Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 60,206	$ 45,232
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	1,539	1,913
Depreciation and amortization	6,331	5,906
Net amortization of securities premiums and discounts	(77)	(103)
Realized securities (gains)/losses	(101)	330
Gain on sales of loans	(1,453)	(1,448)
Cash receipts from the sale of loans originated for sale	95,713	97,146
Cash disbursements for loans originated for sale	(97,676)	(95,477)
Deferred income tax benefit	(604)	(723)
(Gain)/loss on other assets	(156)	62
Increase in interest receivable	(2,618)	(1,107)
Increase in interest payable	575	126
Amortization of stock-based compensation arrangements	628	465
Excess tax benefit from stock-based compensation arrangements	(898)	(1,784)
Other, net	(5,678)	3,234
Net cash provided by operating activities	55,731	53,772
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	6,248
Net decrease in federal funds sold	750	700
Purchases of held for investment securities	(225)	(220)
Purchases of available for sale securities	(60,604)	(42,006)
Proceeds from maturities, calls and paydowns of held for investment securities	509	644
Proceeds from maturities, calls and paydowns of available for sale securities	59,235	60,360
Proceeds from sales of available for sale securities	1,467
Purchase of equity securities	(1,709)
Proceeds from paydowns and sales of equity securities	1,080
Net change in loans	24,177	(181,851)
Purchases of premises, equipment and computer software	(16,631)	(6,568)
Proceeds from the sale of other real estate owned and other assets	3,231	2,088
Net cash provided by/(used in) investing activities	17,528	(166,853)
FINANCING ACTIVITIES
Net change in deposits	(52,831)	(12,375)
Net increase in short-term borrowings	1,600	500
Issuance of common stock in connection with stock options, net	1,723	3,441
Cash dividends paid	(13,566)	(12,046)
Net cash used in financing activities	(63,074)	(20,480)
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	10,185	(133,561)
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,757,875	1,850,461
Cash, due from banks and interest-bearing deposits at the end of the period	1,768,060	1,716,900
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	17,525	8,963
Cash paid during the period for income taxes	16,150	20,450
Noncash investing and financing activities:
Stock issued in acquisitions	39,498
Cash consideration for acquisitions	24,722
Fair value of assets acquired in acquisitions	377,320
Liabilities assumed in acquisitions	338,860
Unpaid common stock dividends declared	$ 6,870	$ 6,045