	36,718	39,255
Share-based compensation cost - equity awards	11,499	11,229
(Gain)/loss on sale of assets, net	(23)	(64)
(Gain)/loss on sale of available for sale securities	183	(1,997)
(Gain)/loss on sale of OREO, net	(3,309)	(5,798)
Amortization of premium/discount on securities, net	20,337	16,288
Loss on abandonment of fixed assets	4,007	0
Derivative (gains) on swaps	(383)	0
Expense for deferred income taxes	12,438	3,008
Originations of mortgage loans held for sale	(1,415,447)	(1,922,021)
Proceeds from sales of mortgage loans held for sale	1,475,038	1,940,605
Realized and unrealized (gain)/loss on mortgage loans held for sale, net	(48,944)	(77,271)
Other operating activities, net	14,445	41,427
Net Cash Provided by Operating Activities	219,417	175,919
Cash Flows from Investing Activities
Proceeds from sales of available for sale securities	577,891	197,733
Proceeds from maturities, prepayments and calls of available for sale securities	410,419	349,361
Purchases of available for sale securities, net of available for sale securities acquired	(1,312,762)	(594,143)
Proceeds from maturities, prepayments and calls of held to maturity securities	6,714	7,597
Purchases of held to maturity securities	(94,179)	0
Purchases of equity securities, net of equity securities acquired	(40,749)	(31,380)
Proceeds from sales of equity securities	6,119	0
Reimbursement of recoverable covered asset losses to the FDIC	(127)	(7,173)
Increase in loans, net of loans acquired	(699,684)	(568,844)
Proceeds from sales of premises and equipment	2,750	1,200
Purchases of premises and equipment, net of premises and equipment acquired	(31,522)	(9,436)
Proceeds from dispositions of OREO	11,653	28,089
Cash paid for investments in tax credit entities	(7,160)	(16,817)
Payments to Acquire Businesses, Net of Cash Acquired	(490,509)	0
Other investing activities, net	1,020	(490)
Net Cash Used in Investing Activities	(1,660,126)	(644,303)
Cash Flows from Financing Activities
Increase/(decrease) in deposits, net of deposits acquired	(456,350)	344,130
Net change in short-term borrowings, net of borrowings acquired	494,029	386,655
Proceeds from long-term debt	516,620	346,754
Repayments of long-term debt	(17,342)	(13,826)
Cash dividends paid on common stock	(52,841)	(42,003)
Cash dividends paid on preferred stock	(8,146)	(6,077)
Net share-based compensation stock transactions	(1,922)	118
Payments to repurchase common stock	0	(11,666)
Net proceeds from issuance of common stock	485,751	0
Net proceeds from issuance of preferred stock	0	55,285
Net Cash Provided by Financing Activities	959,799	1,059,370
Net Increase (Decrease) In Cash and Cash Equivalents	(480,910)	590,986
Cash and Cash Equivalents at Beginning of Period	1,362,126	510,267
Cash and Cash Equivalents at End of Period	881,216	1,101,253
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	6,873	5,813
Common stock issued in acquisitions	211,043	0
Cash paid for:
Interest on deposits and borrowings	69,057	46,656
Income taxes, net	$ 67,434	$ 54,560