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Loans and Allowance - Total Allowance by Loan Segment (Details 1) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     $ 3,150,251       $ 3,117,870       $ 2,972,019 $ 3,150,251 $ 3,117,870 $ 2,972,019
Provision for credit losses $ 635,000 $ 116,000 117,000 $ 410,000 $ 985,000 $ 150,000 150,000 $ 746,000 $ 125,000 $ 112,000 38,000 868,342 1,695,000 1,020,876
Recoveries                       378,415 512,117 471,330
Loans charged off                       (1,913,143) (2,174,736) (1,346,355)
Balance, end of year 2,483,865     3,150,251       3,117,870       2,483,865 3,150,251 3,117,870
Individually evaluated for impairment:                            
Individually evaluated for impairment, Balance in allowance 529,513     1,103,686       1,270,159       529,513 1,103,686 1,270,159
Individually evaluated for impairment, Related loan balance 5,016,772     5,126,778       6,445,676       5,016,772 5,126,778 6,445,676
Collectively evaluated for impairment:                            
Collectively evaluated for impairment, Balance in allowance 1,954,352     2,046,565       1,847,711       1,954,352 2,046,565 1,847,711
Collectively evaluated for impairment, Balance in allowance 261,089,504     258,730,913       271,784,827       261,089,504 258,730,913 271,784,827
Commercial and Industrial                            
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     305,323       385,631       412,909 305,323 385,631 412,909
Provision for credit losses                       (29,619) (78,901) (4,580)
Recoveries                       8,615 1,400 6,440
Loans charged off                         (2,807) (29,138)
Balance, end of year 284,319     305,323       385,631       284,319 305,323 385,631
Individually evaluated for impairment:                            
Individually evaluated for impairment, Balance in allowance 228,500     240,500       252,500       228,500 240,500 252,500
Individually evaluated for impairment, Related loan balance 228,500     240,500       252,500       228,500 240,500 252,500
Collectively evaluated for impairment:                            
Collectively evaluated for impairment, Balance in allowance 55,819     64,823       133,131       55,819 64,823 133,131
Collectively evaluated for impairment, Balance in allowance 4,450,975     4,299,201       3,266,252       4,450,975 4,299,201 3,266,252
Commercial Real Estate                            
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     261,663       335,009       898,362 261,663 335,009 898,362
Provision for credit losses                       361,024 (23,814) (448,027)
Recoveries                         13,468 128,068
Loans charged off                       (363,822) (63,000) (243,394)
Balance, end of year 258,865     261,663       335,009       258,865 261,663 335,009
Individually evaluated for impairment:                            
Individually evaluated for impairment, Balance in allowance       100,745       148,791         100,745 148,791
Individually evaluated for impairment, Related loan balance 1,412,914     1,143,317       2,155,816       1,412,914 1,143,317 2,155,816
Collectively evaluated for impairment:                            
Collectively evaluated for impairment, Balance in allowance 258,865     160,918       186,218       258,865 160,918 186,218
Collectively evaluated for impairment, Balance in allowance 68,008,950     63,128,304       63,486,816       68,008,950 63,128,304 63,486,816
Consumer and Indirect                            
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     803,902       1,281,222       1,187,604 803,902 1,281,222 1,187,604
Provision for credit losses                       431,428 296,437 601,522
Recoveries                       335,464 486,776 331,108
Loans charged off                       (695,242) (1,260,533) (839,012)
Balance, end of year 875,552     803,902       1,281,222       875,552 803,902 1,281,222
Individually evaluated for impairment:                            
Individually evaluated for impairment, Balance in allowance 49,509     65,353       186,226       49,509 65,353 186,226
Individually evaluated for impairment, Related loan balance 503,460     950,722       1,106,217       503,460 950,722 1,106,217
Collectively evaluated for impairment:                            
Collectively evaluated for impairment, Balance in allowance 826,043     738,549       1,094,996       826,043 738,549 1,094,996
Collectively evaluated for impairment, Balance in allowance 83,077,591     74,352,049       82,996,925       83,077,591 74,352,049 82,996,925
Residential Real Estate                            
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     1,630,898       1,169,627       593,463 1,630,898 1,169,627 593,463
Provision for credit losses                       239,803 1,299,194 805,261
Recoveries                       34,336 10,473 5,714
Loans charged off                       (854,079) (848,396) (234,811)
Balance, end of year 1,050,958     1,630,898       1,169,627       1,050,958 1,630,898 1,169,627
Individually evaluated for impairment:                            
Individually evaluated for impairment, Balance in allowance 251,504     697,088       682,642       251,504 697,088 682,642
Individually evaluated for impairment, Related loan balance 2,871,898     2,792,239       2,931,143       2,871,898 2,792,239 2,931,143
Collectively evaluated for impairment:                            
Collectively evaluated for impairment, Balance in allowance 799,454     933,810       486,985       799,454 933,810 486,985
Collectively evaluated for impairment, Balance in allowance 105,551,988     116,951,359       122,034,834       105,551,988 116,951,359 122,034,834
Unallocated                            
Financing Receivable, Allowance for Credit Losses [Roll Forward]                            
Balance, beginning of year     $ 148,465       $ (53,619)       $ (120,319) 148,465 (53,619) (120,319)
Provision for credit losses                       (134,294) 202,084 66,700
Recoveries                      
Loans charged off                      
Balance, end of year 14,171     148,465       (53,619)       14,171 148,465 (53,619)
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 14,171     148,465       (53,619)       14,171 148,465 (53,619)
Collectively evaluated for impairment, Balance in allowance