Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 171,968	$ 97,385
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	57,388	36,392
Provision for credit losses	30,049	27,606
Deferred tax expense	15,541	21,226
Net securities gains	(31)	(3,118)
Tax benefit of stock-based compensation	(357)	(724)
Loans originated for sale	(529,376)	(519,973)
Loans sold	589,823	380,522
Gain on sale of loans	(11,668)	(4,716)
Net change in:
Interest receivable	1,044	(462)
Interest payable	2,658	58
Bank owned life insurance	(5,367)	(5,063)
Other, net	27,613	(114,988)
Net cash flows provided by (used in) operating activities	349,285	(85,855)
Investing Activities
Net change in loans and leases	(719,659)	(582,236)
Securities available for sale:
Purchases	(581,769)	(592,601)
Sales	0	755,866
Maturities	288,337	247,930
Debt securities held to maturity:
Purchases	(224,229)	(782,281)
Sales	0	1,574
Maturities	168,333	214,739
Increase in premises and equipment	(10,333)	(34,832)
Net cash received in business combinations	0	196,964
Other, net	(32)	(5,805)
Net cash flows used in investing activities	(1,079,352)	(580,682)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	(110,447)	(45,049)
Time deposits	252,901	(143,154)
Short-term borrowings	655,809	1,126,769
Proceeds from issuance of long-term borrowings	17,490	77,223
Repayment of long-term borrowings	(56,343)	(133,162)
Net proceeds from issuance of common stock	7,213	3,702
Cash dividends paid:
Preferred stock	(4,020)	(4,020)
Common stock	(78,280)	(64,561)
Net cash flows provided by financing activities	684,323	817,748
Net Increase (Decrease) in Cash and Cash Equivalents	(45,744)	151,211
Cash and cash equivalents at beginning of period	479,443	371,407
Cash and Cash Equivalents at End of Period	$ 433,699	$ 522,618