CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 84,857	$ 61,600
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,647	22,738
Provision for loan losses	14,332	10,235
Net amortization of premium on securities	18,958	20,186
Securities gains, net	(1,037)	(5,553)
Unrealized gain on equity securities, net	(97)	0
Stock based compensation	3,689	3,588
Loans originated for sale	(551,328)	(548,768)
Proceeds on sales of loans held for sale	594,529	586,202
Net gains on sale of loans held for sale	(13,939)	(11,968)
Increase in accrued interest receivable	(5,422)	(1,449)
Decrease in prepaid expenses	2,243	838
Decrease in accrued interest payable	1,121	1,104
Capitalization of servicing rights	(4,404)	(5,993)
Valuation allowance on servicing rights	(12)	(29)
Loss on sales/valuations of assets, net	2,243	1,642
Net excess tax benefit from stock based compensation	672	1,121
Other, net	(1,979)	(5,637)
NET CASH PROVIDED BY OPERATING ACTIVITIES	167,073	129,857
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of time deposits in other financial institutions	(1,000)	0
Proceeds from the sale of securities available for sale	694,872	1,127,091
Proceeds from the redemption of time deposits in other financial institutions	8,767	12,171
Proceeds from the maturity of and principal paydowns on securities available for sale	172,702	161,827
Proceeds from the maturity of and principal paydowns on securities held to maturity	13,169	6,645
Proceeds from the maturity of and principal paydowns on time deposits in other financial institutions	5,829	24,931
Proceeds from the maturity of and principal paydowns on other investments	2,038	2,574
Purchase of securities available for sale	(940,607)	(1,299,492)
Purchase of other investments	(2,411)	(1,012)
Net (increase) decrease in loans	(13,737)	45,139
Purchase of bank owned life insurance policies	(2,000)	(2,000)
Proceeds from sale of mortgage servicing rights	0	5,137
Capital expenditures	(11,793)	(6,876)
Net cash and cash equivalents received in acquisitions	212,197	71,089
Proceeds from the sale of equipment	998	1,845
Proceeds on sale of OREO and other repossessed assets	3,128	7,578
NET CASH PROVIDED BY INVESTING ACTIVITIES	142,152	156,647
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in demand deposits	156,497	181,206
Net increase (decrease) in savings deposits	130,704	(179,721)
Net decrease in time deposit accounts	(122,795)	(8,582)
Proceeds on short-term revolving credit line	25,000	20,000
Repayments on short-term revolving credit line	(25,000)	(15,000)
Net decrease in short-term borrowings	(183,552)	(168,667)
Proceeds from short term FHLB advances	355,602	186,039
Repayments of short term FHLB advances	(365,602)	(191,405)
Proceeds from other borrowings	30,131	0
Repayments of other borrowings	(56,221)	(8,573)
Purchase of treasury stock	(97)	(440)
Proceeds from issuance of common stock	286	804
Dividends paid	(12,806)	(9,153)
NET CASH USED BY FINANCING ACTIVITIES	(67,853)	(193,492)
Net increase in cash and cash equivalents	241,372	93,012
Cash and cash equivalents at beginning of year	196,003	158,724
CASH AND CASH EQUIVALENTS AT END OF PERIOD	437,375	251,736
Supplemental disclosures:
Cash paid for income/franchise taxes	14,754	10,775
Cash paid for interest	34,725	23,034
Loans transferred to OREO	5,016	4,955
Transfer of premises from premises, furniture and equipment, net, to premises, furniture and equipment held for sale	3,415	0
Deposits transferred to held for sale	50,312	0
Loans transferred to held for sale	31,379	0
Purchases of securities available for sale, accrued, not settled	3,481	2,063
Sales of securities available for sale, accrued, not settled	0	125
Conversion of convertible debt to common stock	0	558
Conversion of Series D preferred stock to common stock	938	419
Stock consideration granted for acquisitions	$ 238,075	$ 175,196