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Borrowings (Additional Information) (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2006
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2006
Short-term Debt [Line Items]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   $ 1,400,000,000 $ 1,100,000,000    
Line of credit, maximum borrowing capacity   $ 10,000,000      
Line of credit, expiration date   Dec. 18, 2020      
Security Owned and Pledged as Collateral, Fair Value   $ 712,400,000 714,400,000    
Securities Sold under Agreements to Repurchase   237,984,000 245,868,000    
Amortization of Debt Issuance Costs   115,000 54,000    
Interest on subordinated debentures   3,266,000 3,415,000 $ 3,408,000  
Long-term Line of Credit   0      
Federal Home Loan Bank Advances [Member]          
Short-term Debt [Line Items]          
Line of credit, maximum borrowing capacity   9,900,000 9,900,000    
Long-term Line of Credit   0      
PNC [Member]          
Short-term Debt [Line Items]          
Line of credit, maximum borrowing capacity   50,000,000      
Long-term Line of Credit   0      
Federal Reserve Bank Advances [Member]          
Short-term Debt [Line Items]          
Line of credit, maximum borrowing capacity   114,700,000      
Loans Pledged as Collateral   161,500,000      
Security Owned and Pledged as Collateral, Fair Value   13,000      
Long-term Line of Credit   0      
Subordinated Debentures [Member] | Subordinated Debt [Member]          
Short-term Debt [Line Items]          
Debt Issuance Costs, Net   $ 251,000 $ 366,000    
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt | Minimum [Member]          
Short-term Debt [Line Items]          
Federal Home Loan Bank Advances Maturities Summary Fixed Interest Rate Within One Year From Balance Sheet Date   1.45%      
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt | Maximum [Member]          
Short-term Debt [Line Items]          
Federal Home Loan Bank Advances Maturities Summary Fixed Interest Rate Within One Year From Balance Sheet Date   1.63%      
Subsidiary One [Member] | Junior Subordinated Debt          
Short-term Debt [Line Items]          
Debt Instrument, Interest Rate Terms The contract interest rate of the trust preferred securities is three-month LIBOR plus 140 basis points.        
Debt Instrument, Interest Rate, Stated Percentage   3.36% 4.20%    
Subsidiary Two [Member] | Junior Subordinated Debt          
Short-term Debt [Line Items]          
Debt Instrument, Interest Rate Terms         The contract interest rate of the trust preferred securities is the average three-month LIBOR plus 1.42%.
Debt Instrument, Interest Rate, Stated Percentage   3.41% 3.86%