CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net income	$ 129,260	$ 117,079
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	13,800	(4,747)
Depreciation, amortization and accretion, net	21,985	30,872
Deferred income tax (benefit) provision	(2,024)	14,228
Stock-based compensation	4,730	5,747
Other losses	1,122	2,304
Originations of loans held for sale	(5,613)	(10,256)
Proceeds from sales of loans held for sale	6,726	9,744
Net losses on sales of loans originated for investment and held for sale	20	36
Change in assets and liabilities:
Net decrease (increase) in other assets	29,087	(49,614)
Net (decrease) increase in other liabilities	(11,483)	50,351
Net cash provided by operating activities	187,610	165,744
Available-for-sale securities:
Proceeds from maturities and principal repayments	223,102	598,865
Proceeds from calls and sales	25,237	1,080
Purchases		(913,268)
Held-to-maturity securities:
Proceeds from maturities and principal repayments	153,133	137,014
Proceeds from calls	7,705	110
Purchases		(79,470)
Other investments:
Proceeds from sales	61,985	4,132
Purchases	(81,240)	(21,386)
Loans:
Net increase in loans and leases resulting from originations and principal repayments	(240,357)	(168,986)
Purchases of loans	(48,741)	(149,512)
Proceeds from bank-owned life insurance	5,281
Purchases of premises, equipment and software	(4,191)	(5,966)
Proceeds from sales of other real estate owned	34	176
Other	(2,882)	(1,744)
Net cash provided by (used in) investing activities	99,066	(598,955)
Cash flows from financing activities
Net (decrease) increase in deposits	(610,863)	785,308
Net decrease in short-term borrowings	(75,000)
Proceeds from long-term borrowings	500,000
Dividends paid	(66,290)	(66,363)
Stock tendered for payment of withholding taxes	(3,179)	(3,527)
Proceeds from employee stock purchase plan	163
Common stock repurchased		(7,000)
Net cash (used in) provided by financing activities	(255,169)	708,418
Net increase in cash and cash equivalents	31,507	275,207
Cash and cash equivalents at beginning of period	526,624	1,258,469
Cash and cash equivalents at end of period	558,131	1,533,676
Supplemental disclosures
Interest paid	97,867	8,015
Income taxes paid, net of income tax refunds	29,928	5,356
Noncash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for new lease obligations	1,680	4,979
Transfers to loans and leases to land held for sale		834
Transfers to loans held for sale from loans and leases	$ 1,133
Transfers of securities from available-for-sale to held-to-maturity		$ 4,133,363