Loans and Allowance for Loan Losses, Part II (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum Balance Of Loans For Which Credit Quality Analysis Is Performed	$ 100,000
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	1,511,000		2,737,000
60 to 89 Days Past Due	1,338,000		1,303,000
90 Days or More Past Due	582,000		2,204,000
Total Past Due	3,431,000		6,244,000
Current	979,373,000		904,821,000
Total Loans Receivable	982,804,000		911,065,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Number of days past due when interest is not accrued	ninety days
Period of satisfactory performance before returning to accrual status	six months
Loans with a specific allowance [Abstract]
Recorded Balance	1,985,000		2,060,000
Unpaid Principal Balance	1,985,000		2,562,000
Specific Allowance	604,000		511,000
Loans without a specific allowance [Abstract]
Recorded Balance	4,484,000		5,533,000
Unpaid Principal Balance	6,173,000		6,794,000
Total Loans [Abstract]
Recorded Balance	6,469,000		7,593,000
Unpaid Principal Balance	8,158,000		9,356,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	7,118,000		7,871,000		7,698,000
Interest income recognized	31,000		22,000		36,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	6,121,000		7,573,000
Interest Lost on Nonaccrual Loans	45,000,000		173,000,000		239,000,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	3,200,000		3,339,000
Troubled Debt Restructuring, Allowance	431,000		295,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	3,200,000		3,339,000
Financing Receivable Modifications Performing Recorded Investment	348,000		20,000
Financing Receivables, Modifications during Period, Balance	799,000		2,135,000
Financing Receivables, Modifications during Period, Number	13		12
Subsequent Default, Number of Days Past Due	90 days
Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	944,340,000		865,059,000
Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	22,574,000		31,994,000
Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	15,890,000		14,012,000
Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Construction and land development
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	0		0
60 to 89 Days Past Due	0		53,000
90 Days or More Past Due	0		0
Total Past Due	0		53,000
Current	25,321,000		31,288,000
Total Loans Receivable	25,321,000		31,341,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	614,000		1,114,000
Unpaid Principal Balance	614,000		1,529,000
Specific Allowance	76,000		295,000
Loans without a specific allowance [Abstract]
Recorded Balance	869,000		408,000
Unpaid Principal Balance	1,727,000		694,000
Total Loans [Abstract]
Recorded Balance	1,483,000		1,522,000
Unpaid Principal Balance	2,341,000		2,223,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	1,565,000		1,520,000		841,000
Interest income recognized	0		0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	1,483,000		1,522,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	1,482,000		1,522,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	1,482,000		1,522,000
Financing Receivables, Modifications during Period, Balance	284,000		1,553,000
Financing Receivables, Modifications during Period, Number	1	[1]	4	[1]
Construction and land development | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	23,839,000		27,217,000
Construction and land development | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		2,135,000
Construction and land development | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,482,000		1,989,000
Construction and land development | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Farm loans
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	299,000		592,000
60 to 89 Days Past Due	0		0
90 Days or More Past Due	0		293,000
Total Past Due	299,000		885,000
Current	109,106,000		85,386,000
Total Loans Receivable	109,405,000		86,271,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Specific Allowance	0		0
Loans without a specific allowance [Abstract]
Recorded Balance	105,000		418,000
Unpaid Principal Balance	113,000		429,000
Total Loans [Abstract]
Recorded Balance	105,000		418,000
Unpaid Principal Balance	113,000		429,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	107,000		421,000		532,000
Interest income recognized	0		0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	105,000		418,000
Farm loans | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	108,262,000		82,516,000
Farm loans | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	231,000		2,662,000
Farm loans | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	912,000		1,093,000
Farm loans | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	326,000		1,351,000
60 to 89 Days Past Due	146,000		40,000
90 Days or More Past Due	371,000		944,000
Total Past Due	843,000		2,335,000
Current	183,918,000		184,163,000
Total Loans Receivable	184,761,000		186,498,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		636,000
Unpaid Principal Balance	0		723,000
Specific Allowance	0		162,000
Loans without a specific allowance [Abstract]
Recorded Balance	1,110,000		1,269,000
Unpaid Principal Balance	1,558,000		1,792,000
Total Loans [Abstract]
Recorded Balance	1,110,000		1,905,000
Unpaid Principal Balance	1,558,000		2,515,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	1,248,000		1,948,000		1,755,000
Interest income recognized	5,000		7,000		0
Loans Receivable, Modifications, Still Accruing Interest	101,000		6,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	1,009,000		1,899,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	306,000		445,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	306,000		445,000
Financing Receivable Modifications Performing Recorded Investment	101,000		6,000
Financing Receivables, Modifications during Period, Balance	251,000		94,000
Financing Receivables, Modifications during Period, Number	5	[1]	2	[1]
1-4 Family residential properties | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	182,593,000		183,880,000
1-4 Family residential properties | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	637,000		424,000
1-4 Family residential properties | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,531,000		2,194,000
1-4 Family residential properties | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	0		0
60 to 89 Days Past Due	0		0
90 Days or More Past Due	0		0
Total Past Due	0		0
Current	50,174,000		44,863,000
Total Loans Receivable	50,174,000		44,863,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Specific Allowance	0		0
Loans without a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Total Loans [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	0		0		0
Interest income recognized	0		0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	0		0
Multifamily residential properties | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	50,174,000		44,863,000
Multifamily residential properties | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Multifamily residential properties | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Multifamily residential properties | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Commercial real estate
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	568,000		262,000
60 to 89 Days Past Due	1,030,000		911,000
90 Days or More Past Due	145,000		255,000
Total Past Due	1,743,000		1,428,000
Current	355,256,000		314,894,000
Total Loans Receivable	356,999,000		316,322,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	1,096,000		0
Unpaid Principal Balance	1,096,000		0
Specific Allowance	301,000		0
Loans without a specific allowance [Abstract]
Recorded Balance	1,750,000		2,063,000
Unpaid Principal Balance	1,778,000		2,253,000
Total Loans [Abstract]
Recorded Balance	2,846,000		2,063,000
Unpaid Principal Balance	2,874,000		2,253,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	2,895,000		2,100,000		2,688,000
Interest income recognized	3,000		0		22,000
Loans Receivable, Modifications, Still Accruing Interest	39,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	2,807,000		2,063,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	899,000		950,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	899,000		950,000
Financing Receivable Modifications Performing Recorded Investment	39,000		0
Financing Receivables, Modifications during Period, Balance	39,000		289,000
Financing Receivables, Modifications during Period, Number	1	[1]	1	[1]
Commercial real estate | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	335,284,000		287,794,000
Commercial real estate | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	17,998,000		24,213,000
Commercial real estate | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,717,000		4,315,000
Commercial real estate | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	1,193,000		2,205,000
60 to 89 Days Past Due	1,176,000		1,004,000
90 Days or More Past Due	516,000		1,492,000
Total Past Due	2,885,000		4,701,000
Current	723,775,000		660,594,000
Total Loans Receivable	726,660,000		665,295,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	1,710,000		1,750,000
Unpaid Principal Balance	1,710,000		2,252,000
Specific Allowance	377,000		457,000
Loans without a specific allowance [Abstract]
Recorded Balance	3,834,000		4,158,000
Unpaid Principal Balance	5,176,000		5,168,000
Total Loans [Abstract]
Recorded Balance	5,544,000		5,908,000
Unpaid Principal Balance	6,886,000		7,420,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	5,815,000		5,989,000		5,816,000
Interest income recognized	8,000		7,000		22,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	5,404,000		5,902,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	2,687,000		2,917,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	2,687,000		2,917,000
Financing Receivable Modifications Performing Recorded Investment	140,000		6,000
Financing Receivables, Modifications during Period, Balance	574,000		1,936,000
Financing Receivables, Modifications during Period, Number	7		7
Agricultural loans
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	122,000		0
60 to 89 Days Past Due	49,000		0
90 Days or More Past Due	0		620,000
Total Past Due	171,000		620,000
Current	63,957,000		60,394,000
Total Loans Receivable	64,128,000		61,014,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		310,000
Unpaid Principal Balance	0		310,000
Specific Allowance	0		54,000
Loans without a specific allowance [Abstract]
Recorded Balance	0		620,000
Unpaid Principal Balance	0		1,568,000
Total Loans [Abstract]
Recorded Balance	0		930,000
Unpaid Principal Balance	0		1,878,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	16,000		1,071,000		673,000
Interest income recognized	1,000		0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	0		930,000
Agricultural loans | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	62,439,000		56,899,000
Agricultural loans | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	193,000		958,000
Agricultural loans | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,496,000		3,157,000
Agricultural loans | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	113,000		413,000
60 to 89 Days Past Due	88,000		275,000
90 Days or More Past Due	62,000		53,000
Total Past Due	263,000		741,000
Current	168,090,000		159,558,000
Total Loans Receivable	168,353,000		160,299,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	275,000		0
Unpaid Principal Balance	275,000		0
Specific Allowance	227,000		0
Loans without a specific allowance [Abstract]
Recorded Balance	613,000		704,000
Unpaid Principal Balance	946,000		0
Total Loans [Abstract]
Recorded Balance	888,000		704,000
Unpaid Principal Balance	1,221,000		0
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	1,240,000		755,000		1,199,000
Interest income recognized	10,000		0		14,000
Loans Receivable, Modifications, Still Accruing Interest	182,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	706,000		704,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	487,000		408,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	487,000		408,000
Financing Receivable Modifications Performing Recorded Investment	182,000		0
Financing Receivables, Modifications during Period, Balance	211,000		185,000
Financing Receivables, Modifications during Period, Number	2	[1]	4	[1]
Commercial and industrial loans | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	158,107,000		157,461,000
Commercial and industrial loans | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	3,515,000		1,588,000
Commercial and industrial loans | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	6,731,000		1,250,000
Commercial and industrial loans | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
Consumer loans
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	83,000		119,000
60 to 89 Days Past Due	25,000		24,000
90 Days or More Past Due	4,000		39,000
Total Past Due	112,000		182,000
Current	14,467,000		16,082,000
Total Loans Receivable	14,579,000		16,264,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Specific Allowance	0		0
Loans without a specific allowance [Abstract]
Recorded Balance	37,000		51,000
Unpaid Principal Balance	51,000		58,000
Total Loans [Abstract]
Recorded Balance	37,000		51,000
Unpaid Principal Balance	51,000		58,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	47,000		56,000		10,000
Interest income recognized	12,000		15,000		0
Loans Receivable, Modifications, Still Accruing Interest	26,000		14,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	11,000		37,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	26,000		14,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Troubled Debt Restructurings Balance	26,000		14,000
Financing Receivable Modifications Performing Recorded Investment	26,000		14,000
Financing Receivables, Modifications during Period, Balance	14,000		14,000
Financing Receivables, Modifications during Period, Number	4	[1]	1	[1]
Consumer loans | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	14,558,000		16,236,000
Consumer loans | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		14,000
Consumer loans | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	21,000		14,000
Consumer loans | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
All other loans
Loans Receivable Aging Analysis [Abstract]
30 to 59 Days Past Due	0		0
60 to 89 Days Past Due	0		0
90 Days or More Past Due	0		0
Total Past Due	0		0
Current	9,084,000		8,193,000
Total Loans Receivable	9,084,000		8,193,000
Total Loans Greater than 90 Days Past Due and Still Accruing	0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Specific Allowance	0		0
Loans without a specific allowance [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Total Loans [Abstract]
Recorded Balance	0		0
Unpaid Principal Balance	0		0
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	0		0		0
Interest income recognized	0		0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	0		0
All other loans | Pass [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	9,084,000		8,193,000
All other loans | Watch [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
All other loans | Substandard [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0
All other loans | Doubtful [Member]
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	$ 0		$ 0

[1] Type of modifications:(a) Reduction of stated interest rate of loan(b) Change in payment terms(c) Extension of maturity date(d) Permanent reduction of the recorded investment