Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From Operating Activities:
Net Income	$ 84,663	$ 71,990
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	4,884	9,219
Depreciation and amortization	4,868	4,628
Gains on sale of loans	(6,740)	(8,464)
Securities premium amortization (discount accretion), net	2,799	3,412
Origination of loans held for sale	(481,917)	(606,213)
Proceeds from sale of loans held for sale	514,306	584,051
Net increase in cash surrender value of BOLI	(1,108)	(1,171)
Decrease (increase) deferred income tax benefit	1,293	(754)
Decrease in value of other real estate owned		200
Net loss (gain) on sale of other real estate owned	301	(657)
Net gain on sale of investment securities	(542)	(1,123)
Stock-based compensation expense	4,199	5,159
Net tax benefits from stock compensation	460
Excess tax benefits realized from stock compensation		(166)
Increase in other assets	(23,059)	(8,590)
Increase in other liabilities	9,553	13,035
Net cash provided by operating activities	113,960	64,556
Cash Flows From Investing Activities:
Decrease in interest bearing deposits with other banks and short-term investments		784
Purchases of available for sale investment securities	(144,554)	(106,163)
Proceeds from maturities of available for sale securities	55,732	65,727
Proceeds from sale/call of available for sale securities	70,079	94,217
Purchases of Federal Reserve and Federal Home Loan Bank stock	(27,665)	(3,017)
Proceeds from redemption of Federal Reserve and Federal Home Loan Bank stock	18,285
Net increase in loans	(408,447)	(491,720)
Proceeds from sale of other real estate owned	2,144	3,614
Bank premises and equipment acquired	(2,459)	(4,836)
Net cash used in investing activities	(436,885)	(441,394)
Cash Flows From Financing Activities:
Increase in deposits	197,838	399,705
Increase (decrease) in customer repurchase agreements	4,693	(714)
Increase in short-term borrowings	200,000	50,000
Increase in long-term borrowings	293	147,491
Proceeds from exercise of equity compensation plans	257	282
Excess tax benefits realized from stock compensation		166
Proceeds from employee stock purchase plan	631	572
Net cash provided by financing activities	403,712	597,502
Net Increase In Cash and Cash Equivalents	80,787	220,664
Cash and Cash Equivalents at Beginning of Period	368,163	298,363
Cash and Cash Equivalents at End of Period	448,950	519,027
Supplemental Cash Flows Information:
Interest paid	31,257	18,196
Income taxes paid	52,800	47,950
Non-Cash Investing Activities
Transfers from loans to other real estate owned	$ 1,145	$ 2,500