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Loans and Allowance - Total Allowance by Loan Segment (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Provision for credit losses $ 410 $ 985 $ 150 $ 150 $ 746 $ 125 $ 112 $ 38 $ 260 $ 1,695,000 $ 1,020,876 $ 260,000
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 1,103,686                       1,103,686    
Loans Receivable                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       3,117,870       2,972,019       $ 3,307,920 3,117,870 2,972,019 3,307,920
Provision for credit losses                         1,695,000 1,020,876 260,000
Recoveries                         512,117 471,330 437,502
Loans charged off                         (2,174,736) (1,346,355) (1,033,403)
Balance, end of year 3,150,251       3,117,870       2,972,019       3,150,251 3,117,870 2,972,019
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 1,103,686       1,270,159       1,163,567       1,103,686 1,270,159 1,163,567
Individually evaluated for impairment, Related loan balance 5,126,778       6,445,676       5,908,796       5,126,778 6,445,676 5,908,796
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance 2,046,565       1,847,711       1,808,452       2,046,565 1,847,711 1,808,452
Collectively evaluated for impairment, Balance in allowance 258,730,913       271,784,827       268,918,682       258,730,913 271,784,827 268,918,682
Loans Receivable | Commercial and Industrial                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       385,631       412,909       541,916 385,631 412,909 541,916
Provision for credit losses                         (78,901) (4,580) 46,303
Recoveries                         1,400 6,440 26,804
Loans charged off                         (2,807) (29,138) (202,114)
Balance, end of year 305,323       385,631       412,909       305,323 385,631 412,909
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 240,500       252,500       278,786       240,500 252,500 278,786
Individually evaluated for impairment, Related loan balance 240,500       252,500       278,786       240,500 252,500 278,786
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance 64,823       133,131       134,123       64,823 133,131 134,123
Collectively evaluated for impairment, Balance in allowance 4,299,201       3,266,252       3,893,961       4,299,201 3,266,252 3,893,961
Loans Receivable | Commercial Real Estate                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       335,009       898,362       1,183,240 335,009 898,362 1,183,240
Provision for credit losses                         (23,814) (448,027) (374,067)
Recoveries                         13,468 128,068 $ 89,189
Loans charged off                         (63,000) (243,394)
Balance, end of year 261,663       335,009       898,362       261,663 335,009 $ 898,362
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 100,745       148,791       550,794       100,745 148,791 550,794
Individually evaluated for impairment, Related loan balance 1,143,317       2,155,816       3,364,193       1,143,317 2,155,816 3,364,193
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance 160,918       186,218       347,568       160,918 186,218 347,568
Collectively evaluated for impairment, Balance in allowance 63,128,304       63,486,816       65,414,415       63,128,304 63,486,816 65,414,415
Loans Receivable | Consumer and Indirect                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       1,281,222       1,187,604       1,057,531 1,281,222 1,187,604 1,057,531
Provision for credit losses                         296,437 601,522 468,559
Recoveries                         486,776 331,108 313,795
Loans charged off                         (1,260,533) (839,012) (652,281)
Balance, end of year 803,902       1,281,222       1,187,604       803,902 1,281,222 1,187,604
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 65,353       186,226       178,657       65,353 186,226 178,657
Individually evaluated for impairment, Related loan balance 950,722       1,106,217       636,174       950,722 1,106,217 636,174
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance 738,549       1,094,996       1,008,947       738,549 1,094,996 1,008,947
Collectively evaluated for impairment, Balance in allowance 74,352,049       82,996,925       72,594,259       74,352,049 82,996,925 72,594,259
Loans Receivable | Residential Real Estate                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       1,169,627       593,463       392,506 1,169,627 593,463 392,506
Provision for credit losses                         1,299,194 805,261 372,251
Recoveries                         10,473 5,714 7,714
Loans charged off                         (848,396) (234,811) (179,008)
Balance, end of year 1,630,898       1,169,627       593,463       1,630,898 1,169,627 593,463
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance 697,088       682,642       155,330       697,088 682,642 155,330
Individually evaluated for impairment, Related loan balance 2,792,239       2,931,143       1,629,643       2,792,239 2,931,143 1,629,643
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance 933,810       486,985       438,133       933,810 486,985 438,133
Collectively evaluated for impairment, Balance in allowance 116,951,359       122,034,834       127,016,047       116,951,359 122,034,834 127,016,047
Loans Receivable | Unallocated                              
Financing Receivable, Allowance for Credit Losses [Roll Forward]                              
Balance, beginning of year       $ (53,619)       $ (120,319)       $ 132,727 (53,619) (120,319) 132,727
Provision for credit losses                         $ 202,084 $ 66,700 $ (253,046)
Recoveries                        
Loans charged off                        
Balance, end of year $ 148,465       $ (53,619)       $ (120,319)       $ 148,465 $ (53,619) $ (120,319)
Individually evaluated for impairment:                              
Individually evaluated for impairment, Balance in allowance                  
Individually evaluated for impairment, Related loan balance                  
Collectively evaluated for impairment:                              
Collectively evaluated for impairment, Balance in allowance $ 148,465       $ (53,619)       $ (120,319)       $ 148,465 $ (53,619) $ (120,319)
Collectively evaluated for impairment, Balance in allowance