Loans and Allowance for Loan Losses, Part II (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	$ 1,588,000		$ 1,588,000		$ 1,133,000
60-89 days Past Due	1,146,000		1,146,000		321,000
90 Days or More Past Due	868,000		868,000		1,433,000
Total Past Due	3,602,000		3,602,000		2,887,000
Current	1,233,147,000		1,233,147,000		1,059,519,000
Total Loans Receivable	1,236,749,000		1,236,749,000		1,062,406,000
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	1,883,000		$ 1,883,000		1,407,000
Unpaid Principal Balance	2,653,000		2,653,000		4,261,000
Specific Allowance	342,000		342,000		263,000
Loans without a specific allowance [Abstract]
Recorded Balance	1,628,000		1,628,000		3,133,000
Unpaid Principal Balance	2,129,000		2,129,000		7,902,000
Total Loans [Abstract]
Recorded Balance	3,511,000		3,511,000		4,540,000
Unpaid Principal Balance	4,782,000		4,782,000		12,163,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	3,889,000	$ 5,017,000	4,150,000	$ 5,309,000
Interest income recognized	7,000	6,000	23,000	15,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	2,967,000		2,967,000		4,105,000
Interest Lost on Nonaccrual Loans			49,000	$ 44,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	1,788,000		1,788,000		2,860,000
Troubled Debt Restructuring, Allowance	313,000		313,000		234,000
Financing Receivable Modifications Performing Recorded Investment	544,000		$ 544,000		435,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			12	4
Financing Receivables, Modifications during Period, Balance			$ 839,000	$ 749,000
Subsequent Default, Number of Days Past Due			90 days
Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,197,124,000		$ 1,197,124,000		1,026,901,000
Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	31,785,000		31,785,000		25,696,000
Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	7,840,000		7,840,000		9,809,000
Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Construction and land development
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	0		0		297,000
60-89 days Past Due	0		0		25,000
90 Days or More Past Due	0		0		0
Total Past Due	0		0		322,000
Current	33,389,000		33,389,000		21,305,000
Total Loans Receivable	33,389,000		33,389,000		21,627,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	148,000		148,000		785,000
Unpaid Principal Balance	713,000		713,000		2,960,000
Specific Allowance	20,000		20,000		43,000
Loans without a specific allowance [Abstract]
Recorded Balance	0		0		0
Unpaid Principal Balance	0		0		0
Total Loans [Abstract]
Recorded Balance	148,000		148,000		785,000
Unpaid Principal Balance	713,000		713,000		2,960,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	148,000	817,000	148,000	1,004,000
Interest income recognized	0	0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	148,000		148,000		785,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	148,000		148,000		785,000
Construction and land development | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	33,241,000		33,241,000		20,842,000
Construction and land development | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Construction and land development | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	148,000		148,000		785,000
Construction and land development | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Agricultural real estate
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	0		0		0
60-89 days Past Due	0		0		0
90 Days or More Past Due	106,000		106,000		0
Total Past Due	106,000		106,000		0
Current	120,208,000		120,208,000		110,193,000
Total Loans Receivable	120,314,000		120,314,000		110,193,000
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	25,000		25,000		73,000
Unpaid Principal Balance	29,000		29,000		235,000
Total Loans [Abstract]
Recorded Balance	25,000		25,000		73,000
Unpaid Principal Balance	29,000		29,000		235,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	25,000	34,000	92,000	35,000
Interest income recognized	0	0	2,000	0
Loans Receivable, Modifications, Still Accruing Interest	0		0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	25,000		25,000		29,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	0		0		44,000
Financing Receivable Modifications Performing Recorded Investment	0		$ 0		44,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			0
Financing Receivables, Modifications during Period, Balance			$ 0
Agricultural real estate | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	115,928,000		115,928,000		107,976,000
Agricultural real estate | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,231,000		2,231,000		1,036,000
Agricultural real estate | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,155,000		2,155,000		1,181,000
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]
30-59 days Past Due	980,000		980,000		201,000
60-89 days Past Due	534,000		534,000		224,000
90 Days or More Past Due	103,000		103,000		385,000
Total Past Due	1,617,000		1,617,000		810,000
Current	233,160,000		233,160,000		181,111,000
Total Loans Receivable	234,777,000		234,777,000		181,921,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	411,000		411,000		67,000
Unpaid Principal Balance	411,000		411,000		134,000
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	742,000		742,000		1,156,000
Unpaid Principal Balance	1,067,000		1,067,000		2,866,000
Total Loans [Abstract]
Recorded Balance	1,153,000		1,153,000		1,223,000
Unpaid Principal Balance	1,478,000		1,478,000		3,000,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	1,160,000	1,129,000	1,197,000	1,156,000
Interest income recognized	2,000	5,000	11,000	12,000
Loans Receivable, Modifications, Still Accruing Interest	339,000	345,000	339,000	$ 345,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	814,000		814,000		878,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	460,000		460,000		503,000
Financing Receivable Modifications Performing Recorded Investment	339,000		$ 339,000		345,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			4	3
Financing Receivables, Modifications during Period, Balance			$ 61,000	$ 248,000
1-4 Family residential properties | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	229,991,000		229,991,000		177,764,000
1-4 Family residential properties | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,591,000		2,591,000		1,187,000
1-4 Family residential properties | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	2,195,000		2,195,000		2,970,000
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]
30-59 days Past Due	0		0		0
60-89 days Past Due	0		0		0
90 Days or More Past Due	0		0		0
Total Past Due	0		0		0
Current	54,932,000		54,932,000		53,129,000
Total Loans Receivable	54,932,000		54,932,000		53,129,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	323,000		323,000		0
Unpaid Principal Balance	323,000		323,000		0
Specific Allowance	0		0		0
Loans without a specific allowance [Abstract]
Recorded Balance	0		0		0
Unpaid Principal Balance	0		0		0
Total Loans [Abstract]
Recorded Balance	323,000		323,000		0
Unpaid Principal Balance	323,000		323,000		0
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	326,000	0	328,000	0
Interest income recognized	0	0	0	0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	323,000		323,000		0
Multifamily residential properties | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	54,363,000		54,363,000		52,793,000
Multifamily residential properties | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	246,000		246,000		0
Multifamily residential properties | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	323,000		323,000		336,000
Multifamily residential properties | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Commercial real estate
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	77,000		77,000		60,000
60-89 days Past Due	185,000		185,000		32,000
90 Days or More Past Due	527,000		527,000		945,000
Total Past Due	789,000		789,000		1,037,000
Current	377,117,000		377,117,000		378,567,000
Total Loans Receivable	377,906,000		377,906,000		379,604,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	532,000		532,000		472,000
Unpaid Principal Balance	603,000		603,000		986,000
Specific Allowance	29,000		29,000		136,000
Loans without a specific allowance [Abstract]
Recorded Balance	242,000		242,000		1,640,000
Unpaid Principal Balance	242,000		242,000		3,808,000
Total Loans [Abstract]
Recorded Balance	774,000		774,000		2,112,000
Unpaid Principal Balance	845,000		845,000		4,794,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	777,000	2,349,000	784,000	2,379,000
Interest income recognized	1,000	1,000	2,000	2,000
Loans Receivable, Modifications, Still Accruing Interest	36,000	38,000	36,000	$ 38,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	738,000		738,000		2,074,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	288,000		288,000		1,283,000
Financing Receivable Modifications Performing Recorded Investment	36,000		$ 36,000		37,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			1	1
Financing Receivables, Modifications during Period, Balance			$ 34,000	$ 501,000
Commercial real estate | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	355,085,000		355,085,000		357,873,000
Commercial real estate | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	21,622,000		21,622,000		18,817,000
Commercial real estate | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,199,000		1,199,000		2,914,000
Commercial real estate | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Agricultural loans
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	10,000		10,000		16,000
60-89 days Past Due	222,000		222,000		20,000
90 Days or More Past Due	0		0		0
Total Past Due	232,000		232,000		36,000
Current	65,364,000		65,364,000		68,262,000
Total Loans Receivable	65,596,000		65,596,000		68,298,000
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	0		0		0
Unpaid Principal Balance	0		0		0
Total Loans [Abstract]
Recorded Balance	0		0		0
Unpaid Principal Balance	0		0		0
Agricultural loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	64,298,000		64,298,000		67,619,000
Agricultural loans | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	255,000		255,000		0
Agricultural loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	1,043,000		1,043,000		679,000
Agricultural loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Commercial and industrial loans
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	409,000		409,000		228,000
60-89 days Past Due	191,000		191,000		10,000
90 Days or More Past Due	127,000		127,000		98,000
Total Past Due	727,000		727,000		336,000
Current	294,608,000		294,608,000		223,444,000
Total Loans Receivable	295,335,000		295,335,000		223,780,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	246,000		246,000		83,000
Unpaid Principal Balance	380,000		380,000		181,000
Specific Allowance	99,000		99,000		84,000
Loans without a specific allowance [Abstract]
Recorded Balance	599,000		599,000		249,000
Unpaid Principal Balance	762,000		762,000		933,000
Total Loans [Abstract]
Recorded Balance	845,000		845,000		332,000
Unpaid Principal Balance	1,142,000		1,142,000		1,114,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	1,157,000	653,000	1,293,000	696,000
Interest income recognized	3,000	0	6,000	$ 0
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	696,000		696,000		332,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	649,000		649,000		236,000
Financing Receivable Modifications Performing Recorded Investment	149,000		$ 149,000		0
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			4	0
Financing Receivables, Modifications during Period, Balance			$ 507,000	$ 0
Commercial and industrial loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	289,991,000		289,991,000		218,193,000
Commercial and industrial loans | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	4,810,000		4,810,000		4,647,000
Commercial and industrial loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	534,000		534,000		940,000
Commercial and industrial loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
Consumer loans
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	112,000		112,000		331,000
60-89 days Past Due	14,000		14,000		10,000
90 Days or More Past Due	5,000		5,000		5,000
Total Past Due	131,000		131,000		346,000
Current	43,173,000		43,173,000		14,772,000
Total Loans Receivable	43,304,000		43,304,000		15,118,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	223,000		223,000		0
Unpaid Principal Balance	223,000		223,000		0
Specific Allowance	194,000		194,000		0
Loans without a specific allowance [Abstract]
Recorded Balance	20,000		20,000		15,000
Unpaid Principal Balance	29,000		29,000		60,000
Total Loans [Abstract]
Recorded Balance	243,000		243,000		15,000
Unpaid Principal Balance	252,000		252,000		60,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	296,000	35,000	308,000	39,000
Interest income recognized	1,000	0	2,000	1,000
Loans Receivable, Modifications, Still Accruing Interest	20,000	12,000	20,000	$ 12,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	223,000		223,000		7,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	243,000		243,000		9,000
Financing Receivable Modifications Performing Recorded Investment	20,000		$ 20,000		9,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			3	0
Financing Receivables, Modifications during Period, Balance			$ 237,000	$ 0
Consumer loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	43,031,000		43,031,000		15,105,000
Consumer loans | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	30,000		30,000		9,000
Consumer loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	243,000		243,000		4,000
Consumer loans | Doubtful
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
All other loans
Loans Receivable Aging Analysis [Abstract]
30-59 days Past Due	0		0		0
60-89 days Past Due	0		0		0
90 Days or More Past Due	0		0		0
Total Past Due	0		0		0
Current	11,196,000		11,196,000		8,736,000
Total Loans Receivable	11,196,000		11,196,000		8,736,000
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	0		0		0
Unpaid Principal Balance	0		0		0
Total Loans [Abstract]
Recorded Balance	0		0		0
Unpaid Principal Balance	0		0		0
All other loans | Pass
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	11,196,000		11,196,000		8,736,000
All other loans | Watch
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
All other loans | Substandard
Loans Receivable Aging Analysis [Abstract]
Total Loans Receivable	0		0		0
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]
30-59 days Past Due	1,057,000		1,057,000		558,000
60-89 days Past Due	719,000		719,000		281,000
90 Days or More Past Due	736,000		736,000		1,330,000
Total Past Due	2,512,000		2,512,000		2,169,000
Current	818,806,000		818,806,000		744,305,000
Total Loans Receivable	821,318,000		821,318,000		746,474,000
Total Loans 90 days & Accruing	0		0		0
Loans with a specific allowance [Abstract]
Recorded Balance	1,414,000		1,414,000		1,324,000
Unpaid Principal Balance	2,050,000		2,050,000		4,080,000
Specific Allowance	49,000		49,000		179,000
Loans without a specific allowance [Abstract]
Recorded Balance	1,009,000		1,009,000		2,869,000
Unpaid Principal Balance	1,338,000		1,338,000		6,909,000
Total Loans [Abstract]
Recorded Balance	2,423,000		2,423,000		4,193,000
Unpaid Principal Balance	3,388,000		3,388,000		10,989,000
Average recorded investment and interest income recognized [Abstract]
Average investment in impaired loans	2,436,000	4,329,000	2,549,000	4,574,000
Interest income recognized	3,000	$ 6,000	15,000	$ 14,000
Balances of Nonaccrual Loans [Abstract]
Recorded balance of nonaccrual loans	2,048,000		2,048,000		3,766,000
Troubled Debt Restructuring [Abstract]
Troubled Debt Restructurings Balance	896,000		896,000		2,615,000
Financing Receivable Modifications Performing Recorded Investment	$ 375,000		$ 375,000		$ 426,000
Recorded Balance of Troubled Debt Restructurings [Abstract]
Financing Receivables, Modifications during Period, Number			5	4
Financing Receivables, Modifications during Period, Balance			$ 95,000	$ 749,000