Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 286,981	$ 275,497	$ 178,040
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	28,021	(14,600)	76,920
Depreciation and amortization of premises and equipment	30,201	28,802	28,803
Net amortization of investment securities premiums	12,824	16,031	12,222
Investment securities losses (gains), net	27	(33,516)	(3,053)
Loss (gain) on sales of mortgage loans held for sale	(8,816)	(24,379)	(53,599)
Proceeds from sales of mortgage loans held for sale	455,607	1,050,943	1,536,174
Originations of mortgage loans held for sale	(418,287)	(978,446)	(1,528,633)
Intangible amortization	1,731	589	529
Amortization of issuance costs and discounts on long-term borrowings	724	1,846	1,128
Debt extinguishment costs	0	33,249	2,877
Stock-based compensation	14,000	8,402	7,529
Increase (Decrease) in Deferred Income Taxes	(117,849)	(417)	(29,173)
Change in life insurance cash surrender value	(92,228)	(90,105)	(26,348)
Other changes, net	405,331	68,376	(46,051)
Total adjustments	311,285	66,775	(20,675)
Net cash provided by (used in) operating activities	598,266	342,272	157,365
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS securities	196,411	359,137	215,150
Proceeds from principal repayments and maturities of AFS securities	583,444	469,393	430,845
Proceeds from principal repayments and maturities of HTM securities	109,759	117,958	93,823
Purchase of AFS securities	(845,744)	(1,309,470)	(1,134,380)
Purchase of HTM securities	(30,959)	(443,081)	0
Sale of Visa Shares	0	33,962	0
Decrease (increase) of FRB and FHLB stock	(72,551)	34,494	5,293
Net decrease (increase) in loans	(1,407,289)	561,664	(2,072,831)
Net purchases of premises and equipment	(21,246)	(17,679)	(20,237)
Net cash paid for acquisition	(21,811)	(1,982)	(1,884)
Net change in tax credit investments	(29,071)	(18,363)	(15,259)
Net cash provided by (used in) investing activities	(1,539,058)	(213,967)	(2,499,480)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in demand and savings deposits	(1,198,319)	1,315,139	3,951,905
Net increase (decrease) in time deposits	(257,823)	(580,847)	(506,611)
Proceeds from (Repayments of) Short-Term Debt	1,629,870	(212,682)	(132,277)
Repayments of Senior Debt	81,496	710,633	85,410
Proceeds from Issuance of Senior Long-Term Debt	0	0	375,000
Net proceeds from issuance of preferred stock	0	0	192,878
Net proceeds from issuance of common stock	7,876	7,437	7,375
Dividends paid	(116,009)	(112,028)	(90,956)
Acquisition of treasury stock	0	(43,909)	(39,748)
Net cash provided by (used in) financing activities	(15,901)	(337,523)	3,672,156
Net Increase in Cash and Cash Equivalents	(956,693)	(209,218)	1,330,041
Cash and Cash Equivalents at Beginning of Year	1,638,614	1,847,832	517,791
Cash and Cash Equivalents at End of Year	681,921	1,638,614	1,847,832
Cash paid during period for:
Interest	80,019	63,047	112,140
Income taxes	32,669	27,870	16,190
Supplemental schedule of certain noncash activities
Transfer of AFS securities to HTM securities	$ 479,008	$ 376,165	$ 0