Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities:
Net Income	$ 54,789	$ 47,467
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	2,963	6,931
Depreciation and amortization	3,275	3,100
Gains on sale of loans	(4,567)	(5,455)
Securities premium amortization (discount accretion), net	1,943	2,335
Origination of loans held for sale	(351,318)	(343,959)
Proceeds from sale of loans held for sale	358,187	337,583
Net increase in cash surrender value of Bank Owned Life Insurance	(739)	(780)
Decrease (increase) deferred income tax benefit	1,926	(1,010)
Decrease in value of other real estate owned		200
Net loss (gain) on sale of other real estate owned	361	(563)
Net gain on sale of investment securities	(531)	(1,122)
Stock-based compensation expense	3,169	3,312
Net tax benefits from stock compensation	460
Excess tax benefits realized from stock compensation		(140)
Increase in other assets	(9,386)	(5,542)
(Decrease) increase in other liabilities	(8,170)	3,959
Net cash provided by operating activities	52,362	46,316
Cash Flows From Investing Activities:
Decrease in interest bearing deposits with other banks and short-term investments		764
Purchases of available for sale investment securities	(55,206)	(57,550)
Proceeds from maturities of available for sale securities	37,466	45,462
Proceeds from sale/call of available for sale securities	58,024	87,717
Purchases of Federal Reserve and Federal Home Loan Bank stock	(19,125)	(2,961)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	12,122
Net increase in loans	(308,097)	(408,686)
Proceeds from sale of other real estate owned	939	3,062
Bank premises and equipment acquired	(1,871)	(2,448)
Net cash used in investing activities	(275,748)	(334,640)
Cash Flows From Financing Activities:
Increase in deposits	151,583	177,544
Increase in customer repurchase agreements	5,486	8,152
Increase in short-term borrowings	145,000	50,000
Increase in long-term borrowings	196
Proceeds from exercise of equity compensation plans	257	252
Excess tax benefits realized from stock compensation		140
Proceeds from employee stock purchase plan	402	371
Net cash provided by financing activities	302,924	236,459
Net Increase (Decrease) In Cash and Cash Equivalents	79,538	(51,865)
Cash and Cash Equivalents at Beginning of Period	368,163	298,363
Cash and Cash Equivalents at End of Period	447,701	246,498
Supplemental Cash Flows Information:
Interest paid	18,648	10,981
Income taxes paid	$ 34,300	$ 33,650