Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 66,004	$ 60,206
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	4,117	1,539
Depreciation and amortization	7,517	6,331
Net amortization of securities premiums and discounts	(3,650)	(77)
Realized securities gains	(821)	(101)
Gain on sales of loans	(1,566)	(1,453)
Cash receipts from the sale of loans originated for sale	98,587	95,713
Cash disbursements for loans originated for sale	(99,782)	(97,676)
Deferred income tax benefit	(893)	(604)
Gain on other assets	(455)	(156)
Increase in interest receivable	(2,064)	(2,618)
Increase in interest payable	461	575
Amortization of stock-based compensation arrangements	541	628
Excess tax benefit from stock-based compensation arrangements	(263)	(898)
Other, net	4,374	(2,847)
Net cash provided by operating activities	72,107	58,562
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid		6,248
Net decrease in federal funds sold		750
Purchases of held for investment securities	(1,010)	(225)
Purchases of available for sale securities		(60,604)
Proceeds from maturities, calls and paydowns of held for investment securities	440	509
Proceeds from maturities, calls and paydowns of available for sale securities	358,972	59,235
Proceeds from sales of available for sale securities		1,467
Purchase of equity securities	(2,649)	(1,709)
Proceeds from paydowns and sales of equity securities	1,892	1,080
Net change in loans	(121,426)	24,177
Purchases of premises, equipment and computer software	(12,907)	(16,631)
Other, net	(3,893)	400
Net cash provided by investing activities	219,419	14,697
FINANCING ACTIVITIES
Net change in deposits	8,118	(52,831)
Net (decrease)/increase in short-term borrowings	(675)	1,600
Issuance of common stock in connection with stock options, net	781	1,723
Cash dividends paid	(19,567)	(13,566)
Net cash used in financing activities	(11,343)	(63,074)
Net increase in cash, due from banks and interest-bearing deposits	280,183	10,185
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,424,255	1,757,875
Cash, due from banks and interest-bearing deposits at the end of the period	1,704,438	1,768,060
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	27,882	17,525
Cash paid during the period for income taxes	17,175	16,150
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	$ 9,788	$ 6,870