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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses $ 0 $ 176,000 $ 47,000 $ 607,000  
Available For Sale Securities Pledged as Collateral, Amortized Cost Basis 83,900,000   83,900,000   $ 120,700,000
Available-for-sale Securities Pledged as Collateral, Fair Value 86,800,000   86,800,000   124,400,000
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 381,228,581   381,228,581   420,876,924
Available-for-sale Securities, Gross Unrealized Gains     8,197,754   10,228,827
Available-for-sale Securities, Gross Unrealized Losses     1,074,104   1,405,211
Available-for-sale Securities, Fair Value Disclosure 388,352,231   388,352,231   429,700,540
Proceeds From Sale of Available For Sale Securities Including Mortgage Backed Securities 4,000,000 27,300,000 58,200,000 54,600,000  
Investments [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Gains 8,000 $ 319,000 1,700,000 $ 795,000  
FHLB Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 5,113,509   5,113,509   13,317,462
Available-for-sale Securities, Gross Unrealized Gains     4,254   83,691
Available-for-sale Securities, Gross Unrealized Losses     56,284   154,492
Available-for-sale Securities, Fair Value Disclosure         13,246,661
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   2,000,000   5,750,000
Available-for-sale Securities, Gross Unrealized Gains     0   0
Available-for-sale Securities, Gross Unrealized Losses     10,138   82,006
Available-for-sale Securities, Fair Value Disclosure 1,989,862   1,989,862   5,667,994
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 997,380   997,380   996,822
Available-for-sale Securities, Gross Unrealized Gains     17,281   7,559
Available-for-sale Securities, Gross Unrealized Losses     0   0
Available-for-sale Securities, Fair Value Disclosure 1,014,661   1,014,661   1,004,381
SBA Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 111,586,926   111,586,926   106,637,400
Available-for-sale Securities, Gross Unrealized Gains     1,674,338   1,796,943
Available-for-sale Securities, Gross Unrealized Losses     135,029   307,649
Available-for-sale Securities, Fair Value Disclosure         108,126,694
Tax Exempt Municipal Bonds          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 79,370,686   79,370,686   59,960,960
Available-for-sale Securities, Gross Unrealized Gains     1,897,885   2,579,543
Available-for-sale Securities, Gross Unrealized Losses     737,204   45,080
Available-for-sale Securities, Fair Value Disclosure         62,495,423
Mortgage-Backed Securities          
Schedule of Available-for-sale Securities [Line Items]          
Amortized Cost of Investment And Mortgage-Backed Securities Available For Sale 181,909,642   181,909,642   233,963,842
Available-for-sale Securities, Gross Unrealized Gains     4,563,834   5,704,855
Available-for-sale Securities, Gross Unrealized Losses     135,449   815,984
Available-for-sale Securities, Fair Value Disclosure         238,852,713
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     40,162   56,236
Available-for-sale Securities, Gross Unrealized Losses     $ 0   0
Available-for-sale Securities, Fair Value Disclosure         $ 306,674