Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,050	$ 16,579
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	72	4,103
Depreciation and amortization	2,967	3,111
Net amortization of securities premiums and discounts	(47)	148
Realized securities gains		(100)
Gain on sales of loans	(632)	(562)
Cash receipts from the sale of loans originated for sale	43,005	40,271
Cash disbursements for loans originated for sale	(40,826)	(33,610)
Deferred income tax benefit	(485)	(829)
Loss/(gain) on other assets	35	(1,222)
Decrease/(increase) in interest receivable	598	(176)
Increase in interest payable	22	13
Amortization of stock-based compensation arrangements	222	451
Excess tax benefit from stock-based compensation arrangements	(376)
Other, net	5,310	300
Net cash provided by operating activities	31,915	28,477
INVESTING ACTIVITIES
Net decrease in federal funds sold	500
Purchases of available for sale securities	(20,511)
Proceeds from maturities, calls and paydowns of held for investment securities	361	410
Proceeds from maturities, calls and paydowns of available for sale securities	26,489	55,071
Proceeds from sales of available for sale securities		299
Net change in loans	7,366	(45,010)
Purchases of premises, equipment and computer software	(3,369)	(2,939)
Proceeds from the sale of other real estate owned and other assets	1,186	5,971
Net cash provided by investing activities	12,022	13,802
FINANCING ACTIVITIES
Net change in deposits	146,570	37,514
Net increase in short-term borrowings	300	800
Issuance of common stock, net	2,752	693
Common stock acquired		(5,523)
Cash dividends paid	(6,008)	(5,615)
Net cash provided by financing activities	143,614	27,869
Net increase in cash, due from banks and interest-bearing deposits	187,551	70,148
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	2,038,012	1,668,325
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	4,235	3,591
Cash paid during the period for income taxes	1,100	1,050
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 6,028	$ 5,579