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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 20,272 $ 17,340 $ 28,804 $ 29,133
Certificates of deposit with other banks 14,778 14,527    
Investment Securities available-for-sale 187,348 162,368    
FHLB and other borrowings 84,403 90,921    
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 20,272 17,340    
Certificates of deposit with other banks 14,778 14,527    
Investment Securities available-for-sale 187,348 162,368    
Loans held for sale 69,057 90,174    
Loans, net 1,085,071 1,043,764    
Mortgage servicing rights 184 190    
Accrued interest receivable 4,904 3,951    
Deposits 1,165,199 1,107,017    
Repurchase agreements 25,045 25,160    
Accrued interest payable 538 741    
Subordinated debt 33,524 33,524    
Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 20,272 17,340    
Certificates of deposit with other banks 14,449 14,985    
Investment Securities available-for-sale 187,348 162,368    
Loans held for sale 69,057 90,174    
Loans, net 1,082,593 1,035,437    
Mortgage servicing rights 184 190    
Accrued interest receivable 4,904 3,951    
Deposits 1,131,413 1,116,174    
Repurchase agreements 25,045 25,160    
Accrued interest payable 538 741    
Subordinated debt 32,275 32,275    
Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 20,272 17,340    
Investment Securities available-for-sale 2,333 897    
Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Certificates of deposit with other banks 14,449 14,985    
Investment Securities available-for-sale 185,015 161,471    
Loans held for sale 69,057 90,174    
Accrued interest receivable 1,224 1,002    
Deposits 1,131,413 1,116,174    
Repurchase agreements 25,045 25,160    
Accrued interest payable 538 741    
Subordinated debt 32,275 32,275    
Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans, net 1,082,593 1,035,437    
Mortgage servicing rights 184 190    
Accrued interest receivable 3,680 2,949    
Interest rate lock commitment | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,849 1,546    
Interest rate lock commitment | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,849 1,546    
Interest rate lock commitment | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,849 1,546    
Mortgage-backed security hedges | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 12 372    
Mortgage-backed security hedges | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 12 372    
Mortgage-backed security hedges | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 12 372    
Interest rate swap | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 111 250    
Derivative liability 111 250    
Interest rate swap | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 111 250    
Derivative liability 111 250    
Interest rate swap | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 111 250    
Derivative liability 111 250    
Interest rate cap | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 34 268    
Interest rate cap | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 34 268    
Interest rate cap | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 34 268    
Forward contracts | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 84,403 90,921    
Forward contracts | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 84,425 90,919    
Forward contracts | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings $ 84,425 $ 90,919