CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flow From Operating Activities:
Net income	$ 81,051	$ 65,384	$ 60,162
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	5,657	417	2,560
Depreciation and amortization	7,161	6,262	6,007
Change in deferred taxes	8,611	4,444	15,048
Share-based compensation	2,600	2,270	2,177
Tax benefit from stock options exercised	(107)	(70)	(60)
Loans originated for sale	(354,265)	(364,411)	(222,892)
Proceeds from sales of Loans	367,148	367,377	225,158
Gains on sales of loans held for sale	(5,918)	(5,625)	(4,170)
Gain on the sale of insurance subsidiary		8,265
Gain on cancellation of subordinated debentures		(1,250)
Gains on sales of securities available for sale	(3,389)	(2,670)	(3,581)
Change in interest receivable	(1,779)	(2,833)	(545)
Change in interest payable	18	(162)	1,332
Other adjustments	72	(4,208)	(5,356)
Net cash provided by operating activities	106,860	56,660	75,840
Cash Flows from Investing Activities:
Net change in interest-bearing deposits	7,856	24,917	24,075
Purchases of:
Securities available for sale	(281,470)	(200,154)	(110,936)
Securities held to maturity	(110,797)	(87,282)	(142,988)
Proceeds from sales of securities available for sale	167,186	83,647	126,575
Proceeds from maturities of:
Securities available for sale	73,956	63,124	68,339
Securities held to maturity	119,052	98,581	69,420
Redemption (Purchase) of Federal Reserve and Federal Home Loan Bank stock	19,669	7,268	(413)
Net change in loans	(452,781)	(350,287)	(170,109)
Net cash and cash equivalents received (paid) in acquisition		(7,936)	(10,084)
Net cash received from sale of insurance subsidiary		15,155
Proceeds from the sale of other real estate owned	9,974	12,567	14,241
Other investing activities	(4,490)	9	5,889
Net cash used in investing activities	(451,845)	(340,391)	(125,991)
Net change in :
Demand and savings deposits	332,600	240,736	53,062
Certificates of deposit and other time deposits	(66,920)	(79,656)	127,740
Borrowings	1,107,795	491,660	678,290
Repayment of borrowings	(982,449)	(370,813)	(789,563)
Cash dividends on common stock	(22,203)	(15,654)	(10,694)
Stock issued under employee benefit plans	462	460	478
Stock issued under dividend reinvestment and stock purchase plans	835	661	523
Stock options exercised	2,495	1,461	504
Tax benefit from stock options exercised	107	70	60
Stock redeemed	(1,980)	(1,640)	(1,067)
Net cash provided by financing activities	370,742	267,285	59,333
Net Change in Cash and Cash Equivalents	25,757	(16,446)	9,182
Cash and Cash Equivalents, beginning of the year	102,170	118,616	109,434
Cash and Cash Equivalents, end of year	127,927	102,170	118,616
Additional cash flow information:
Interest paid	26,821	24,903	20,412
Income tax paid	11,999	21,200	6,209
Loans transferred to other real estate owned	1,684	3,644	4,431
Fixed assets transferred to other real estate owned	360	1,600	297
Non-cash investing activities using trade date accounting	14,179	1,559	3,170
Liabilities assumed in conjunction with acquisitions
Fair value of assets acquired	0	635,047	280,725
Cash received (paid) in acquisition		(14,500)	(14,208)
Less: Common stock issued		70,402	34,981
Liabilities assumed	$ 0	$ 550,145	$ 231,536