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	$ 61,600	$ 61,187
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,738	22,975
Provision for loan losses	10,235	9,513
Net amortization of premium on securities	20,186	24,093
Securities gains, net	(5,553)	(9,732)
Stock based compensation	3,588	3,073
Loans originated for sale	(548,768)	(863,354)
Proceeds on sales of loans held for sale	586,202	883,758
Net gains on sale of loans held for sale	(11,968)	(23,938)
Decrease in accrued interest receivable	(1,449)	(1,054)
(Increase) decrease in prepaid expenses	838	(128)
Increase in accrued interest payable	1,104	332
Capitalization of servicing rights	(5,993)	(9,856)
Valuation allowance on commercial servicing rights	(29)	41
Write downs and losses on sales of assets, net	1,642	1,064
Net excess tax benefit from stock based compensation	1,121	1,121
Other, net	(5,637)	(2,419)
NET CASH PROVIDED BY OPERATING ACTIVITIES	129,857	96,676
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of securities available for sale	1,127,091	768,617
Proceeds from the sale of securities held to maturity	0	4,557
Proceeds from the sale of other investments	0	4,722
Proceeds from the redemption of time deposits in other financial institutions	12,171	0
Proceeds from the maturity of and principal paydowns on securities available for sale	161,827	130,549
Proceeds from the maturity of and principal paydowns on securities held to maturity	6,645	8,271
Proceeds from the maturity of and principal paydowns on time deposits in other financial institutions	24,931	250
Proceeds from the maturity of and principal paydowns on other investments	2,574	0
Purchase of securities available for sale	(1,299,492)	(888,903)
Purchase of other investments	(1,012)	(1,875)
Net decrease in loans	45,139	138,725
Purchase of bank owned life insurance policies	(2,000)	0
Proceeds from bank owned life insurance policies	0	111
Proceeds from sale of mortgage servicing rights	5,137	0
Capital expenditures	(6,876)	(8,318)
Net cash and cash equivalents received in acquisitions	71,089	8,084
Proceeds from the sale of equipment	1,845	686
Proceeds on sale of OREO and other repossessed assets	7,578	3,266
NET CASH PROVIDED BY INVESTING ACTIVITIES	156,647	168,742
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand deposits	181,206	160,313
Net increase (decrease) in savings deposits	(179,721)	51,530
Net decrease in time deposit accounts	(8,582)	(353,084)
Proceeds on short-term revolving credit line	20,000	0
Repayments on short-term revolving credit line	(15,000)	0
Net decrease in short-term borrowings	(168,667)	(101,409)
Proceeds from short term FHLB advances	186,039	243,100
Repayments of short term FHLB advances	(191,405)	(257,250)
Proceeds from other borrowings	0	40,000
Repayments of other borrowings	(8,573)	(15,562)
Redemption of preferred stock	0	(81,698)
Purchase of treasury stock	(440)	(2,293)
Proceeds from issuance of common stock	804	1,863
Dividends paid	(9,153)	(7,638)
NET CASH USED BY FINANCING ACTIVITIES	(193,492)	(322,128)
Net increase (decrease) in cash and cash equivalents	93,012	(56,710)
Cash and cash equivalents at beginning of year	158,724	258,799
CASH AND CASH EQUIVALENTS AT END OF PERIOD	251,736	202,089
Supplemental disclosures:
Cash paid for income/franchise taxes	10,775	16,550
Cash paid for interest	23,034	23,864
Loans transferred to OREO	4,955	1,359
Purchases of securities available for sale, accrued, not settled	2,063	0
Sales of securities available for sale, accrued, not settled	125	250
Conversion of convertible debt to common stock	558	0
Conversion of Series D preferred stock to common stock	419	0
Stock consideration granted for acquisitions	$ 175,196	$ 57,433