Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net income	$ 138,745	$ 102,491
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion, including amortization of purchase accounting adjustments and market value adjustments	(562)	1,825
Provision for loan and lease losses	15,581	18,204
Share-based compensation cost - equity awards	9,980	7,111
(Gain)/loss on sale of OREO and long-lived assets, net of impairment	5,131	(2,950)
Loss/(gain) on sale of available for sale securities	56	(59)
Expense/(benefit) for deferred income taxes	11,715	10,040
Originations of mortgage loans held for sale	(774,849)	(919,207)
Proceeds from sales of mortgage loans held for sale	848,116	965,042
Realized and unrealized (gain)/loss on mortgage loans held for sale, net	(22,688)	(33,110)
Other operating activities, net	14,303	(2,355)
Net Cash Provided by Operating Activities	245,528	147,032
Cash Flows from Investing Activities
Proceeds from sales of available for sale securities	18,867	64,144
Proceeds from maturities, prepayments and calls of available for sale securities	311,340	236,468
Purchases of available for sale securities, net of available for sale securities acquired	(511,074)	(856,187)
Proceeds from maturities, prepayments and calls of held to maturity securities	4,746	4,267
Purchases of equity securities, net of equity securities acquired	(11,545)	(1,180)
Proceeds from sales of equity securities	70,371	5,059
Increase in loans, net of loans acquired	(501,618)	(481,482)
Proceeds from sales of premises and equipment	2,003	2,365
Purchases of premises and equipment, net of premises and equipment acquired	(8,304)	(24,001)
Proceeds from dispositions of OREO	11,431	9,949
Cash paid for additional investment in tax credit entities	(1,831)	(2,827)
Cash received for acquisition of a business, net of cash paid	99,318	0
Purchase of bank owned life insurance policies	(50,000)	0
Other investing activities, net	554	1,267
Net Cash Used in Investing Activities	(565,742)	(1,042,158)
Cash Flows from Financing Activities
Increase/(decrease) in deposits, net of deposits acquired	899,752	(554,983)
Net change in short-term borrowings	62,916	74,799
Proceeds from long-term debt, net of long-term debt acquired	440,299	50,000
Repayments of long-term debt	(902,262)	(11,252)
Cash dividends paid on common stock	(41,508)	(34,476)
Cash dividends paid on preferred stock	(4,547)	(4,548)
Net share-based compensation stock transactions	(2,102)	(2,374)
Payments to repurchase common stock	(30,670)	0
Net proceeds from issuance of common stock	0	485,194
Net Cash Provided by Financing Activities	421,878	2,360
Net Increase (Decrease) In Cash and Cash Equivalents	101,664	(892,766)
Cash and Cash Equivalents at Beginning of Period	625,724	1,362,126
Cash and Cash Equivalents at End of Period	727,388	469,360
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	2,722	6,467
Common stock issued in acquisitions	214,659	0
Cash paid for:
Interest on deposits and borrowings	83,057	40,778
Income taxes, net	$ 19,006	$ 40,872