Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 118,056	$ 98,286
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,593	15,213
Stock-based compensation	7,382	6,512
Provision for credit losses	8,069	4,594
Net amortization of premiums and accretion of discounts on securities and borrowings	14,152	17,595
Amortization of other intangible assets	8,452	6,721
Gains on securities transactions, net	(258)	(2,481)
Proceeds from sales of loans held for sale	337,069	94,342
Gains on sales of loans, net	(9,723)	(3,034)
Originations of loans held for sale	(342,989)	(86,274)
(Gains) losses on sales of assets, net	(1,009)	77
FDIC loss-share receivable (excluding reimbursements)	872	3,380
Net change in:
Trading securities	0	14,233
Fair value of borrowings hedged by derivative transactions	6,646	3,270
Cash surrender value of bank owned life insurance	(5,464)	(5,188)
Accrued interest receivable	(261)	(199)
Other assets	(2,170)	(33,555)
Accrued expenses and other liabilities	(9,888)	12,490
Net cash provided by operating activities	147,529	145,982
Cash flows from investing activities:
Net loan originations	(182,893)	(486,862)
Loans purchased	(593,769)	(1,066,934)
Investment securities held to maturity:
Purchases	(502,833)	(201,681)
Sales	0	11,666
Maturities, calls and principal repayments	243,764	321,771
Investment securities available for sale:
Purchases	(557,978)	(38,819)
Sales	2,081	14,022
Maturities, calls and principal repayments	800,967	115,397
Death benefit proceeds from bank owned life insurance	2,406	0
Proceeds from sales of real estate property and equipment	18,243	10,510
Purchases of real estate property and equipment	(17,155)	(23,139)
Reimbursements from the FDIC	269	2,835
Net cash used in investing activities	(786,898)	(1,341,234)
Cash flows from financing activities:
Net change in deposits	718,632	465,747
Net change in short-term borrowings	356,365	156,160
Proceeds from issuance of long-term borrowings, net	385,000	98,930
Repayments of long-term borrowings	(749,000)	(100,000)
Proceeds from issuance of preferred stock, net	0	111,590
Cash dividends paid to preferred shareholders	(5,391)	(2,017)
Cash dividends paid to common shareholders	(83,821)	(76,671)
Purchase of common shares to treasury	(1,700)	(2,108)
Common stock issued, net	4,610	4,993
Net cash provided by financing activities	624,695	656,624
Net change in cash and cash equivalents	(14,674)	(538,628)
Cash and cash equivalents at beginning of year	413,800	830,407
Cash and cash equivalents at end of period	399,126	291,779
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	115,253	121,907
Federal and state income taxes	24,464	49,932
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	7,611	8,711
Transfer of loans to loans held for sale	$ 174,501	$ 0