Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 100,329	$ 146,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,178	15,475
Recovery from credit losses	(8,449)	(58,420)
Deferred income taxes	49,073	21,037
Share-based compensation expense	8,486	6,092
Accretion of discount related to acquired loans	(6,741)	(10,416)
Losses on disposal of premises and equipment	812	753
(Gains) losses on sale of bank properties held for sale and repossessed real estate	(624)	2,349
Net amortization of premiums on investment securities	7,767	9,481
Bank properties held for sale and repossessed real estate write downs	195	469
Fair value adjustment for loans held for sale	6,026	5,852
Originations and purchases of loans held for sale	(645,339)	(842,796)
Proceeds from sales of loans held for sale	702,505	795,124
Gains on sales of loans held for sale	(1,845)	(20,709)
Increase in cash surrender value of BOLI	(5,260)	(3,280)
Net change in:
Accrued interest receivable	(4,630)	4,169
Prepaid assets	3,309	1,685
Operating leases	33	1,638
Bank owned life insurance		24
Trading securities	3,455	(41,412)
Derivative assets	5,882	397,570
Miscellaneous other assets	(75,613)	(172,197)
Accrued interest payable	3,035	1,394
Accrued income taxes	(20,188)	19,436
Derivative liabilities	(1,968)	(402,575)
Miscellaneous other liabilities	35,761	421,343
Net cash provided by operating activities	172,189	299,035
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	414,438
Proceeds from maturities and calls of investment securities held to maturity	40,152	16,746
Proceeds from maturities and calls of investment securities available for sale	158,642	217,712
Proceeds from sales and redemptions of other investment securities	13,216	155
Purchases of investment securities available for sale	(980,298)	(850,593)
Purchases of investment securities held to maturity	(1,049,722)	(276,725)
Purchases of other investment securities	(19,890)	(1,181)
Net (increase) decrease in loans	(243,652)	178,078
Net cash received from (paid in) acquisitions	250,115	(39,929)
Recoveries of loans previously charged off	3,168	3,396
Purchase of bank owned life insurance	(80,000)
Purchases of premises and equipment	(4,983)	(5,580)
Proceeds from sale of bank properties held for sale and repossessed real estate	5,449	6,599
Proceeds from sale of premises and equipment	453	952
Net cash used in investing activities	(1,492,912)	(750,370)
Cash flows from financing activities:
Net increase in deposits	693,341	1,749,783
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	(60,830)	98,915
Common stock repurchases	(88,815)	(804)
Dividends paid	(33,922)	(33,448)
Stock options exercised	408	1,771
Net cash provided by financing activities	510,182	1,816,217
Net increase (decrease) in cash and cash equivalents	(810,541)	1,364,882
Cash and cash equivalents at beginning of period	6,843,147	4,609,255
Cash and cash equivalents at end of period	6,032,606	5,974,137
Cash paid for:
Interest	5,956	15,083
Income taxes	1,231	2,072
Recognition of operating lease assets in exchange for lease liabilities	12,428	1,298
Acquisitions:
Fair value of tangible assets acquired	3,499,774	34,838
Other intangible assets acquired	20,791
Liabilities assumed	3,205,694	2,343
Net identifiable assets acquired over liabilities assumed	342,939	15,816
Common stock issued in acquisition	659,772
Real estate acquired in full or in partial settlement of loans	$ 1,151	$ 1,631