Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 45,232	$ 34,072
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	1,913	6,907
Depreciation and amortization	5,906	6,258
Net amortization of securities premiums and discounts	(103)	184
Realized securities losses/(gains)	330	(35)
Gain on sales of loans	(1,448)	(1,257)
Cash receipts from the sale of loans originated for sale	97,146	86,121
Cash disbursements for loans originated for sale	(95,477)	(81,566)
Deferred income tax benefit	(723)	(1,917)
Loss/(gain) on other assets	62	(1,316)
Increase in interest receivable	(1,107)	(1,040)
Increase in interest payable	126	14
Amortization of stock-based compensation arrangements	465	901
Excess tax benefit from stock-based compensation arrangements	(1,784)
Other, net	3,234	(4,867)
Net cash provided by operating activities	53,772	42,459
INVESTING ACTIVITIES
Net decrease in federal funds sold	700
Purchases of held for investment securities	(220)	(215)
Purchases of available for sale securities	(42,006)	(8,553)
Proceeds from maturities, calls and paydowns of held for investment securities	644	690
Proceeds from maturities, calls and paydowns of available for sale securities	60,360	102,677
Proceeds from sales of available for sale securities		300
Net change in loans	(181,851)	(98,555)
Purchases of premises, equipment and computer software	(6,568)	(5,048)
Proceeds from the sale of other real estate owned and other assets	2,088	7,020
Net cash used in investing activities	(166,853)	(1,684)
FINANCING ACTIVITIES
Net change in deposits	(12,375)	(29,376)
Net increase in short-term borrowings	500	3,000
Issuance of common stock, net	3,441	1,973
Common stock acquired		(5,523)
Cash dividends paid	(12,046)	(11,204)
Net cash used in financing activities	(20,480)	(41,130)
Net decrease in cash, due from banks and interest-bearing deposits	(133,561)	(355)
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,850,461	1,598,177
Cash, due from banks and interest-bearing deposits at the end of the period	1,716,900	1,597,822
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	8,963	7,207
Cash paid during the period for income taxes	20,450	17,900
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 6,045	$ 5,590