Loans and Allowance for Loan Losses, Part II (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 30,274,000		$ 30,274,000		$ 28,037,000
Current	2,516,269,000		2,516,269,000		2,616,482,000
Total Loans Receivable	2,546,543,000	$ 2,376,683,000	2,546,543,000	$ 2,376,683,000	2,644,519,000
Total Loans 90 Days & Accruing	0		$ 0		0
Number of days past due when interest is not accrued			ninety days
Period of satisfactory performance before returning to accrual status			not less than six months
Loans with a specific allowance [Abstract]
Recorded Balance	23,698,000		$ 23,698,000		32,603,000
Unpaid Principal Balance	25,058,000		25,058,000		34,178,000
Specific Allowance	2,277,000		2,277,000		3,279,000
Loans without a specific allowance [Abstract]
Recorded Balance	7,907,000		7,907,000		15,385,000
Unpaid Principal Balance	9,160,000		9,160,000		17,126,000
Total Loans [Abstract]
Recorded Balance	31,605,000		31,605,000		47,988,000
Unpaid Principal Balance	34,218,000		34,218,000		51,304,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	41,558,000	25,105,000	42,823,000	25,361,000
Interest income recognized	150,000	25,000	291,000	36,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	22,994,000		22,994,000		27,298,000
Interest Lost on Nonaccrual Loans			1,335,000	$ 758,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	7,595,000		7,595,000		9,956,000
Financing Receivable Modifications Performing Recorded Investment	2,779,000		$ 2,779,000		2,451,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			8	1
Financing Receivables, Modifications during Period, Balance			$ 1,720,000	$ 161,000
Subsequent Default, Number of Days Past Due			90 days
Loans Receivable, Modifications, Allowance	834,000		$ 834,000		1,418,000
Real Estate Acquired Through Foreclosure	3,569,000		3,569,000		2,534,000
Mortgage Loans Secured By Real Estate In Foreclosure			2,063,000		425,000
Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,426,202,000		2,426,202,000		2,511,889,000
Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	50,711,000		50,711,000		58,716,000
Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	69,630,000		69,630,000		73,914,000
Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due	482,000		482,000		503,000
Current	56,587,000		56,587,000		50,116,000
Total Loans Receivable	57,069,000		57,069,000		50,619,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	270,000		270,000		2,559,000
Unpaid Principal Balance	270,000		270,000		2,559,000
Specific Allowance	0		0		14,000
Loans without a specific allowance [Abstract]
Recorded Balance	46,000		46,000		48,000
Unpaid Principal Balance	46,000		46,000		48,000
Total Loans [Abstract]
Recorded Balance	316,000		316,000		2,607,000
Unpaid Principal Balance	316,000		316,000		2,607,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	629,000	44,000	632,000	44,000
Interest income recognized	8,000	0	16,000	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	46,000		46,000		377,000
Construction and land development | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	56,274,000		56,274,000		49,794,000
Construction and land development | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	459,000		459,000		471,000
Construction and land development | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	336,000		336,000		354,000
Construction and land development | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Agricultural real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	252,000		252,000		804,000
Current	229,672,000		229,672,000		230,896,000
Total Loans Receivable	229,924,000		229,924,000		231,700,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	0		0		0
Unpaid Principal Balance	0		0		0
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	291,000		291,000		309,000
Unpaid Principal Balance	291,000		291,000		309,000
Total Loans [Abstract]
Recorded Balance	291,000		291,000		309,000
Unpaid Principal Balance	291,000		291,000		309,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	956,000	235,000	957,000	235,000
Interest income recognized	0	0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	291,000		291,000		309,000
Agricultural real estate | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	217,643,000		217,643,000		221,047,000
Agricultural real estate | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	10,481,000		10,481,000		7,805,000
Agricultural real estate | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,800,000		1,800,000		2,848,000
Agricultural real estate | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	11,235,000		11,235,000		10,478,000
Current	343,908,000		343,908,000		363,040,000
Total Loans Receivable	355,143,000		355,143,000		373,518,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	4,990,000		4,990,000		4,565,000
Unpaid Principal Balance	5,061,000		5,061,000		4,952,000
Specific Allowance	511,000		511,000		234,000
Loans without a specific allowance [Abstract]
Recorded Balance	3,893,000		3,893,000		3,680,000
Unpaid Principal Balance	4,108,000		4,108,000		4,769,000
Total Loans [Abstract]
Recorded Balance	8,883,000		8,883,000		8,245,000
Unpaid Principal Balance	9,169,000		9,169,000		9,721,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	9,543,000	6,719,000	9,973,000	6,777,000
Interest income recognized	26,000	22,000	51,000	28,000
Loans Receivable, Modifications, Still Accruing Interest	1,595,000	2,396,000	1,595,000	$ 2,396,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	7,150,000		7,150,000		5,762,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	2,207,000		2,207,000		2,472,000
Financing Receivable Modifications Performing Recorded Investment	1,595,000		$ 1,595,000		1,769,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			1	1
Financing Receivables, Modifications during Period, Balance			$ 46,000	$ 161,000
1-4 Family residential properties | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	334,059,000		334,059,000		352,583,000
1-4 Family residential properties | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	5,518,000		5,518,000		5,526,000
1-4 Family residential properties | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	15,566,000		15,566,000		15,409,000
1-4 Family residential properties | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	5,352,000		5,352,000		3,104,000
Current	162,357,000		162,357,000		180,947,000
Total Loans Receivable	167,709,000		167,709,000		184,051,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	2,567,000		2,567,000		4,465,000
Unpaid Principal Balance	2,567,000		2,567,000		4,465,000
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	130,000		130,000		7,597,000
Unpaid Principal Balance	130,000		130,000		7,597,000
Total Loans [Abstract]
Recorded Balance	2,697,000		2,697,000		12,062,000
Unpaid Principal Balance	2,697,000		2,697,000		12,062,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	4,522,000	301,000	4,804,000	302,000
Interest income recognized	32,000	0	61,000	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	1,574,000		1,574,000		2,105,000
Multifamily residential properties | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	150,014,000		150,014,000		163,845,000
Multifamily residential properties | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	7,792,000		7,792,000		8,144,000
Multifamily residential properties | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	9,903,000		9,903,000		12,062,000
Multifamily residential properties | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	6,627,000		6,627,000		5,496,000
Current	882,084,000		882,084,000		901,354,000
Total Loans Receivable	888,711,000		888,711,000		906,850,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	9,687,000		9,687,000		12,517,000
Unpaid Principal Balance	10,070,000		10,070,000		12,804,000
Specific Allowance	1,180,000		1,180,000		1,553,000
Loans without a specific allowance [Abstract]
Recorded Balance	1,538,000		1,538,000		983,000
Unpaid Principal Balance	1,394,000		1,394,000		1,201,000
Total Loans [Abstract]
Recorded Balance	11,225,000		11,225,000		13,500,000
Unpaid Principal Balance	11,464,000		11,464,000		14,005,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	14,414,000	8,675,000	14,844,000	8,680,000
Interest income recognized	82,000	3,000	160,000	$ 6,000
Loans Receivable, Modifications, Still Accruing Interest	1,050,000		1,050,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	5,876,000		5,876,000		8,457,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	2,505,000		2,505,000		1,706,000
Financing Receivable Modifications Performing Recorded Investment	1,050,000		$ 1,050,000		676,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			3	0
Financing Receivables, Modifications during Period, Balance			$ 1,533,000	$ 0
Commercial real estate | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	849,840,000		849,840,000		861,086,000
Commercial real estate | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	12,665,000		12,665,000		16,035,000
Commercial real estate | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	26,206,000		26,206,000		29,729,000
Commercial real estate | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	973,000		973,000		83,000
Current	117,243,000		117,243,000		135,794,000
Total Loans Receivable	118,216,000		118,216,000		135,877,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	104,000		104,000		36,000
Unpaid Principal Balance	688,000		688,000		504,000
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	734,000		734,000		631,000
Unpaid Principal Balance	150,000		150,000		163,000
Total Loans [Abstract]
Recorded Balance	838,000		838,000		667,000
Unpaid Principal Balance	838,000		838,000		667,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	823,000	1,109,000	773,000	1,061,000
Interest income recognized	1,000	0	1,000	0
Loans Receivable, Modifications, Still Accruing Interest	59,000	0	59,000	$ 0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	778,000		778,000		667,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	688,000		$ 688,000		499,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			1	0
Financing Receivables, Modifications during Period, Balance			$ 59,000	$ 0
Agricultural loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	108,270,000		108,270,000		127,863,000
Agricultural loans | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,964,000		4,964,000		7,581,000
Agricultural loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,982,000		4,982,000		433,000
Agricultural loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,275,000		4,275,000		5,329,000
Current	526,130,000		526,130,000		551,682,000
Total Loans Receivable	530,405,000		530,405,000		557,011,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	5,914,000		5,914,000		8,292,000
Unpaid Principal Balance	6,236,000		6,236,000		8,723,000
Specific Allowance	584,000		584,000		1,475,000
Loans without a specific allowance [Abstract]
Recorded Balance	741,000		741,000		1,660,000
Unpaid Principal Balance	2,310,000		2,310,000		2,027,000
Total Loans [Abstract]
Recorded Balance	6,655,000		6,655,000		9,952,000
Unpaid Principal Balance	8,546,000		8,546,000		10,750,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	9,929,000	7,672,000	10,059,000	7,892,000
Interest income recognized	1,000	0	2,000	$ 2,000
Loans Receivable, Modifications, Still Accruing Interest	70,000		70,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	6,584,000		6,584,000		8,990,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	2,029,000		2,029,000		5,112,000
Financing Receivable Modifications Performing Recorded Investment	70,000		$ 70,000		0
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			2
Financing Receivables, Modifications during Period, Balance			$ 70,000
Commercial and industrial loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	514,790,000		514,790,000		535,186,000
Commercial and industrial loans | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	6,055,000		6,055,000		9,967,000
Commercial and industrial loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	9,560,000		9,560,000		11,858,000
Commercial and industrial loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,078,000		1,078,000		1,543,000
Current	83,829,000		83,829,000		89,973,000
Total Loans Receivable	84,907,000	73,932,000	84,907,000	73,932,000	91,516,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	166,000		166,000		169,000
Unpaid Principal Balance	166,000		166,000		171,000
Specific Allowance	2,000		2,000		3,000
Loans without a specific allowance [Abstract]
Recorded Balance	534,000		534,000		471,000
Unpaid Principal Balance	731,000		731,000		1,006,000
Total Loans [Abstract]
Recorded Balance	700,000		700,000		640,000
Unpaid Principal Balance	897,000		897,000		1,177,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	742,000	329,000	781,000	349,000
Interest income recognized	0	0	0	0
Loans Receivable, Modifications, Still Accruing Interest	5,000	683,000	5,000	$ 683,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	695,000		695,000		625,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	166,000		166,000		167,000
Financing Receivable Modifications Performing Recorded Investment	5,000		$ 5,000		6,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			1	0
Financing Receivables, Modifications during Period, Balance			$ 12,000	$ 0
Consumer loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	83,485,000		83,485,000		90,133,000
Consumer loans | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	145,000		145,000		177,000
Consumer loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,277,000		1,277,000		1,206,000
Consumer loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		697,000
Current	114,459,000		114,459,000		112,680,000
Total Loans Receivable	114,459,000		114,459,000		113,377,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	0		0		6,000
Unpaid Principal Balance	0		0		6,000
Total Loans [Abstract]
Recorded Balance	0		0		6,000
Unpaid Principal Balance	0		0		6,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	0	21,000	0	21,000
Interest income recognized	0	0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	0		0		6,000
All other loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	111,827,000		111,827,000		110,352,000
All other loans | Special Mention
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,632,000		2,632,000		3,010,000
All other loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		15,000
All other loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	23,948,000		23,948,000		20,385,000
Current	1,674,608,000		1,674,608,000		1,726,353,000
Total Loans Receivable	1,698,556,000		1,698,556,000		1,746,738,000
Total Loans 90 Days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	17,514,000		17,514,000		24,106,000
Unpaid Principal Balance	17,968,000		17,968,000		24,780,000
Specific Allowance	1,691,000		1,691,000		1,801,000
Loans without a specific allowance [Abstract]
Recorded Balance	5,898,000		5,898,000		12,617,000
Unpaid Principal Balance	5,969,000		5,969,000		13,924,000
Total Loans [Abstract]
Recorded Balance	23,412,000		23,412,000		36,723,000
Unpaid Principal Balance	23,937,000		23,937,000		38,704,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	30,064,000	15,974,000	31,210,000	16,038,000
Interest income recognized	148,000	$ 25,000	288,000	$ 34,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	14,937,000		14,937,000		17,010,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	4,712,000		4,712,000		4,178,000
Financing Receivable Modifications Performing Recorded Investment	2,645,000		$ 2,645,000		2,445,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			4	1
Financing Receivables, Modifications during Period, Balance			$ 1,579,000	$ 161,000
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due	13,032,000		13,032,000		9,370,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due	482,000		482,000		460,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,916,000		4,916,000		3,347,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,604,000		3,604,000		1,149,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,021,000		2,021,000		1,349,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	903,000		903,000		63,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	522,000		522,000		1,417,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	584,000		584,000		888,000
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		697,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	11,023,000		11,023,000		6,305,000
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,951,000		2,951,000		4,353,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		43,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	205,000		205,000		804,000
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,860,000		1,860,000		3,051,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	361,000		361,000		89,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	307,000		307,000		10,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	218,000		218,000		356,000
Financing Receivables, 60 to 89 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	2,426,000		2,426,000		3,987,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans Receivable Aging Analysis [Abstract]
Total Past Due	14,291,000		14,291,000		14,314,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	47,000		47,000		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,459,000		4,459,000		4,080,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties
Loans Receivable Aging Analysis [Abstract]
Total Past Due	1,748,000		1,748,000		1,955,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	4,245,000		4,245,000		4,058,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	70,000		70,000		20,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	3,446,000		3,446,000		3,902,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	276,000		276,000		299,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | All other loans
Loans Receivable Aging Analysis [Abstract]
Total Past Due	0		0		0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans secured by real estate
Loans Receivable Aging Analysis [Abstract]
Total Past Due	$ 10,499,000		$ 10,499,000		$ 10,093,000