CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 135,809	$ 118,056
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	18,408	18,593
Stock-based compensation	9,563	7,382
Provision for credit losses	7,742	8,069
Net amortization of premiums and accretion of discounts on securities and borrowings	17,476	14,152
Amortization of other intangible assets	7,596	8,452
Gains on securities transactions, net	(5)	(258)
Proceeds from sales of loans held for sale	484,102	337,069
Gains on sales of loans, net	(14,439)	(9,723)
Originations of loans held for sale	(201,393)	(342,989)
Losses (gains) on sales of assets, net	359	(1,009)
Net change in
Fair value of borrowings hedged by derivative transactions	0	6,646
Cash surrender value of bank owned life insurance	(5,705)	(5,464)
Accrued interest receivable	(5,247)	(261)
Other assets	(7,052)	(1,029)
Accrued expenses and other liabilities	(17,465)	(9,888)
Net cash provided by operating activities	429,749	147,798
Cash flows from investing activities
Net loan originations and purchases	(1,200,913)	(776,662)
Investment securities held to maturity
Purchases	(127,318)	(502,833)
Maturities, calls and principal repayments	219,967	243,764
Investment securities available for sale
Purchases	(293,788)	(557,978)
Sales	0	2,081
Maturities, calls and principal repayments	144,221	800,967
Death benefit proceeds from bank owned life insurance	10,661	2,406
Proceeds from sales of real estate property and equipment	7,717	18,243
Purchases of real estate property and equipment	(13,341)	(17,155)
Net cash used in investing activities	(1,252,794)	(787,167)
Cash flows from financing activities
Net change in deposits	(417,942)	718,632
Net change in short-term borrowings	401,749	356,365
Proceeds from issuance of long-term borrowings, net	965,000	385,000
Repayments of long-term borrowings	(185,000)	(749,000)
Proceeds from issuance of preferred stock, net	98,101	0
Cash dividends paid to preferred shareholders	(6,277)	(5,391)
Cash dividends paid to common shareholders	(84,143)	(83,821)
Purchase of common shares to treasury	(2,284)	(1,700)
Common stock issued, net	5,166	4,610
Net cash provided by financing activities	774,370	624,695
Net change in cash and cash equivalents	(48,675)	(14,674)
Cash and cash equivalents at beginning of year	392,501	413,800
Cash and cash equivalents at end of period	343,826	399,126
Cash payments for
Interest on deposits and borrowings	125,433	115,253
Federal and state income taxes	27,003	24,464
Supplemental schedule of non-cash investing activities
Transfer of loans to other real estate owned	7,147	7,611
Transfer of loans to loans held for sale	$ 225,541	$ 174,501