Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 64,228	$ 99,372
Adjustments to reconcile to net cash provided by operating activities:
Provision for credit losses	57,656	6,875
Depreciation and amortization	13,730	11,627
Net amortization of securities premiums and discounts	(240)	(3,764)
Realized securities losses (gains)	545	(821)
Gain on sales of loans	(4,215)	(2,530)
Cash receipts from the sale of loans originated for sale	297,690	164,319
Cash disbursements for loans originated for sale	(309,623)	(169,740)
Deferred income tax benefit	(8,664)	(752)
Gain on sale of other assets	(2,308)	(454)
(Increase)/decrease in interest receivable	(1,084)	1,243
(Decrease)/increase in interest payable	(1,286)	235
Amortization of stock-based compensation arrangements	1,265	888
Excess tax benefit from stock-based compensation arrangements	(219)	(288)
Other, net	3,781	6,255
Net cash provided by operating activities	111,256	112,465
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	18,397	77,672
Net (decrease)/increase in federal funds sold	1,000	(300)
Purchases of held for investment securities	(1,395)	(1,010)
Purchases of available for sale securities	(455,069)	(99,093)
Proceeds from maturities, calls and paydowns of held for investment securities	554	527
Proceeds from maturities, calls and paydowns of available for sale securities	357,845	369,073
Purchase of equity securities	(624)	(2,806)
Proceeds from paydowns and sales of equity securities	445	1,897
Net change in loans	(955,531)	(250,095)
Purchases of premises, equipment and computer software	(48,317)	(19,865)
Purchase of tax credits	(731)	(7,180)
Other, net	6,565	4,587
Net cash (used in) provided by investing activities	(1,076,861)	73,407
FINANCING ACTIVITIES
Net change in deposits	967,250	121,260
Net change in short-term borrowings	(800)	(1,075)
Proceeds from long-term borrowings	3,000
Paydown of long-term borrowings	(3,000)
Issuance of common stock in connection with stock options, net	857	913
Common stock acquired	(3,098)
Cash dividends paid	(31,361)	(29,359)
Net cash provided by financing activities	932,848	91,739
Net (decrease)/increase in cash, due from banks and interest-bearing deposits	(32,757)	277,611
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,868,281	1,424,255
Cash, due from banks and interest-bearing deposits at the end of the period	1,835,524	1,701,866
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	18,741	42,100
Cash paid during the period for income taxes	22,025	26,775
Noncash investing and financing activities:
Cash consideration for acquisitions	2,861	123,457
Fair value of assets acquired in acquisitions	47,838	729,365
Liabilities assumed in acquisitions	45,040	605,908
Unpaid common stock dividends declared	$ 11,105	$ 10,445