Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 96,160	$ 75,214
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,549	12,440
Stock-based compensation	6,872	5,184
Provision for credit losses	6,102	2,229
Net amortization of premiums and accretion of discounts on securities and borrowings	11,366	7,047
Amortization of other intangible assets	5,098	5,777
Losses (gains) on securities transactions, net	1	(268)
Proceeds from sales of loans held for sale	303,268	185,577
Gains on sales of loans, net	(8,919)	(4,900)
Originations of loans held for sale	(154,475)	(171,123)
Losses (gains) on sales of assets, net	453	(699)
Net change in:
Fair value of borrowings hedged by derivative transactions	0	6,779
Cash surrender value of bank owned life insurance	(4,164)	(3,781)
Accrued interest receivable	(2,916)	(1,639)
Other assets	(1,521)	(17,932)
Accrued expenses and other liabilities	(20,709)	(743)
Net cash provided by operating activities	249,165	99,162
Cash flows from investing activities:
Net loan originations and purchases	(707,654)	(459,154)
Investment securities held to maturity:
Purchases	(60,230)	(309,507)
Maturities, calls and principal repayments	157,351	134,389
Investment securities available for sale:
Purchases	(252,770)	(432,530)
Sales	0	2,081
Maturities, calls and principal repayments	87,188	760,312
Death benefit proceeds from bank owned life insurance	1,998	0
Proceeds from sales of real estate property and equipment	6,822	9,146
Purchases of real estate property and equipment	(12,976)	(15,353)
Net cash used in investing activities	(780,271)	(310,616)
Cash flows from financing activities:
Net change in deposits	(480,690)	102,507
Net change in short-term borrowings	653,484	334,853
Proceeds from issuance of long-term borrowings, net	560,000	0
Repayments of long-term borrowings	(175,000)	(269,000)
Cash dividends paid to preferred shareholders	(3,594)	(3,594)
Cash dividends paid to common shareholders	(58,000)	(55,857)
Purchase of common shares to treasury	(2,183)	(1,615)
Common stock issued, net	2,377	3,491
Net cash provided by financing activities	496,394	110,785
Net change in cash and cash equivalents	(34,712)	(100,669)
Cash and cash equivalents at beginning of year	392,501	413,800
Cash and cash equivalents at end of period	357,789	313,131
Cash payments for:
Interest on deposits and borrowings	100,380	76,693
Federal and state income taxes	7,683	12,964
Supplemental schedule of non-cash investing activities:
Transfer of loans to other real estate owned	5,865	2,899
Transfer of loans to loans held for sale	$ 225,541	$ 0