Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities:
Net Income	$ 35,715	$ 27,017
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	1,969	1,397
Depreciation and amortization	1,811	1,772
Gains on sale of loans	(1,523)	(2,048)
Securities premium amortization (discount accretion), net	1,087	1,006
Origination of loans held for sale	(102,316)	(153,995)
Proceeds from sale of loans held for sale	103,062	178,105
Net increase in cash surrender value of BOLI	(344)	(367)
(Increase) decrease deferred income tax benefit	(1,433)	17
Net loss (gain) on sale of other real estate owned		361
Net gain on sale of investment securities	(42)	(505)
Stock-based compensation expense	1,476	1,856
Net tax benefits from stock compensation	108	589
Increase in other assets	(25,519)	(594)
(Decrease) increase in other liabilities	(5,430)	7,478
Net cash provided by operating activities	8,621	62,089
Cash Flows From Investing Activities:
Purchases of available for sale investment securities	(32,269)	(35,183)
Proceeds from maturities of available for sale securities	21,249	22,922
Proceeds from sale/call of available for sale securities	17,266	51,161
Purchases of Federal Reserve and Federal Home Loan Bank stock	(28,322)	(8,275)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	29,878	4,302
Net increase in loans	(191,918)	(147,618)
Proceeds from sale of other real estate owned		939
Bank premises and equipment acquired	(283)	(1,248)
Net cash used in investing activities	(184,399)	(113,000)
Cash Flows From Financing Activities:
Increase in deposits	267,817	73,375
(Decrease) increase in customer repurchase agreements	(28,196)	13,284
(Decrease) increase in short-term borrowings	(50,000)	75,000
Proceeds from exercise of equity compensation plans	338	66
Proceeds from employee stock purchase plan	199	205
Net cash provided by financing activities	190,158	161,930
Net Increase In Cash and Cash Equivalents	14,380	111,019
Cash and Cash Equivalents at Beginning of Period	190,473	368,163
Cash and Cash Equivalents at End of Period	204,853	479,182
Supplemental Cash Flows Information:
Interest paid	15,352	11,517
Income taxes paid	$ 16,500	$ 6,000