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Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Financial Condition (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Loans $ 5,726,375 $ 5,359,078    
Premises and equipment, net 80,474 81,339    
Other assets 68,409 77,465    
Total assets 7,828,255 7,308,539    
Liabilities and Shareholders' Equity        
Subordinated Debentures outstanding, Amount 170,288 72,167    
Shareholders' equity 975,389 888,127 $ 749,929 $ 719,546
Total liabilities and shareholders’ equity 7,828,255 7,308,539    
Parent Company [Member]        
Assets        
Cash 21,466 16,432    
Loans 14 17    
Investment in subsidiaries 1,014,685 927,765    
Investment in unconsolidated subsidiary trusts 2,192 2,186    
Investment in Jointly-Owned Company 280 9,191    
Premises and equipment, net 3,519 3,715    
Dividends receivable from subsidiaries 5,444 0    
Other assets 5,402 4,996    
Total assets 1,053,002 964,302    
Liabilities and Shareholders' Equity        
Accrued expenses and other liabilities 5,446 4,008    
Subordinated Debentures outstanding, Amount 72,167 72,167    
Shareholders' equity 975,389 888,127    
Total liabilities and shareholders’ equity $ 1,053,002 $ 964,302