Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 29,620	$ 22,050
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	314	72
Depreciation and amortization	3,143	2,967
Net amortization of securities premiums and discounts	(49)	(47)
Realized securities losses	14
Gain on sales of loans	(651)	(632)
Cash receipts from the sale of loans originated for sale	44,558	43,005
Cash disbursements for loans originated for sale	(43,949)	(40,826)
Deferred income tax benefit	(117)	(485)
(Gain)/loss on other assets	(21)	35
(Increase)/decrease in interest receivable	(1,111)	598
Increase in interest payable	353	22
Amortization of stock-based compensation arrangements	306	222
Excess tax benefit from stock-based compensation arrangements	(647)	(376)
Other, net	(8,067)	5,310
Net cash provided by operating activities	23,696	31,915
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	6,248
Net decrease in federal funds sold	2,451	500
Purchases of available for sale securities	(30,861)	(20,511)
Proceeds from maturities, calls and paydowns of held for investment securities	213	361
Proceeds from maturities, calls and paydowns of available for sale securities	5,729	26,489
Proceeds from sales of available for sale securities	1,460
Net change in loans	48,819	7,366
Purchases of premises, equipment and computer software	(7,168)	(3,369)
Proceeds from the sale of other real estate owned and other assets	1,802	1,186
Net cash provided by investing activities	28,693	12,022
FINANCING ACTIVITIES
Net change in deposits	(31,953)	146,570
Net (decrease)/increase in short-term borrowings	(800)	300
Issuance of common stock in connection with stock options, net	1,290	2,752
Cash dividends paid	(6,698)	(6,008)
Net cash (used in) provided by financing activities	(38,161)	143,614
Net increase in cash, due from banks and interest-bearing deposits	14,228	187,551
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	1,772,103	2,038,012
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	7,486	4,235
Cash paid during the period for income taxes	1,250	1,100
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	$ 6,854	$ 6,028