CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income	$ 177,633	$ 187,481
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	15,500	21,300
Depreciation, amortization and accretion, net	28,570	32,425
Deferred income tax benefit	(1,224)	(13,322)
Stock-based compensation	9,771	7,163
Gain on property insurance proceeds	(2,559)
Other (gains) losses	(566)	1,243
Originations of loans held for sale	(28,866)	(11,483)
Proceeds from sales of loans held for sale	28,572	12,613
Change in assets and liabilities:
Net decrease in other assets	(46,511)	20,495
Net decrease in other liabilities	23,368	(44,095)
Net cash provided by operating activities	203,688	213,820
Available-for-sale securities:
Proceeds from maturities and principal repayments	222,716	345,798
Proceeds from calls and sales	41,350	25,236
Held-to-maturity securities:
Proceeds from maturities and principal repayments	216,595	238,722
Proceeds from calls	1,615	7,950
Other investments:
Proceeds from sales	14,926	78,746
Purchases	(28,064)	(102,639)
Loans:
Net decrease (increase) in loans and leases resulting from originations and principal repayments	120,579	(214,539)
Proceeds from sales of loans originated for investment	27,526
Purchases of loans	(18,012)	(48,911)
Proceeds from bank-owned life insurance	1,920	5,632
Proceeds from property insurance	2,559
Purchases of premises, equipment and software	(17,419)	(8,283)
Other	104	313
Net cash provided by investing activities	586,395	328,025
Cash flows from financing activities
Net decrease in deposits	(1,104,955)	(177,540)
Proceeds of short-term borrowings	250,000
Repayment of short-term borrowings	500,000
Net decrease in other short-term borrowings		(75,000)
Proceeds from long-term borrowings		500,000
Dividends paid	(99,655)	(99,468)
Stock tendered for payment of withholding taxes	(2,699)	(3,196)
Proceeds from employee stock purchase plan	141	163
Net cash (used in) provided by financing activities	(1,457,168)	144,959
Net (decrease) increase in cash and cash equivalents	(667,085)	686,804
Cash and cash equivalents at beginning of year	1,739,897	526,624
Cash and cash equivalents at end of year	1,072,812	1,213,428
Supplemental disclosures
Interest paid	280,018	173,712
Income taxes paid, net of income tax refunds	39,568	50,098
Noncash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for new lease obligations	3,372	3,239
Transfers to loans held for sale from loans and leases	27,096	1,133
Obligation to fund low-income housing partnerships	$ 56,640	$ 25,836