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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Outstanding Financial Instruments Contract Amounts Represent Credit Risk The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk:
(In thousands)At March 31,
2022		At December 31, 2021
Commitments to extend credit$10,333,453 $6,870,095 
Standby letters of credit379,495 224,061 
Commercial letters of credit68,544 58,175 
Total credit-related financial instruments with off-balance sheet risk$10,781,492 $7,152,331 
Activity In Allowance For Losses
The following table summarizes the change in the ACL on loans and leases by portfolio segment:
 At or for the three months ended March 31,
20222021
(In thousands)Commercial PortfolioConsumer PortfolioTotalCommercial PortfolioConsumer PortfolioTotal
ACL on loans and leases:
Balance, beginning of period$257,877 $43,310 $301,187 $312,244 $47,187 $359,431 
Initial allowance for PCD loans and leases (1)
78,376 9,669 88,045 — — — 
Provision (benefit)184,327 4,741 189,068 (23,653)(2,106)(25,759)
Charge-offs(11,248)(1,120)(12,368)(6,321)(2,974)(9,295)
Recoveries1,364 2,075 3,439 1,636 2,338 3,974 
Balance, end of period$510,696 $58,675 $569,371 $283,906 $44,445 $328,351 
Individually evaluated for impairment32,736 12,057 44,793 14,809 4,913 19,722 
Collectively evaluated for impairment$477,960 $46,618 $524,578 $269,097 $39,532 $308,629 
(1)Represents the establishment of the initial reserve for PCD loans and leases, which is reported net of $48.3 million of day one charge-offs recognized at the date of acquisition in accordance with GAAP.
The following table summarizes the activity in the ACL on unfunded loan commitments:
Three months ended March 31,
(In thousands)20222021
Balance, beginning of period$13,104 $12,755 
ACL assumed from Sterling6,749 — 
(Benefit) provision for credit losses(213)45 
Balance, end of period$19,640 $12,800