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Fair Value Disclosures - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
loan
property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Reversal of other noninterest expense $ 303,000    
Adjustment of Contingent Consideration (275,000) $ 796,000  
Valuation adjustments for loans held for sale 0   $ 0
Carrying value of impaired loans and leases held for investment 36,692,000    
Valuation allowance of impaired loans held for investment 131,000   235,000
Servicing rights carrying amount before valuation allowance 6,500,000   6,500,000
Servicing rights valuation allowance $ 0   0
Number of properties written-down | property 2    
OREO write-downs $ 199,000    
Sterner Insurance Associates Inc [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Adjustment of Contingent Consideration (303,000) 490,000  
Girard Partners [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Adjustment of Contingent Consideration 28,000 238,000  
John T. Fretz Insurance Agency [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Adjustment of Contingent Consideration   $ 68,000  
Held for Investment [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of impaired loans and leases held for investment 36,700,000   43,915,000
Valuation allowance of impaired loans held for investment 131,000   235,000
Lease Financings [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of impaired loans and leases held for investment 5,000,000   $ 0
Valuation allowance of impaired loans held for investment $ 886,000    
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of loans with unrealized gain | loan 2    
Unrealized gain on loans $ 84,000