Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 53,397	$ 52,568
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	3,221	3,074
Provision for credit losses	808	2,781
Securities premium amortization, net	11,153	13,770
Gain on sale of securities and other assets, net	0	(976)
Stock-based compensation	1,129	952
Net tax benefit from stock-based compensation	102	93
Change in loans held-for-sale	(1,797)	48
Change in other assets	(4,245)	15,851
Change in other liabilities	11,875	7,755
Total adjustments	22,246	43,348
Net cash provided by operating activities	75,643	95,916
Activity in available-for-sale securities:
Sales	0	145,948
Maturities	3,644,519	116,922
Purchases	(3,629,507)	(3,298)
Net increase in loans held-for-investment	(80,652)	(133,974)
Purchases of bank premises, equipment and software	(3,912)	(6,347)
Proceeds from sale of bank premises and equipment and other assets	41	2,423
Net cash provided by (used in) investing activities	(69,511)	121,674
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in noninterest-bearing deposits	(87,439)	(170,797)
Net increase in interest-bearing deposits	238,947	101,708
Net increase (decrease) in repurchase agreements and borrowings	(69,981)	(9,581)
Common stock transactions:
Proceeds from stock option exercises/stock unit conversions/restricted stock activity	1,623	884
Dividends paid	(25,712)	(24,271)
Net cash provided by (used in) financing activities	57,438	(102,057)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	63,570	115,533
CASH AND CASH EQUIVALENTS, beginning of period	536,591	330,678
CASH AND CASH EQUIVALENTS, end of period	600,161	446,211
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	51,106	22,726
Transfer of loans to other real estate	$ 454	$ 175