Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 101,281	$ 50,746
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,960	14,344
Provision for loan losses	30,942	77,232
(Gain) loss on other real estate owned	(2,408)	127
Deferred tax expense (benefit)	5,415	(10,663)
Increase in cash surrender value of life insurance contracts	(7,430)	(5,384)
Loss (gain) on disposal of other assets	1,455	(4,690)
Net decrease (increase) in loans held for sale	8,177	(21,170)
Net amortization of securities premium/discount	14,944	12,905
Amortization of intangible assets	10,462	10,129
Amortization of FDIC indemnification asset	2,427	3,139
Stock-based compensation expense	8,360	7,164
Decrease in interest payable and other liabilities	(24,405)	(2,683)
Net payments to FDIC for loss share claims	(935)	(159)
Decrease in FDIC loss share receivable	8,613	7,426
Decrease in other assets	8,259	37,117
Other, net	3,595	2,525
Net cash provided by operating activities	182,712	178,105
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available for sale	213,877	102,335
Proceeds from maturities of securities available for sale	157,290	186,790
Purchases of securities available for sale	(425,096)	(461,139)
Proceeds from maturities of securities held to maturity	174,662	190,721
Purchases of securities held to maturity	(554,442)	(282,190)
Net decrease in short-term investments	317,042	412,396
Proceeds from sales of loans		106,660
Net increase in loans	(385,823)	(470,732)
Purchase of life insurance contracts	(50,000)	(40,000)
Purchases of property and equipment	(12,649)	(3,950)
Proceeds from sales of property and equipment	16	671
Proceeds from sales of other real estate	12,311	8,995
Net of cash paid for FNBC I acquisition	(322,708)
Net cash received for FNBC II acquisition	798,367
Other, net	(38,414)	2,989
Net cash used in investing activities	(115,567)	(246,454)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	90,040	467,973
Net decrease in short-term borrowings	(11,134)	(328,537)
Repayments of long-term debt	(121,837)	(28,836)
Net proceeds from issuance of long-term debt	83	5,885
Dividends paid	(41,594)	(38,238)
Cash paid for taxes with forfeited shares of stock	(3,124)	(380)
Proceeds from exercise of stock options	11,427	36
Proceeds from dividend reinvestment and stock purchase plan	1,530
Net cash (used in) provided by financing activities	(74,609)	77,903
NET (DECREASE) INCREASE IN CASH AND DUE FROM BANKS	(7,464)	9,554
CASH AND DUE FROM BANKS, BEGINNING	372,689	303,874
CASH AND DUE FROM BANKS, ENDING	365,225	313,428
SUPPLEMENTAL INFORMATION FOR NON-CASH INVESTING AND FINANCING ACTIVITIES
Assets acquired in settlement of loans	$ 2,855	$ 10,526