Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities
Net income	$ 201,729	$ 138,745
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	4,811	(562)
Provision for credit losses	24,518	15,907
Share-based compensation expense - equity awards	11,839	9,980
(Gain) loss on sale of OREO and long-lived assets, net of impairment	(1,270)	5,131
Securities losses, net	1,014	56
Deferred income tax expense	35,044	11,715
Originations of mortgage loans held for sale	(864,324)	(774,849)
Proceeds from sales of mortgage loans held for sale	815,728	848,116
Realized and unrealized (gain) on mortgage loans held for sale, net	(29,425)	(22,688)
Other operating activities, net	164,193	13,977
Net Cash Provided by Operating Activities	363,857	245,528
Cash Flows from Investing Activities
Proceeds from sales of available for sale securities	299,513	18,867
Proceeds from maturities, prepayments and calls of available for sale securities	316,982	311,340
Purchases of available for sale securities, net of available for sale securities acquired	(186,554)	(511,074)
Proceeds from maturities, prepayments and calls of held to maturity securities	13,123	4,746
Purchases of equity securities, net of equity securities acquired	(15,154)	(11,545)
Proceeds from sales of equity securities	3,637	70,371
Increase in loans, net of loans acquired	(824,675)	(501,618)
Proceeds from sales of premises and equipment	101	2,003
Purchases of premises and equipment, net of premises and equipment acquired	(7,819)	(8,304)
Proceeds from dispositions of OREO	8,247	11,431
Cash paid for additional investment in tax credit entities	(4,790)	(1,831)
Cash received for acquisition of a business, net of cash paid	0	99,318
Purchase of bank owned life insurance policies	0	(50,000)
Other investing activities, net	249	554
Net Cash Used in Investing Activities	(397,140)	(565,742)
Cash Flows from Financing Activities
Increase in deposits, net of deposits acquired	531,900	899,752
Net change in short-term borrowings	(485,375)	62,916
Proceeds from long-term debt, net of long-term debt acquired	400,000	440,299
Repayments of long-term debt	(191,123)	(902,262)
Cash dividends paid on common stock	(45,926)	(41,508)
Cash dividends paid on preferred stock	(4,547)	(4,547)
Net share-based compensation stock transactions	(4,448)	(2,102)
Payments to repurchase common stock	(164,724)	(30,670)
Net proceeds from issuance of preferred stock	96,388	0
Net Cash Provided by Financing Activities	132,145	421,878
Net Increase In Cash and Cash Equivalents	98,862	101,664
Cash and Cash Equivalents at Beginning of Period	690,453	625,724
Cash and Cash Equivalents at End of Period	789,315	727,388
Supplemental Schedule of Non-cash Activities
Acquisition of real estate in settlement of loans	5,055	2,722
Common stock issued in acquisitions	0	214,659
Cash paid (received) for:
Interest on deposits and borrowings, net of acquired	149,638	83,057
Income taxes, net	$ (152,950)	$ 19,006