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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 76,000,000   76,000,000   $ 81,000,000
Available-for-sale Securities Pledged as Collateral, Fair Value 78,700,000   78,700,000   83,200,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 375,048,343   375,048,343   369,140,098
Available-for-sale Securities, Gross Unrealized Gains     13,353,242   7,532,926
Available-for-sale Securities, Gross Unrealized Losses     447,973   1,159,154
Available-for-sale Securities, Fair Value Disclosure 387,953,612   387,953,612   375,513,870
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities 11,400,000 $ 17,900,000 14,600,000 54,200,000  
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 79,348,443   79,348,443   73,499,636
Available-for-sale Securities, Gross Unrealized Gains     6,609,439   2,770,115
Available-for-sale Securities, Gross Unrealized Losses     0   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 16,600,000   16,600,000   3,800,000
Available-for-sale Securities, Fair Value Disclosure 16,300,000   16,300,000    
Investments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Gains 154,000 $ 182,000 412,000 $ 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 997,940   997,940   997,564
Available-for-sale Securities, Gross Unrealized Gains     25,974   6,767
Available-for-sale Securities, Gross Unrealized Losses     0   0
Available-for-sale Securities, Fair Value Disclosure 1,023,914   1,023,914   1,004,331
SBA Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 99,488,051   99,488,051   110,195,113
Available-for-sale Securities, Gross Unrealized Gains     1,525,658   1,415,464
Available-for-sale Securities, Gross Unrealized Losses     128,028   193,795
Mortgage-Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 193,948,106   193,948,106   180,197,347
Available-for-sale Securities, Gross Unrealized Gains     5,103,368   3,281,116
Available-for-sale Securities, Gross Unrealized Losses     319,945   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     59,908   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 1,015,365   1,015,365    
Available-for-sale Securities, Gross Unrealized Gains     28,895    
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 85,957,882   85,957,882   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 100,885,681   100,885,681   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 198,731,529   198,731,529   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 310,346   310,346   $ 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 $ 1,044,260   $ 1,044,260