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Loans Receivable, Credit Quality for Loans and the Allowance for Loan Losses - Summary of Loans Acquired (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Nov. 01, 2013
Union Bank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition   $ 102,994
Contractual cash flows not expected to be collected   (14,979)
Expected cash flows at acquisition   88,015
Interest component of expected cash flows   (12,664)
Basis in acquired loans at acquisition - estimated fair value   75,351
Union Bank [Member] | Purchased Credit Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition   10,290
Contractual cash flows not expected to be collected   (5,487)
Expected cash flows at acquisition   4,803
Interest component of expected cash flows   (386)
Basis in acquired loans at acquisition - estimated fair value   4,417
Union Bank [Member] | Purchased Non-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition   92,704
Contractual cash flows not expected to be collected   (9,492)
Expected cash flows at acquisition   83,212
Interest component of expected cash flows   (12,278)
Basis in acquired loans at acquisition - estimated fair value   $ 70,934
Citizens National Bank of Meyersdale [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition $ 82,674  
Contractual cash flows not expected to be collected (13,754)  
Expected cash flows at acquisition 68,920  
Interest component of expected cash flows (11,058)  
Basis in acquired loans at acquisition - estimated fair value 57,862  
Citizens National Bank of Meyersdale [Member] | Purchased Credit Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition 894  
Contractual cash flows not expected to be collected (237)  
Expected cash flows at acquisition 657  
Interest component of expected cash flows (217)  
Basis in acquired loans at acquisition - estimated fair value 440  
Citizens National Bank of Meyersdale [Member] | Purchased Non-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required principal and interest at acquisition 81,780  
Contractual cash flows not expected to be collected (13,517)  
Expected cash flows at acquisition 68,263  
Interest component of expected cash flows (10,841)  
Basis in acquired loans at acquisition - estimated fair value $ 57,422