Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 272,731	$ 175,078
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	82,074	60,349
Provision for credit losses	46,024	44,374
Deferred tax expense	28,867	36,706
Net securities gains	(31)	(5,895)
Tax benefit of stock-based compensation	(378)	(735)
Loans originated for sale	(864,757)	(787,957)
Loans sold	933,183	709,323
Gain on sale of loans	(17,618)	(10,583)
Net change in:
Interest receivable	(8,259)	(10,104)
Interest payable	6,679	938
Bank owned life insurance	(7,204)	(8,100)
Other, net	45,530	(78,095)
Net cash flows provided by operating activities	516,841	125,299
Investing Activities
Net change in loans and leases	(1,054,971)	(886,944)
Securities available for sale:
Purchases	(1,029,263)	(1,042,784)
Sales	0	786,762
Maturities	421,666	404,618
Debt securities held to maturity:
Purchases	(244,367)	(842,020)
Sales	0	57,050
Maturities	275,788	309,075
Purchase of bank owned life insurance	39	25,102
Increase in premises and equipment	(19,267)	(46,781)
Net cash received in business combinations and divestitures	141,082	196,964
Other, net	70	0
Net cash flows used in investing activities	(1,509,301)	(1,089,162)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	272,989	384,103
Time deposits	830,662	306,745
Short-term borrowings	1,043	573,102
Proceeds from issuance of long-term borrowings	26,612	96,917
Repayment of long-term borrowings	(67,163)	(150,420)
Net proceeds from issuance of common stock	10,251	6,963
Cash dividends paid:
Preferred stock	(6,030)	(6,030)
Common stock	(117,494)	(103,584)
Net cash flows provided by financing activities	950,870	1,107,796
Net Increase (Decrease) in Cash and Cash Equivalents	(41,590)	143,933
Cash and cash equivalents at beginning of period	479,443	371,407
Cash and Cash Equivalents at End of Period	$ 437,853	$ 515,340