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Loans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Loan
loan
Dec. 31, 2018
USD ($)
Loan
loan
Dec. 31, 2019
Loan
Dec. 31, 2019
Dec. 31, 2019
loan
Sep. 30, 2019
USD ($)
Dec. 31, 2018
Loan
Dec. 31, 2018
Dec. 31, 2018
Customer
Dec. 31, 2018
loan
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Allowance for loan loss $ 10,942,000 $ 10,976,000                  
Loans and leases receivable, allowance percentage       (0.75%)       (0.81%)      
Net deferred loan fee and premiums 1,900,000 1,200,000                  
Deferred loan fee paid by customers 3,300,000 3,100,000                  
Total deferred loan fee and premiums 5,200,000 4,300,000                  
Percentage status of loan in portfolio       100.00%       100.00%      
Total Loan Receivables 1,454,172,000 1,346,922,000                  
Loans sold for payment, service rights retain, percent of outstanding balance       0.25%              
Increase in non accrual loans (1,400,000)                    
Total Non-accrual Loans 17,857,000 19,282,000                  
Total number of loans     39   39   38     38  
Non-accrual Current Loans $ 5,070,000 8,130,000                  
Percentage of current loans on total non accrual loans 28.00%                    
Non- accrual Delinquent Loans $ 12,787,000 $ 11,152,000                  
Percentage of delinquent loans on total non accrual loans 72.00%                    
Reserve for delinquent non accrual loans $ 522,000                    
Number of TDR loans | Loan 8 13                  
Increase in financial receivables past due $ 1,100,000                    
Past due 13,327,000 $ 12,244,000                  
Financing receivable post modification recorded investment $ 2,049,000 $ 6,705,000                  
Number of loans added to troubled debt restructuring | Loan 1 0                  
Amount of loans added to troubled debt restructuring $ 25,000                    
Accrual TDR loans $ 650,000 $ 6,676,000                  
Performance TDR percentage 31.70% 99.60%                  
Unpaid Contractual Principal Balance $ 28,235,000 $ 37,208,000                  
Total recorded investment $ 27,986,000 $ 36,880,000                  
Performance TDR interest rate 4.51% 5.08%                  
Loan participations, loans sold, amount $ 14,900,000 $ 24,600,000                  
Loan participations, loans purchased, amount $ 3,400,000 11,900,000                  
Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loan security percentage 80.00%                    
Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       66.34%       65.18%      
Loan security percentage 80.00%                    
Total Loan Receivables $ 964,777,000 878,016,000                  
Total Non-accrual Loans 12,249,000 14,632,000                  
Total number of loans | Loan     16       17        
Non-accrual Current Loans 1,687,000 6,158,000                  
Non- accrual Delinquent Loans $ 10,562,000 $ 8,474,000                  
Number of TDR loans | Loan 3 7                  
Past due $ 10,780,000 $ 9,151,000                  
Financing receivable post modification recorded investment 1,420,000 5,612,000                  
Unpaid Contractual Principal Balance 20,914,000 27,835,000                  
Total recorded investment 20,707,000 27,540,000                  
Commercial Real Estate Portfolio Segment [Member] | Commercial Construction Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       8.90%       5.90%      
Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       11.53%       11.63%      
Increase (decrease) in finance receivables 41,000,000 11,000,000                  
Total Loan Receivables 167,710,000 156,709,000                  
Total Non-accrual Loans 830,000 1,374,000                  
Total number of loans | Loan     3       5        
Non-accrual Current Loans 830,000 1,228,000                  
Non- accrual Delinquent Loans $ 0 $ 146,000                  
Number of TDR loans | Loan 1 1                  
Past due $ 0 $ 212,000                  
Financing receivable post modification recorded investment 64,000 66,000                  
Unpaid Contractual Principal Balance 1,921,000 2,527,000                  
Total recorded investment 1,917,000 2,527,000                  
Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       8.50%       9.23%      
Total Loan Receivables 123,601,000 124,298,000                  
Total Non-accrual Loans 937,000 963,000                  
Total number of loans | Loan     5       5        
Non-accrual Current Loans 937,000 703,000                  
Non- accrual Delinquent Loans $ 0 $ 260,000                  
Number of TDR loans | Loan 0 1                  
Past due $ 0 $ 313,000                  
Financing receivable post modification recorded investment 0 216,000                  
Unpaid Contractual Principal Balance 941,000 1,745,000                  
Total recorded investment 937,000 1,745,000                  
Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       2.35%   2.40%   2.21%      
Total Loan Receivables $ 34,133,000 $ 29,705,000       $ 34,100,000          
Number of TDR loans | Loan 0 2                  
Past due $ 0 $ 0                  
Financing receivable post modification recorded investment 0 729,000                  
Unpaid Contractual Principal Balance 0 729,000                  
Total recorded investment 0 729,000                  
Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       2.48%   2.50%   2.64%      
Total Loan Receivables 36,098,000 35,561,000       $ 36,100,000          
Total Non-accrual Loans 448,000 147,000                  
Total number of loans | Loan     6       2        
Non-accrual Current Loans 271,000 0                  
Non- accrual Delinquent Loans 177,000 147,000                  
Past due 298,000 413,000                  
Unpaid Contractual Principal Balance 524,000 294,000                  
Total recorded investment 510,000 288,000                  
Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       4.34%   4.30%   5.32%     4.91%
Total Loan Receivables 63,102,000 71,680,000       $ 63,100,000          
Total Non-accrual Loans 3,127,000 866,000                  
Total number of loans | Loan     3       2        
Non-accrual Current Loans 1,320,000                    
Non- accrual Delinquent Loans $ 1,807,000 $ 866,000                  
Number of TDR loans | Loan 0 1                  
Past due $ 1,807,000 $ 866,000                  
Financing receivable post modification recorded investment 0 53,000                  
Unpaid Contractual Principal Balance 3,127,000 2,762,000                  
Total recorded investment 3,127,000 2,751,000                  
Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       0.08%       0.06%      
Total Loan Receivables 1,104,000 751,000                  
Past due 0 5,000                  
Unpaid Contractual Principal Balance 0 1,000                  
Total recorded investment 0 1,000                  
Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       4.38%       3.73%      
Total Loan Receivables 63,647,000 50,202,000                  
Total Non-accrual Loans 266,000 1,300,000                  
Total number of loans | Loan     6       7        
Non-accrual Current Loans 25,000 41,000                  
Non- accrual Delinquent Loans $ 241,000 $ 1,259,000                  
Number of TDR loans | Loan 4 1                  
Past due $ 442,000 $ 1,284,000                  
Financing receivable post modification recorded investment 565,000 29,000                  
Unpaid Contractual Principal Balance 808,000 1,315,000                  
Total recorded investment 788,000 1,299,000                  
Apartment Buildings Rentals [Member] | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 26,500,000 27,700,000                  
Adjustable Rate Residential Mortgage [Member] | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       7.00%       7.20%      
Total Loan Receivables 102,200,000 97,400,000                  
Adjustable Rate Residential First Mortgage [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       3.60%       4.00%      
Total Loan Receivables 52,300,000 54,200,000                  
Residential Mortgage Loans for Others [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Loans sold for payment, service rights retained, amount 32,900,000 38,100,000                  
One To Four Family Units [Member] | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 97,100,000 96,600,000                  
Eight Loans And Seven Customer Relationships [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Non-accrual Loans $ 15,000,000                    
Total number of loans | loan         18            
Percentage status of non accrual loans 84.00%                    
Thirteen Loans And Four Customer Relationships [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Non-accrual Loans   $ 15,300,000                  
Total number of loans | loan                   13  
Number of customer relationships | Customer                 4    
Percentage status of non accrual loans   79.00%                  
Financing Receivable Troubled Debt Restructuring [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
TDR loan principal curtailment   $ 176,000                  
Interest income recognized on outstanding TDR loans $ 92,000 348,000                  
One Troubled Debt Restructuring Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Non-accrual Loans $ 1,400,000 $ 29,000                  
Number of TDR loans | loan 3 1                  
Increase (decrease) in loans   $ 4,700,000                  
Financing receivable post modification recorded investment   1,600,000                  
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method   $ 165,000                  
Three Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Number of loans removed from troubled debt restructuring | loan 7                    
Three Troubled Debt Restructuring Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Financing receivable post modification recorded investment $ 88,000                    
Three Troubled Debt Restructuring Loans With Reserves [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Number of TDR loans | loan   3                  
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method 87,000                    
Seven Troubled Debt Restructuring Loans with Reserves [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Financing receivable post modification recorded investment 236,000                    
Amount of loans removed from troubled debt restructuring 4,400,000 $ 3,900,000                  
Nonaccrual Loans With No Impairment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       0.92%       0.91%      
Total Non-accrual Loans 11,700,000 17,400,000                  
Interest due to debt 318,000 456,000                  
Nonaccrual Loans With Impairment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Non-accrual Loans 1,200,000 1,876,000                  
Interest due to debt $ 302,000 81,000                  
Minimum | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 3 years                    
Minimum | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 3 years                    
Minimum | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 10 years                    
Minimum | Commercial Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Threshold limit $ 1,000,000                    
Maximum | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 20 years                    
Maximum | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 20 years                    
Maximum | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 30 years                    
Maximum | Commercial Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Debt maturity period 5 years                    
Unrated [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables $ 350,699,000 333,349,000                  
Unrated [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 102,695,000 112,280,000                  
Unrated [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 38,139,000 37,478,000                  
Unrated [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 2,075,000 2,172,000                  
Unrated [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 16,754,000 19,157,000                  
Unrated [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 26,045,000 15,373,000                  
Pass [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 1,076,610,000 981,347,000                  
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 840,403,000 741,037,000                  
Pass [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 84,811,000 85,551,000                  
Pass [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 32,058,000 26,805,000                  
Pass [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 43,221,000 49,828,000                  
Pass [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 37,399,000 33,685,000                  
Special Mention [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Special Mention [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Special Mention [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Special Mention [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Special Mention [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
Substandard [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 26,863,000 32,226,000                  
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 21,679,000 24,699,000                  
Substandard [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 651,000 1,269,000                  
Substandard [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 728,000                  
Substandard [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 3,127,000 2,695,000                  
Substandard [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 203,000 1,144,000                  
31 - 60 Days [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 150,000 305,000                  
31 - 60 Days [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
31 - 60 Days [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
31 - 60 Days [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 13,000                  
31 - 60 Days [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
31 - 60 Days [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 98,000 266,000                  
31 - 60 Days [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
31 - 60 Days [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 1,000                  
31 - 60 Days [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 52,000 25,000                  
61 - 89 Days [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 399,000 829,000                  
61 - 89 Days [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 217,000 677,000                  
61 - 89 Days [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 66,000                  
61 - 89 Days [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 53,000                  
61 - 89 Days [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
61 - 89 Days [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 23,000 0                  
61 - 89 Days [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
61 - 89 Days [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 4,000                  
61 - 89 Days [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 159,000 29,000                  
90 or Greater Days [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 12,778,000 11,110,000                  
90 or Greater Days [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 10,563,000 8,474,000                  
90 or Greater Days [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 146,000                  
90 or Greater Days [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 247,000                  
90 or Greater Days [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
90 or Greater Days [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 177,000 147,000                  
90 or Greater Days [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 1,807,000 866,000                  
90 or Greater Days [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 0 0                  
90 or Greater Days [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Past due 231,000 1,230,000                  
Performing Financial Instruments [Member] | Residential Rentals Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Largest outstanding loan, amount 9,700,000 10,000,000                  
Performing Financial Instruments [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 167,710,000 156,563,000                  
Largest outstanding loan, amount 3,000,000 2,100,000                  
Performing Financial Instruments [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 35,921,000 35,414,000                  
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Largest outstanding loan, amount 2,800,000 4,200,000                  
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 1,104,000 751,000                  
Performing Financial Instruments [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Largest outstanding loan, amount 2,100,000 2,500,000                  
Performing Financial Instruments [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Largest outstanding loan, amount 21,100,000 21,500,000                  
Performing Financial Instruments [Member] | One To Four Family Units [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Largest outstanding loan, amount 5,300,000 2,500,000                  
Nonperforming Financial Instruments [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       1.43%       1.23%      
Nonperforming Financial Instruments [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 146,000                  
Nonperforming Financial Instruments [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 177,000 147,000                  
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
PCI Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Reclassification from (to) nonaccretable difference 330,000 134,000                  
Percentage status of loan in portfolio       0.13%       0.19%      
Total Loan Receivables 2,424,000 3,220,000                  
Other changes, net (32,000) 313,000                  
Unpaid Contractual Principal Balance 2,900,000 3,900,000                  
Total recorded investment 2,400,000 3,200,000                  
PCI Loans [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 1,738,000 1,785,000                  
PCI Loans [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 466,000                  
PCI Loans [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 295,000 897,000                  
PCI Loans [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
PCI Loans [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 391,000 72,000                  
PCI Loans [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
PCI Loans [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
PCI Loans [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 0 0                  
All Other Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Allowance for loan loss 10,942,000 10,976,000                  
Total Loan Receivables 1,451,748,000 1,343,702,000                  
All Other Loans [Member] | Commercial Real Estate Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 963,039,000 876,231,000                  
All Other Loans [Member] | Residential First Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 167,710,000 156,243,000                  
All Other Loans [Member] | Residential Rentals Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 123,306,000 123,401,000                  
All Other Loans [Member] | Construction And Land Development Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 34,133,000 29,705,000                  
All Other Loans [Member] | Home Equity And Second Mortgages Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 35,707,000 35,489,000                  
All Other Loans [Member] | Commercial Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 63,102,000 71,680,000                  
All Other Loans [Member] | Consumer Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 1,104,000 751,000                  
All Other Loans [Member] | Commercial Equipment Portfolio Segment [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Total Loan Receivables 63,647,000 50,202,000                  
County First Acquisition [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       5.30%       7.94%      
Total Loan Receivables 77,078,000 106,887,000                  
County First Acquisition [Member] | PCI Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       0.17%       0.24%      
Total Loan Receivables 2,424,000 3,220,000                  
Fair value adjustment $ 516,000 $ 696,000                  
Percentage change on total loans 17.55% 17.77%                  
County First Acquisition [Member] | All Other Loans [Member]                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Percentage status of loan in portfolio       5.13%       7.70%      
Total Loan Receivables $ 74,654,000 $ 103,667,000                  
Fair value adjustment $ 6,100,000                    
Percentage change on total loans 1.55% 1.76%