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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses $ 0   $ 0    
Available For Sale Securities Pledged as Collateral, Amortized Cost Basis 92,100,000   92,100,000   $ 75,300,000
Available-for-sale Securities Pledged as Collateral, Fair Value 93,900,000   93,900,000   76,900,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 395,298,490   395,298,490   360,457,164
Available-for-sale Securities, Gross Unrealized Gains     7,153,999   4,788,292
Available-for-sale Securities, Gross Unrealized Losses     1,102,625   3,186,027
Available-for-sale Securities, Fair Value Disclosure 401,349,864   401,349,864   362,059,429
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities 2,200,000 $ 11,400,000 17,500,000 $ 14,600,000  
US States and Political Subdivisions Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 81,369,078   81,369,078   72,248,915
Available-for-sale Securities, Gross Unrealized Gains     3,217,508   1,185,753
Available-for-sale Securities, Gross Unrealized Losses     538,589   1,899,519
Mortgage-backed Securities, Issued by Private Enterprises [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 29,700,000   29,700,000   20,000,000
Available-for-sale Securities, Fair Value Disclosure 29,700,000   29,700,000   19,700,000
Investments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Gains 45,000 $ 154,000 629,000 $ 412,000  
FHLB Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale         998,001
Available-for-sale Securities, Gross Unrealized Gains         0
Available-for-sale Securities, Gross Unrealized Losses         1
SBA Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 126,753,533   126,753,533   101,280,921
Available-for-sale Securities, Gross Unrealized Gains     1,197,692   909,361
Available-for-sale Securities, Gross Unrealized Losses     161,805   284,223
Mortgage-Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 184,945,040   184,945,040   183,657,697
Available-for-sale Securities, Gross Unrealized Gains     2,729,888   2,575,616
Available-for-sale Securities, Gross Unrealized Losses     402,231   972,222
Equity Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 155,000   155,000   250,438
Available-for-sale Securities, Gross Unrealized Gains     0   117,562
Available-for-sale Securities, Gross Unrealized Losses     0   0
Taxable Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 2,019,039   2,019,039   2,021,192
Available-for-sale Securities, Gross Unrealized Gains     8,911   0
Available-for-sale Securities, Gross Unrealized Losses     0   30,062
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 84,047,997   84,047,997   71,535,149
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | FHLB Securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure         998,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 127,789,420   127,789,420   101,906,059
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 187,272,697   187,272,697   185,261,091
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure 155,000   155,000   368,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Taxable Municipal Bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Fair Value Disclosure $ 2,027,950   $ 2,027,950   $ 1,991,130