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Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Available for Sale Securities) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses $ 0   $ 0 $ 47,000  
Available For Sale Securities Pledged as Collateral, Amortized Cost Basis 71,600,000   71,600,000   $ 81,000,000
Available-for-sale Securities Pledged as Collateral, Fair Value 74,100,000   74,100,000   83,200,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 370,462,887   370,462,887   369,140,098
Available-for-sale Securities, Gross Unrealized Gains     11,055,540   7,532,926
Available-for-sale Securities, Gross Unrealized Losses     548,120   1,159,154
Available-for-sale Securities, Fair Value Disclosure 380,970,307   380,970,307   375,513,870
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities 6,900,000 $ 4,000,000 21,500,000 58,200,000  
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 77,997,989   77,997,989   73,499,636
Available-for-sale Securities, Gross Unrealized Gains     5,073,181   2,770,115
Available-for-sale Securities, Gross Unrealized Losses     114,675   204,132
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 18,600,000   18,600,000   3,800,000
Available-for-sale Securities, Fair Value Disclosure 18,300,000   18,300,000    
Investments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Gains 360,000 $ 8,000 772,000 $ 1,700,000  
FHLB Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale         2,000,000
Available-for-sale Securities, Gross Unrealized Gains         0
Available-for-sale Securities, Gross Unrealized Losses         67,912
US Treasury and Government [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale         2,000,000
Available-for-sale Securities, Gross Unrealized Gains         0
Available-for-sale Securities, Gross Unrealized Losses         12,064
Available-for-sale Securities, Fair Value Disclosure         1,987,936
US Government-sponsored Enterprises Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 998,131   998,131   997,564
Available-for-sale Securities, Gross Unrealized Gains     19,550   6,767
Available-for-sale Securities, Gross Unrealized Losses     0   0
Available-for-sale Securities, Fair Value Disclosure 1,017,681   1,017,681   1,004,331
SBA Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 100,978,165   100,978,165   110,195,113
Available-for-sale Securities, Gross Unrealized Gains     1,343,672   1,415,464
Available-for-sale Securities, Gross Unrealized Losses     123,707   193,795
Mortgage-Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 189,223,545   189,223,545   180,197,347
Available-for-sale Securities, Gross Unrealized Gains     4,512,200   3,281,116
Available-for-sale Securities, Gross Unrealized Losses     309,738   681,251
Equity Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 250,438   250,438   250,438
Available-for-sale Securities, Gross Unrealized Gains     80,896   59,464
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 1,014,619   1,014,619    
Available-for-sale Securities, Gross Unrealized Gains     26,041    
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 82,956,495   82,956,495   76,065,619
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         1,932,088
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 102,198,130   102,198,130   111,416,782
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 193,426,007   193,426,007   182,797,212
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 331,334   331,334   $ 309,902
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 $ 1,040,660   $ 1,040,660