Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 75,214	$ 62,332
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,440	10,230
Stock-based compensation	5,184	3,886
Provision for credit losses	2,229	4,500
Net amortization of premiums and accretion of discounts on securities and borrowings	7,047	12,519
Amortization of other intangible assets	5,777	4,489
Gains on securities transactions, net	(268)	(2,324)
Proceeds from sales of loans held for sale	185,577	53,005
Gains on sales of loans, net	(4,900)	(1,020)
Originations of loans held for sale	(171,123)	(32,793)
Gains on sales of assets, net	(699)	(481)
FDIC loss-share receivable (excluding reimbursements)	559	3,325
Net change in:
Trading securities	0	14,233
Fair value of borrowings hedged by derivative transactions	6,779	(1,059)
Cash surrender value of bank owned life insurance	(3,781)	(3,382)
Accrued interest receivable	(1,639)	(945)
Other assets	(18,585)	(25,207)
Accrued expenses and other liabilities	(743)	(1,696)
Net cash provided by operating activities	99,068	99,612
Cash flows from investing activities:
Net loan originations	(15,384)	(385,576)
Loans purchased	(443,770)	(629,074)
Investment securities held to maturity:
Purchases	(309,507)	(168,682)
Sales	0	11,666
Maturities, calls and principal repayments	134,389	209,017
Investment securities available for sale:
Purchases	(432,530)	(26,791)
Sales	2,081	14,022
Maturities, calls and principal repayments	760,312	80,994
Proceeds from sales of real estate property and equipment	9,146	7,626
Purchases of real estate property and equipment	(15,353)	(9,106)
Reimbursements from the FDIC	94	1,753
Net cash used in investing activities	(310,522)	(894,151)
Cash flows from financing activities:
Net change in deposits	102,507	296,915
Net change in short-term borrowings	334,853	(20,633)
Proceeds from issuance of long-term borrowings, net	0	98,851
Repayments of long-term borrowings	(269,000)	0
Proceeds from issuance of preferred stock, net	0	111,590
Cash dividends paid to preferred shareholders	(3,594)	0
Cash dividends paid to common shareholders	(55,857)	(51,012)
Purchase of common shares to treasury	(1,615)	(2,082)
Common stock issued, net	3,491	3,708
Net cash provided by financing activities	110,785	437,337
Net change in cash and cash equivalents	(100,669)	(357,202)
Cash and cash equivalents at beginning of year	413,800	830,407
Cash and cash equivalents at end of period	313,131	473,205
Supplemental disclosures of cash flow information:
Interest on deposits and borrowings	76,693	78,777
Federal and state income taxes	12,964	38,525
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	$ 2,899	$ 4,369