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Loans and Allowance for Loan Losses, Part II (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | $ 19,413,000 |  | $ 19,413,000 |  | $ 10,919,000
Current | 2,357,270,000 |  | 2,357,270,000 |  | 1,928,582,000
Total Loans Receivable | 2,376,683,000 | $ 1,825,634,000 | 2,376,683,000 | $ 1,825,634,000 | 1,939,501,000
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 | 18,728,000 |  | $ 18,728,000 |  | 13,345,000
Unpaid Principal Balance | 20,455,000 |  | 20,455,000 |  | 14,747,000
Specific Allowance | 542,000 |  | 542,000 |  | 623,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 6,002,000 |  | 6,002,000 |  | 4,168,000
Unpaid Principal Balance | 5,599,000 |  | 5,599,000 |  | 4,470,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 24,730,000 |  | 24,730,000 |  | 17,513,000
Unpaid Principal Balance | 26,054,000 |  | 26,054,000 |  | 19,217,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 25,105,000 | 17,968,000 | 25,361,000 | 16,333,000 |
Interest income recognized | 25,000 | 190,000 | 36,000 | 277,000 |
Loans Receivable, Modifications, Still Accruing Interest | 56,000 |  | 56,000 |  | 37,000
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 21,650,000 |  | 21,650,000 |  | 16,659,000
Interest Lost on Nonaccrual Loans |  |  | 758,000 | $ 140,000 |
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 10,611,000 |  | 10,611,000 |  | 8,898,000
Financing Receivable Modifications Performing Recorded Investment | 3,079,000 |  | $ 3,079,000 |  | 854,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 1 |  |
Recorded Balance of Troubled Debt Restructurings [Abstract] |  |  |  |  |
Financing Receivables, Modifications during Period, Number |  |  | 1 | 1 |
Financing Receivables, Modifications during Period, Balance |  |  | $ 161,000 | $ 819,000 |
Subsequent Default, Number of Days Past Due |  |  | 90 days |  |
Real Estate Acquired Through Foreclosure | 2,440,000 |  | $ 2,440,000 |  | 2,754,000
Mortgage Loans Secured By Real Estate In Foreclosure |  |  | 738,000 |  | 404,000
Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 2,290,303,000 |  | 2,290,303,000 |  | 1,860,539,000
Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 34,443,000 |  | 34,443,000 |  | 42,675,000
Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 51,756,000 |  | 51,756,000 |  | 36,287,000
Doubtful |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 181,000 |  | 181,000 |  | 0
Construction and land development |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 44,000 |  | 44,000 |  | 74,000
Current | 88,437,000 |  | 88,437,000 |  | 107,520,000
Total Loans Receivable | 88,481,000 |  | 88,481,000 |  | 107,594,000
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 | 58,000 |  | 58,000 |  | 0
Unpaid Principal Balance | 58,000 |  | 58,000 |  | 0
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 58,000 |  | 58,000 |  | 0
Unpaid Principal Balance | 58,000 |  | 58,000 |  | 0
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 44,000 | 594,000 | 44,000 | 347,000 |
Interest income recognized | 0 | 0 | 0 | 0 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 58,000 |  | 58,000 |  | 0
Construction and land development | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 87,955,000 |  | 87,955,000 |  | 107,140,000
Construction and land development | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 444,000 |  | 444,000 |  | 454,000
Construction and land development | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 82,000 |  | 82,000 |  | 0
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 | 640,000 |  | 640,000 |  | 396,000
Current | 184,247,000 |  | 184,247,000 |  | 126,787,000
Total Loans Receivable | 184,887,000 |  | 184,887,000 |  | 127,183,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 0 |  | 0 |  | 276,000
Unpaid Principal Balance | 0 |  | 0 |  | 276,000
Specific Allowance | 0 |  | 0 |  | 0
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 235,000 |  | 235,000 |  | 15,000
Unpaid Principal Balance | 235,000 |  | 235,000 |  | 15,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 235,000 |  | 235,000 |  | 291,000
Unpaid Principal Balance | 235,000 |  | 235,000 |  | 291,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 235,000 | 16,000 | 235,000 | 17,000 |
Interest income recognized | 0 | 0 | 0 | 0 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 235,000 |  | 235,000 |  | 291,000
Agricultural real estate | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 175,635,000 |  | 175,635,000 |  | 120,767,000
Agricultural real estate | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 6,628,000 |  | 6,628,000 |  | 4,829,000
Agricultural real estate | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 2,624,000 |  | 2,624,000 |  | 1,587,000
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 | 4,255,000 |  | 4,255,000 |  | 5,328,000
Current | 374,318,000 |  | 374,318,000 |  | 288,339,000
Total Loans Receivable | 378,573,000 |  | 378,573,000 |  | 293,667,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 3,540,000 |  | 3,540,000 |  | 1,026,000
Unpaid Principal Balance | 3,912,000 |  | 3,912,000 |  | 1,347,000
Specific Allowance | 19,000 |  | 19,000 |  | 25,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 3,178,000 |  | 3,178,000 |  | 2,239,000
Unpaid Principal Balance | 3,270,000 |  | 3,270,000 |  | 2,664,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 6,718,000 |  | 6,718,000 |  | 3,265,000
Unpaid Principal Balance | 7,182,000 |  | 7,182,000 |  | 4,011,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 6,719,000 | 2,929,000 | 6,777,000 | 3,121,000 |
Interest income recognized | 22,000 | 106,000 | 28,000 | 117,000 |
Loans Receivable, Modifications, Still Accruing Interest | 2,396,000 | 594,000 | 2,396,000 | $ 594,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 4,323,000 |  | 4,323,000 |  | 2,687,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 2,883,000 |  | 2,883,000 |  | 874,000
Financing Receivable Modifications Performing Recorded Investment | 2,396,000 |  | $ 2,396,000 |  | 578,000
Recorded Balance of Troubled Debt Restructurings [Abstract] |  |  |  |  |
Financing Receivables, Modifications during Period, Number |  |  | 1 | 0 |
Financing Receivables, Modifications during Period, Balance |  |  | $ 161,000 | $ 0 |
1-4 Family residential properties | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 360,561,000 |  | 360,561,000 |  | 282,441,000
1-4 Family residential properties | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 3,342,000 |  | 3,342,000 |  | 2,654,000
1-4 Family residential properties | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 14,670,000 |  | 14,670,000 |  | 8,572,000
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 | 281,000 |  | 281,000 |  | 0
Current | 105,667,000 |  | 105,667,000 |  | 61,798,000
Total Loans Receivable | 105,948,000 |  | 105,948,000 |  | 61,798,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 301,000 |  | 301,000 |  | 313,000
Unpaid Principal Balance | 301,000 |  | 301,000 |  | 313,000
Specific Allowance | 0 |  | 0 |  | 0
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 0 |  | 0 |  | 55,000
Unpaid Principal Balance | 0 |  | 0 |  | 55,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 301,000 |  | 301,000 |  | 368,000
Unpaid Principal Balance | 301,000 |  | 301,000 |  | 368,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 301,000 | 4,129,000 | 302,000 | 4,133,000 |
Interest income recognized | 0 | 51,000 | 0 | 94,000 |
Loans Receivable, Modifications, Still Accruing Interest |  | 3,395,000 |  | 3,395,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 301,000 |  | 301,000 |  | 368,000
Multifamily residential properties | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 103,653,000 |  | 103,653,000 |  | 60,954,000
Multifamily residential properties | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 464,000 |  | 464,000 |  | 476,000
Multifamily residential properties | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 1,831,000 |  | 1,831,000 |  | 368,000
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 | 7,472,000 |  | 7,472,000 |  | 3,694,000
Current | 795,890,000 |  | 795,890,000 |  | 678,063,000
Total Loans Receivable | 803,362,000 |  | 803,362,000 |  | 681,757,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 8,160,000 |  | 8,160,000 |  | 5,544,000
Unpaid Principal Balance | 8,160,000 |  | 8,160,000 |  | 5,565,000
Specific Allowance | 429,000 |  | 429,000 |  | 531,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 432,000 |  | 432,000 |  | 303,000
Unpaid Principal Balance | 493,000 |  | 493,000 |  | 368,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 8,592,000 |  | 8,592,000 |  | 5,847,000
Unpaid Principal Balance | 8,653,000 |  | 8,653,000 |  | 5,933,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 8,675,000 | 7,068,000 | 8,680,000 | 5,316,000 |
Interest income recognized | 3,000 | 31,000 | 6,000 | 62,000 |
Loans Receivable, Modifications, Still Accruing Interest | 683,000 | 2,087,000 | 683,000 | 2,087,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 7,909,000 |  | 7,909,000 |  | 5,596,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 1,897,000 |  | 1,897,000 |  | 1,376,000
Financing Receivable Modifications Performing Recorded Investment | 683,000 |  | 683,000 |  | 251,000
Commercial real estate | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 766,400,000 |  | 766,400,000 |  | 647,208,000
Commercial real estate | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 14,079,000 |  | 14,079,000 |  | 16,941,000
Commercial real estate | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 22,702,000 |  | 22,702,000 |  | 17,608,000
Commercial real estate | Doubtful |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 181,000 |  | 181,000 |  | 0
Agricultural loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 486,000 |  | 486,000 |  | 190,000
Current | 113,047,000 |  | 113,047,000 |  | 86,441,000
Total Loans Receivable | 113,533,000 |  | 113,533,000 |  | 86,631,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 154,000 |  | 154,000 |  | 212,000
Unpaid Principal Balance | 1,002,000 |  | 1,002,000 |  | 1,009,000
Specific Allowance | 30,000 |  | 30,000 |  | 2,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 955,000 |  | 955,000 |  | 545,000
Unpaid Principal Balance | 359,000 |  | 359,000 |  | 0
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 1,109,000 |  | 1,109,000 |  | 757,000
Unpaid Principal Balance | 1,361,000 |  | 1,361,000 |  | 1,009,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 1,109,000 | 826,000 | 1,061,000 | 930,000 |
Interest income recognized | 0 | 0 | 0 | $ 0 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 1,109,000 |  | 1,109,000 |  | 757,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 745,000 |  | $ 745,000 |  | 757,000
Recorded Balance of Troubled Debt Restructurings [Abstract] |  |  |  |  |
Financing Receivables, Modifications during Period, Number |  |  | 0 | 1 |
Financing Receivables, Modifications during Period, Balance |  |  | $ 0 | $ 819,000 |
Agricultural loans | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 109,985,000 |  | 109,985,000 |  | 83,469,000
Agricultural loans | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 2,622,000 |  | 2,622,000 |  | 2,304,000
Agricultural loans | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 926,000 |  | 926,000 |  | 858,000
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 | 5,136,000 |  | 5,136,000 |  | 965,000
Current | 497,075,000 |  | 497,075,000 |  | 443,298,000
Total Loans Receivable | 502,211,000 |  | 502,211,000 |  | 444,263,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 6,414,000 |  | 6,414,000 |  | 5,774,000
Unpaid Principal Balance | 6,921,000 |  | 6,921,000 |  | 6,037,000
Specific Allowance | 64,000 |  | 64,000 |  | 64,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 953,000 |  | 953,000 |  | 909,000
Unpaid Principal Balance | 968,000 |  | 968,000 |  | 1,249,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 7,367,000 |  | 7,367,000 |  | 6,683,000
Unpaid Principal Balance | 7,889,000 |  | 7,889,000 |  | 7,286,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 7,672,000 | 1,781,000 | 7,892,000 | 1,841,000 |
Interest income recognized | 0 | 2,000 | 2,000 | 4,000 |
Loans Receivable, Modifications, Still Accruing Interest |  | 33,000 |  | 33,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 7,365,000 |  | 7,365,000 |  | 6,658,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 4,933,000 |  | 4,933,000 |  | 5,690,000
Financing Receivable Modifications Performing Recorded Investment | 0 |  | 0 |  | 25,000
Commercial and industrial loans | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 489,913,000 |  | 489,913,000 |  | 425,846,000
Commercial and industrial loans | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 4,112,000 |  | 4,112,000 |  | 11,492,000
Commercial and industrial loans | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 8,186,000 |  | 8,186,000 |  | 6,925,000
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 | 1,099,000 |  | 1,099,000 |  | 272,000
Current | 57,991,000 |  | 57,991,000 |  | 29,477,000
Total Loans Receivable | 59,090,000 |  | 59,090,000 |  | 29,749,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 159,000 |  | 159,000 |  | 200,000
Unpaid Principal Balance | 159,000 |  | 159,000 |  | 200,000
Specific Allowance | 0 |  | 0 |  | 1,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 170,000 |  | 170,000 |  | 102,000
Unpaid Principal Balance | 195,000 |  | 195,000 |  | 119,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 329,000 |  | 329,000 |  | 302,000
Unpaid Principal Balance | 354,000 |  | 354,000 |  | 319,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 329,000 | 625,000 | 349,000 | 628,000 |
Interest income recognized | 0 | 0 | 0 | 0 |
Loans Receivable, Modifications, Still Accruing Interest |  | 2,000 |  | 2,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 329,000 |  | 329,000 |  | 302,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 153,000 |  | 153,000 |  | 201,000
Consumer loans | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 58,377,000 |  | 58,377,000 |  | 29,375,000
Consumer loans | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 9,000 |  | 9,000 |  | 5,000
Consumer loans | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 704,000 |  | 704,000 |  | 369,000
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 |  | 0
Current | 140,598,000 |  | 140,598,000 |  | 106,859,000
Total Loans Receivable | 140,598,000 |  | 140,598,000 |  | 106,859,000
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 | 21,000 |  | 21,000 |  | 0
Unpaid Principal Balance | 21,000 |  | 21,000 |  | 0
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 21,000 |  | 21,000 |  | 0
Unpaid Principal Balance | 21,000 |  | 21,000 |  | 0
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 21,000 | 0 | 21,000 | 0 |
Interest income recognized | 0 | 0 | 0 | 0 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 21,000 |  | 21,000 |  | 0
All other loans | Pass |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 137,824,000 |  | 137,824,000 |  | 103,339,000
All other loans | Special Mention |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 2,743,000 |  | 2,743,000 |  | 3,520,000
All other loans | Substandard |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Loans Receivable | 31,000 |  | 31,000 |  | 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] |  |  |  |  |
Total Past Due | 12,692,000 |  | 12,692,000 |  | 9,492,000
Current | 1,548,559,000 |  | 1,548,559,000 |  | 1,262,507,000
Total Loans Receivable | 1,561,251,000 |  | 1,561,251,000 |  | 1,271,999,000
Total Loans 90 Days & Accruing | 0 |  | 0 |  | 0
Loans with a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 12,001,000 |  | 12,001,000 |  | 7,159,000
Unpaid Principal Balance | 12,373,000 |  | 12,373,000 |  | 7,501,000
Specific Allowance | 448,000 |  | 448,000 |  | 556,000
Loans without a specific allowance [Abstract] |  |  |  |  |
Recorded Balance | 3,903,000 |  | 3,903,000 |  | 2,612,000
Unpaid Principal Balance | 4,056,000 |  | 4,056,000 |  | 3,102,000
Total Loans [Abstract] |  |  |  |  |
Recorded Balance | 15,904,000 |  | 15,904,000 |  | 9,771,000
Unpaid Principal Balance | 16,429,000 |  | 16,429,000 |  | 10,603,000
Average recorded investment and interest income recognized [Abstract] |  |  |  |  |
Average investment in impaired loans | 15,974,000 | 14,736,000 | 16,038,000 | 12,934,000 |
Interest income recognized | 25,000 | $ 188,000 | 34,000 | $ 273,000 |
Balances of Nonaccrual Loans [Abstract] |  |  |  |  |
Recorded balance of nonaccrual loans | 12,826,000 |  | 12,826,000 |  | 8,942,000
Troubled Debt Restructuring [Abstract] |  |  |  |  |
Troubled Debt Restructurings Balance | 4,780,000 |  | 4,780,000 |  | 2,250,000
Financing Receivable Modifications Performing Recorded Investment | 3,079,000 |  | 3,079,000 |  | 829,000
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 9,802,000 |  | 9,802,000 |  | 3,509,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 26,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 640,000 |  | 640,000 |  | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 Family residential properties |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 2,396,000 |  | 2,396,000 |  | 3,023,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily residential properties |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 281,000 |  | 281,000 |  | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 3,445,000 |  | 3,445,000 |  | 90,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 365,000 |  | 365,000 |  | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 1,891,000 |  | 1,891,000 |  | 192,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 784,000 |  | 784,000 |  | 178,000
Financing Receivables, 30 to 59 Days Past Due [Member] | All other loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans secured by real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 6,762,000 |  | 6,762,000 |  | 3,139,000
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 3,936,000 |  | 3,936,000 |  | 726,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 48,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 Family residential properties |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 977,000 |  | 977,000 |  | 538,000
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 | 1,495,000 |  | 1,495,000 |  | 38,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 11,000 |  | 11,000 |  | 32,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 1,140,000 |  | 1,140,000 |  | 3,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 313,000 |  | 313,000 |  | 67,000
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 | 2,472,000 |  | 2,472,000 |  | 624,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 5,675,000 |  | 5,675,000 |  | 6,684,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 44,000 |  | 44,000 |  | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 396,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 Family residential properties |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 882,000 |  | 882,000 |  | 1,767,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multifamily residential properties |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 0 |  | 0 |  | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 2,532,000 |  | 2,532,000 |  | 3,566,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Agricultural loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 110,000 |  | 110,000 |  | 158,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 2,105,000 |  | 2,105,000 |  | 770,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer loans |  |  |  |  |
Loans Receivable Aging Analysis [Abstract] |  |  |  |  |
Total Past Due | 2,000 |  | 2,000 |  | 27,000
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 | $ 3,458,000 |  | $ 3,458,000 |  | $ 5,729,000

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