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Regulatory Capital Requirements (Tables)
12 Months Ended
Dec. 31, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of actual, required, and well capitalized levels
The actual, required, and well capitalized levels as of December 31, 2022 and 2021 were as follows:    
 At December 31, 2022
 ActualMinimum capital
requirements (1)
Well capitalized
requirements 
 AmountRatioAmountRatioAmountRatio
Total capital (to risk weighted assets)      
Northwest Bancshares, Inc.$1,745,701 16.363 %$1,120,216 10.500 %$1,066,872 10.000 %
Northwest Bank1,568,202 14.712 %1,119,214 10.500 %1,065,918 10.000 %
Tier 1 capital (to risk weighted assets)      
Northwest Bancshares, Inc.1,516,621 14.216 %906,841 8.500 %853,498 8.000 %
Northwest Bank1,452,962 13.631 %906,030 8.500 %852,734 8.000 %
CET 1 capital (to risk weighted assets)
Northwest Bancshares, Inc.1,391,296 13.041 %746,810 7.000 %693,467 6.500 %
Northwest Bank1,452,962 13.631 %746,143 7.000 %692,847 6.500 %
Tier 1 capital (leverage to average assets)      
Northwest Bancshares, Inc.1,516,621 10.817 %560,816 4.000 %701,020 5.000 %
Northwest Bank1,452,962 10.365 %560,706 4.000 %700,882 5.000 %
(1) Amounts and ratios include the 2022 capital conservation buffer of 2.5% with the exception of Tier 1 capital to average assets. For further information related to the capital conservation buffer, see Item 1. Business - Supervision and Regulation.                            
 At December 31, 2021
 ActualMinimum capital
requirements (1)
Well capitalized
requirements 
 AmountRatioAmountRatioAmountRatio
Total capital (to risk weighted assets)      
Northwest Bancshares, Inc.$1,682,487 17.056 %$1,035,786 10.500 %$986,463 10.000 %
Northwest Bank1,551,084 15.738 %1,034,819 10.500 %985,542 10.000 %
Tier 1 capital (to risk weighted assets)      
Northwest Bancshares, Inc.1,475,190 14.954 %838,494 8.500 %789,170 8.000 %
Northwest Bank1,467,362 14.889 %837,711 8.500 %788,434 8.000 %
CET 1 capital (to risk weighted assets)      
Northwest Bancshares, Inc.1,350,125 13.687 %690,524 7.000 %641,201 6.500 %
Northwest Bank1,467,362 14.889 %689,879 7.000 %640,602 6.500 %
Tier 1 capital (leverage to average assets)
Northwest Bancshares, Inc.1,475,190 10.349 %570,160 4.000 %712,699 5.000 %
Northwest Bank1,467,362 10.296 %570,047 4.000 %712,558 5.000 %
(1) Amounts and ratios include the 2021 capital conservation buffer of 2.5% with the exception of Tier 1 capital to average assets. For further information related to the capital conservation buffer, see Item 1. Business - Supervision and Regulation”.