Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 90,701	$ 80,345
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	5,935	5,946
Provision for loan losses	18,550	1,565
Securities premium amortization (discount accretion), net	17,018	12,217
Gain on sale of assets, net	(3,719)	(804)
Deferred federal income tax (expense) benefit	(407)	2,206
Change in loans held-for-sale	(36,018)	(631)
Change in other assets	(16,452)	2,649
Change in other liabilities	38,274	5,219
Total adjustments	23,181	28,367
Net cash provided by operating activities	113,882	108,712
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash received in acquisition of TB&T Bancshares, Inc.	61,028	0
Net decrease in interest-bearing time deposits in banks	0	498
Activity in available-for-sale securities:
Sales	252,958	66,052
Maturities	5,654,371	2,201,877
Purchases	(6,392,611)	(2,280,686)
Net increase in loans	(614,577)	(88,629)
Purchases of bank premises and equipment	(7,681)	(6,360)
Proceeds from sale of bank premises and equipment and other assets	1,144	187
Net cash used in investing activities	(1,045,368)	(107,061)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	638,726	51,445
Net increase in interest-bearing deposits	365,985	137,932
Net increase (decrease) in borrowings	67,868	(106,701)
Common stock transactions:
Proceeds from stock issuances	2,481	3,186
Dividends paid	(33,371)	(28,463)
Repurchase of stock	(8,008)	0
Net cash provided by financing activities	1,033,681	57,399
NET INCREASE IN CASH AND CASH EQUIVALENTS	102,195	59,050
CASH AND CASH EQUIVALENTS, beginning of period	282,604	248,647
CASH AND CASH EQUIVALENTS, end of period	384,799	307,697
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	10,246	15,062
Federal income taxes paid	0	12,752
Transfer of loans and bank premises to other real estate	45	364
Investment securities purchased but not settled	33,554	29,355
Restricted stock grant to officers and directors	913	1,426
Stock issued in acquisition of TB&T Bancshares, Inc.	$ 220,273	$ 0