Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 160,183	$ 97,465
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,942	21,350
Provision for loan losses	43,982	96,204
Gain on other real estate owned	(1,865)	(5,145)
Deferred tax expense (benefit)	8,072	(14,713)
Increase in cash surrender value of life insurance contracts	(10,855)	(8,807)
(Gain) loss on disposal of other assets	1,662	(6,014)
Net (increase) decrease in loans held for sale	11,583	(21,698)
Net amortization of securities premium/discount	24,119	20,836
Amortization of intangible assets	16,532	15,015
Amortization of FDIC indemnification asset	2,427	4,678
Stock-based compensation expense	12,370	10,555
Increase (decrease) in interest payable and other liabilities	(5,038)	8,946
Net cash receipts from (payments to) FDIC for loss share claims	2,300	(436)
Decrease in FDIC loss share receivable	8,613	3,487
Increase in payable to FDIC for loan servicing	180,882
Decrease in other assets	11,446	40,693
Other, net	17,723	6,572
Net cash provided by operating activities	505,078	268,988
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	213,877	141,716
Proceeds from maturities of securities available for sale	249,270	298,810
Purchases of securities available for sale	(578,690)	(720,241)
Proceeds from maturities of securities held to maturity	276,073	307,633
Purchases of securities held to maturity	(554,442)	(371,657)
Net decrease in short-term investments	331,746	436,635
Proceeds from sales of loans		166,922
Net increase in loans	(725,228)	(591,696)
Purchase of life insurance contracts	(50,000)	(40,000)
Purchases of property and equipment	(16,086)	(10,817)
Proceeds from sales of property and equipment	389	677
Proceeds from sales of other real estate	15,357	20,709
Net of cash paid for FNBC I acquisition	(322,708)
Net cash received for FNBC II acquisition	799,509
Other, net	(28,976)	(3,651)
Net cash used in investing activities	(389,909)	(364,960)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	181,084	536,581
Net decrease in short-term borrowings	(84,890)	(347,688)
Repayments of long-term debt	(198,690)	(16,796)
Net proceeds from issuance of long-term debt	124	6,796
Dividends paid	(62,400)	(57,349)
Taxes paid related to nets share settlement of equity awards	(3,235)	(444)
Proceeds from exercise of stock options	11,610	49
Proceeds from dividend reinvestment and stock purchase plan	2,314	821
Net cash provided by (used in) financing activities	(154,083)	121,970
NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS	(38,914)	25,998
CASH AND DUE FROM BANKS, BEGINNING	372,689	303,874
CASH AND DUE FROM BANKS, ENDING	333,775	329,872
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 4,770	$ 12,012