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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Credit Related Financial Instruments The following table summarizes the outstanding amounts of credit-related financial instruments with off-balance sheet risk:
At December 31,
(In thousands)20222021
Commitments to extend credit$11,237,496 $6,870,095 
Standby letters of credit380,655 224,061 
Commercial letters of credit53,512 58,175 
Total credit-related financial instruments with off-balance sheet risk$11,671,663 $7,152,331 
Unfunded Commitments, Allowance For Credit Loss The following table summarizes the activity in the ACL on unfunded loan commitments, which provides for the unused portion of commitments to lend that are not unconditionally cancellable by the Company:
Years ended December 31,
(In thousands)202220212020
Balance, beginning of period$13,104 $12,755 $2,367 
Adoption of CECL— — 9,139 
ACL established in the Sterling merger6,749 — — 
Provision for credit losses7,854 349 1,249 
Balance, end of period$27,707 $13,104 $12,755