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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 22,045 $ 20,305 $ 20,272 $ 17,340
Certificates of deposit with other banks 14,778 14,778    
Securities available-for-sale, at fair value 216,714      
Securities available-for-sale, including equity and other   231,507    
Equity securities 9,592      
FHLB and other borrowings 122,000 152,169    
Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 22,045 20,305    
Certificates of deposit with other banks 14,778 14,778    
Securities available-for-sale, at fair value 216,714      
Securities available-for-sale, including equity and other   231,507    
Equity securities 9,592      
Loans held for sale 63,706 66,794    
Loans, net 1,285,021 1,096,063    
Mortgage servicing rights 175 182    
Accrued interest receivable 6,185 5,296    
Deposits 1,379,186 1,159,580    
Repurchase agreements 15,755 22,403    
Accrued interest payable 911 643    
Subordinated debt 18,524 33,524    
Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 22,045 20,305    
Certificates of deposit with other banks 14,370 14,695    
Securities available-for-sale, at fair value 216,714      
Securities available-for-sale, including equity and other   231,507    
Equity securities 9,592      
Loans held for sale 63,706 66,794    
Loans, net 1,273,339 1,093,824    
Mortgage servicing rights 175 182    
Accrued interest receivable 6,185 5,296    
Deposits 1,317,934 1,126,615    
Repurchase agreements 15,755 22,403    
Accrued interest payable 911 643    
Subordinated debt 19,304 35,117    
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 22,045 20,305    
Certificates of deposit with other banks 0 0    
Securities available-for-sale, at fair value 0      
Securities available-for-sale, including equity and other   1,607    
Equity securities 6,020      
Loans held for sale 0 0    
Loans, net 0 0    
Mortgage servicing rights 0 0    
Accrued interest receivable 0 0    
Deposits 0 0    
Repurchase agreements 0 0    
Accrued interest payable 0 0    
Subordinated debt 0 0    
Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Certificates of deposit with other banks 14,370 14,695    
Securities available-for-sale, at fair value 187,390      
Securities available-for-sale, including equity and other   206,091    
Equity securities 0      
Loans held for sale 63,706 66,794    
Loans, net 0 0    
Mortgage servicing rights 0 0    
Accrued interest receivable 1,767 1,241    
Deposits 1,317,934 1,126,615    
Repurchase agreements 15,755 22,403    
Accrued interest payable 911 643    
Subordinated debt 19,304 35,117    
Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Certificates of deposit with other banks 0 0    
Securities available-for-sale, at fair value 29,324      
Securities available-for-sale, including equity and other   23,809    
Equity securities 3,572      
Loans held for sale 0 0    
Loans, net 1,273,339 1,093,824    
Mortgage servicing rights 175 182    
Accrued interest receivable 4,418 4,055    
Deposits 0 0    
Repurchase agreements 0 0    
Accrued interest payable 0 0    
Subordinated debt 0 0    
Interest rate lock commitment | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,672 1,426    
Interest rate lock commitment | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,672 1,426    
Interest rate lock commitment | Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Interest rate lock commitment | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Interest rate lock commitment | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 1,672 1,426    
Interest rate swap | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 387 268    
Derivative liability 387 268    
Interest rate swap | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 387 268    
Derivative liability 387 268    
Interest rate swap | Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Derivative liability 0 0    
Interest rate swap | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 387 268    
Derivative liability 387 268    
Interest rate swap | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Derivative liability 0 0    
Interest rate cap | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 63 33    
Interest rate cap | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 63 33    
Interest rate cap | Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Interest rate cap | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 63 33    
Interest rate cap | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative asset 0 0    
Forward contracts | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 122,000 152,169    
Forward contracts | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 122,017 152,190    
Forward contracts | Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 0 0    
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 122,017 152,190    
Forward contracts | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
FHLB and other borrowings 0 0    
Mortgage-backed security hedges | Carrying Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liability 470 78    
Mortgage-backed security hedges | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liability 470 78    
Mortgage-backed security hedges | Quoted Prices in Active Markets for Identical Assets (Level I) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liability 0 0    
Mortgage-backed security hedges | Significant Other Observable Inputs (Level II) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liability 470 78    
Mortgage-backed security hedges | Significant Unobservable Inputs (Level III) | Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative liability $ 0 $ 0