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Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Available for Sale Securities) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Gross Realized Losses $ 67,000        
Available For Sale Securities Pledged as Collateral, Amortized Cost Basis 112,800,000   $ 112,800,000   $ 99,200,000
Pledged Assets Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment 112,600,000   112,600,000   100,500,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 363,600,602   363,600,602   380,374,568
Available-for-sale Securities, Gross Unrealized Gains     2,708,220   5,840,528
Available-for-sale Securities, Gross Unrealized Losses     3,358,883   1,241,190
Available-for-sale Securities, Fair Value Disclosure 362,949,939   362,949,939   384,973,906
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities 28,600,000     $ 17,500,000  
US States and Political Subdivisions Debt Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 60,477,526   60,477,526   59,623,185
Available-for-sale Securities, Gross Unrealized Gains     1,311,392   2,789,233
Available-for-sale Securities, Gross Unrealized Losses     402,930   56,851
Mortgage-backed Securities, Issued by Private Enterprises [Member]          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 30,000,000   30,000,000   26,900,000
Available-for-sale Securities, Fair Value Disclosure 29,900,000   29,900,000    
Investments [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Gross Realized Gains 503,000 $ 629,000 7,029 $ 1,288  
SBA Bonds          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 115,797,449   115,797,449   123,324,802
Available-for-sale Securities, Gross Unrealized Gains     372,414   1,113,160
Available-for-sale Securities, Gross Unrealized Losses     724,834   189,518
Mortgage-Backed Securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 172,137,551   172,137,551   186,732,705
Available-for-sale Securities, Gross Unrealized Gains     1,017,385   1,936,847
Available-for-sale Securities, Gross Unrealized Losses     2,076,428   973,572
Equity Securities          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 155,000   155,000   155,000
Available-for-sale Securities, Gross Unrealized Gains     0   0
Available-for-sale Securities, Gross Unrealized Losses     0   0
Taxable Municipal Bonds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 2,014,601   2,014,601   2,016,833
Available-for-sale Securities, Gross Unrealized Gains     0   0
Available-for-sale Securities, Gross Unrealized Losses     45,931   19,703
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 61,385,988   61,385,988   62,355,567
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 115,445,029   115,445,029   124,248,444
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 171,078,508   171,078,508   187,695,980
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 155,000   155,000   155,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Fair Value Disclosure $ 1,968,670   $ 1,968,670   $ 1,997,130