Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 129,462	$ 64,228
Adjustments to reconcile to net cash provided by operating activities:
(Benefit from)/provision for credit losses	(8,466)	57,656
Depreciation and amortization	14,574	13,730
Net amortization of securities premiums and discounts	3,069	(240)
Realized securities (gains)/losses	(417)	545
Gain on sales of loans	(5,737)	(4,215)
Cash receipts from the sale of loans originated for sale	294,387	297,690
Cash disbursements for loans originated for sale	(277,480)	(309,623)
Deferred income tax provision/(benefit)	4,662	(8,664)
Gain on sale of other assets	(2,991)	(2,308)
Decrease/(increase) in interest receivable	3,894	(1,084)
Increase/(decrease) in interest payable	69	(1,286)
Amortization of stock-based compensation arrangements	1,604	1,265
Excess tax benefit from stock-based compensation arrangements	(1,622)	(219)
Other, net	6,615	3,781
Net cash provided by operating activities	161,623	111,256
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	12,442	18,397
Net cash paid from sale of assets and liabilities, net of cash received	(13,733)
Net decrease in federal funds sold	15,000	1,000
Purchases of held for investment debt securities	(845)	(1,395)
Purchases of available for sale debt securities	(251,874)	(455,069)
Proceeds from maturities, calls and paydowns of held for investment debt securities	826	554
Proceeds from maturities, calls and paydowns of available for sale debt securities	306,231	357,845
Purchase of equity securities	(490)	(624)
Proceeds from paydowns and sales of equity securities	638	445
Net change in loans	561,540	(955,531)
Purchases of premises, equipment and computer software	(20,859)	(48,317)
Purchase of tax credits	(4,107)	(731)
Other, net	6,454	6,565
Net cash provided by (used in) investing activities	611,223	(1,076,861)
FINANCING ACTIVITIES
Net change in deposits	1,708,393	967,250
Net change in short-term borrowings	2,400	(800)
Proceeds from long-term borrowings		3,000
Paydown of long-term borrowings	0	(3,000)
Proceeds from issuance of subordinated notes, net of debt issuance costs	59,150
Issuance of common stock in connection with stock options, net	1,722	857
Common stock acquired	(11,664)	(3,098)
Net cash settlement of options	(5,479)	0
Cash dividends paid	(33,414)	(31,361)
Net cash provided by financing activities	1,721,108	932,848
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	2,493,954	(32,757)
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,616,912	1,868,281
Cash, due from banks and interest-bearing deposits at the end of the period	4,110,866	1,835,524
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	8,356	18,741
Cash paid during the period for income taxes	27,800	22,025
Noncash investing and financing activities:
Cash consideration for acquisitions	21,000	2,861
Fair value of assets acquired in acquisitions	283,962	47,838
Liabilities assumed in acquisitions	258,165	45,040
Unpaid common stock dividends declared	$ 11,802	$ 11,105