CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income	$ 57,719	$ 57,693
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	(5,747)
Depreciation, amortization and accretion, net	15,581	13,643
Deferred income tax provision	15,059	355
Stock-based compensation	3,135	3,037
Other losses	1,566	1,090
Originations of loans held for sale	(6,566)	(61,552)
Proceeds from sales of loans held for sale	6,194	67,067
Net (gains) losses on sales of loans originated for investment and held for sale		(1,486)
Change in assets and liabilities:
Net (increase) decrease in other assets	(33,509)	27,030
Net increase in other liabilities	12,830	47,323
Net cash provided by operating activities	66,262	154,200
Available-for-sale securities:
Proceeds from maturities and principal repayments	383,290	448,655
Proceeds from calls and sales	970	145
Purchases	(563,925)	(1,178,760)
Other investments:
Proceeds from sales	2,690	2,404
Purchases	(2,841)	(14,515)
Loans:
Net decrease (increase) in loans and leases resulting from originations and principal repayments	180,505	(45,193)
Proceeds from sales of loans originated for investment		220
Purchases of loans	(114,677)	(558)
Purchases of premises, equipment and software	(2,695)	(3,791)
Proceeds from sales of other real estate owned	176
Other		(1,171)
Net cash used in investing activities	(116,507)	(792,564)
Cash flows from financing activities
Net increase in deposits	454,284	905,958
Dividends paid	(33,151)	(33,812)
Stock tendered for payment of withholding taxes	(3,197)	(2,373)
Common stock repurchased		(9,543)
Net cash provided by financing activities	417,936	860,230
Net increase in cash and cash equivalents	367,691	221,866
Cash and cash equivalents at beginning of period	1,258,469	1,040,944
Cash and cash equivalents at end of period	1,626,160	1,262,810
Supplemental disclosures
Interest paid	3,545	8,894
Income taxes paid, net of income tax refunds	2,124	981
Noncash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for new lease obligations	761	6,864
Transfers from loans and leases to land held for sale		$ 1,840
Transfers to loans and leases to land held for sale	$ (834)