Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 147,920	$ 134,277
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	34,291	(5,450)
Depreciation and amortization of premises and equipment	14,675	14,963
Net amortization of investment securities premiums	5,829	7,027
Investment securities gains, net	(19)	(27)
Gain on sales of mortgage loans held for sale	(2,277)	(5,568)
Proceeds from sales of mortgage loans held for sale	132,609	297,511
Originations of mortgage loans held for sale	(137,741)	(273,704)
Intangible amortization	1,746	353
Amortization of issuance costs and discounts on long-term borrowings	360	379
Stock-based compensation	4,240	6,375
Net change in deferred federal income tax	19,232	(96,703)
Net change in accrued salaries and benefits	(12,163)	1,274
Net change in life insurance cash surrender value	(20,433)	(28,742)
Other changes, net	28,641	(67,652)
Total adjustments	68,990	(149,964)
Net cash provided by (used in) operating activities	216,910	(15,687)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS securities	80,666	109,252
Proceeds from principal repayments and maturities of AFS securities	55,102	316,037
Proceeds from principal repayments and maturities of HTM securities	29,815	67,230
Purchase of AFS securities	(64,996)	(501,642)
Purchase of HTM securities	0	(9,541)
Net change in FRB and FHLB stock	5,968	(4,511)
Net change of federal funds sold	0	(30,500)
Net change in loans	(781,310)	(590,797)
Net purchases of premises and equipment	(11,019)	(6,245)
Proceeds from Life Insurance Policy	45	0
Net change in tax credit investments	(18,436)	(18,735)
Net cash used in investing activities	(704,165)	(669,452)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net change in demand and savings deposits	(796,291)	(253,864)
Net change in time deposits and broker deposits	1,353,293	(175,769)
Net change in other borrowings	(152,453)	39,967
Repayments of senior debt and subordinated debt	0	(65,140)
Net proceeds from issuance of common stock	1,009	2,698
Dividends paid	(55,073)	(51,693)
Acquisition of treasury stock	(40,449)	0
Net cash provided by (used in) financing activities	310,036	(503,801)
Net decrease in Cash and Cash Equivalents	(177,219)	(1,188,940)
Cash and Cash Equivalents at Beginning of Period	681,921	1,638,614
Cash and Cash Equivalents at End of Period	504,702	449,674
Cash paid during the period for:
Interest	162,377	24,149
Income taxes	15,183	15,692
Supplemental Schedule of Certain Noncash Activities:
Transfer of AFS securities to HTM securities	$ 0	$ 479,008