Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 52,054	$ 50,442
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	9,847	4,029
Depreciation and amortization	9,374	8,734
Net amortization of securities premiums and discounts	161	747
Realized securities losses (gains)	111	(7,121)
Gain on sales of loans	(2,120)	(1,534)
Cash receipts from the sale of loans originated for sale	143,044	132,957
Cash disbursements for loans originated for sale	(136,903)	(134,396)
Deferred income tax benefit	(3,069)	(1,029)
Gain on other assets	(1,294)	(76)
Increase in interest receivable	73	8
Decrease in interest payable	(22)	(64)
Amortization of stock-based compensation arrangements	1,266	1,243
Other, net	(1,684)	4,797
Net cash provided by operating activities	70,838	58,737
INVESTING ACTIVITIES
Net increase in federal funds sold	(500)
Purchases of held for investment securities	(806)	(1,085)
Purchases of available for sale securities	(78,592)	(41,424)
Proceeds from maturities, calls and paydowns of held for investment securities	5,039	1,344
Proceeds from maturities, calls and paydowns of available for sale securities	153,620	53,285
Proceeds from sales of available for sale securities	426	8,576
Net change in loans	(82,782)	(113,740)
Purchases of premises, equipment and computer software	(7,845)	(9,535)
Proceeds from the sale of other assets	8,740	4,324
Net cash used in investing activities	(2,700)	(98,255)
FINANCING ACTIVITIES
Net change in deposits	51,591	(206,113)
Net increase/(decrease) in short-term borrowings	3,500	(205)
Issuance of common stock, net	7,079	2,838
Common stock acquired	(5,523)
Cash dividends paid	(16,806)	(15,836)
Net cash provided by (used in) financing activities	39,841	(219,316)
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	107,979	(258,834)
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,598,177	1,913,895
Cash, due from banks and interest-bearing deposits at the end of the period	1,706,156	1,655,061
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	10,919	9,142
Cash paid during the period for income taxes	26,200	26,531
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 5,922	$ 5,609