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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Allowance (Details) | 12 Months Ended |
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Dec. 31, 2016 USD ($) alternative | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 08, 2016 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |
Minimum balance of adversely classified loan in which a detailed analysis is performed | $ 250,000 |  |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |  |
Balance, beginning of year | $ 14,576,000 | $ 13,682,000 | $ 13,249,000 |
Provision for loan losses | 2,826,000 | 1,318,000 | 629,000 |
Losses charged off | (1,675,000) | (906,000) | (537,000) |
Recoveries | 1,026,000 | 482,000 | 341,000 |
Balance, end of period | 16,753,000 | 14,576,000 | 13,682,000 |
Individually evaluated for impairment | 858,000 | 134,000 | 263,000 |
Collectively evaluated for impairment | 15,881,000 | 14,442,000 | 13,419,000 |
Ending balance | 1,825,992,000 | 1,281,889,000 | 1,062,406,000 |
Individually evaluated for impairment | 5,266,000 | 1,174,000 | 3,301,000 |
Collectively evaluated for impairment | $ 1,812,640,000 | 1,280,715,000 | 1,059,105,000 |
Financing Receivable, Net |  |  |  | $ 8,688,000
Unsecured Open-end Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Period When Loans Are Charged Down | 180 days |  |  |
Other Secured Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Period When Loans Are Charged Down | 120 days |  |  |
Commercial/Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Balance, beginning of year | $ 11,379,000 | 10,914,000 | 10,646,000 |
Provision for loan losses | 1,467,000 | 451,000 | 192,000 |
Losses charged off | (747,000) | (289,000) | (86,000) |
Recoveries | 802,000 | 303,000 | 162,000 |
Balance, end of period | 12,901,000 | 11,379,000 | 10,914,000 |
Individually evaluated for impairment | 192,000 | 134,000 | 263,000 |
Collectively evaluated for impairment | 12,695,000 | 11,245,000 | 10,651,000 |
Ending balance | 1,204,799,000 | 807,736,000 | 684,552,000 |
Individually evaluated for impairment | 1,956,000 | 744,000 | 3,301,000 |
Collectively evaluated for impairment | 1,199,003,000 | 806,992,000 | 681,251,000 |
Agriculture/Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Balance, beginning of year | 1,337,000 | 1,360,000 | 533,000 |
Provision for loan losses | 933,000 | (25,000) | 825,000 |
Losses charged off | (30,000) | 0 | 0 |
Recoveries | 9,000 | 2,000 | 2,000 |
Balance, end of period | 2,249,000 | 1,337,000 | 1,360,000 |
Individually evaluated for impairment | 660,000 | 0 | 0 |
Collectively evaluated for impairment | 1,589,000 | 1,337,000 | 1,360,000 |
Ending balance | 212,513,000 | 198,066,000 | 178,091,000 |
Individually evaluated for impairment | 1,345,000 | 430,000 | 0 |
Collectively evaluated for impairment | 211,168,000 | 197,636,000 | 178,091,000 |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Balance, beginning of year | 994,000 | 790,000 | 771,000 |
Provision for loan losses | 113,000 | 267,000 | 135,000 |
Losses charged off | (234,000) | (64,000) | (140,000) |
Recoveries | 1,000 | 1,000 | 24,000 |
Balance, end of period | 874,000 | 994,000 | 790,000 |
Individually evaluated for impairment | 6,000 | 0 | 0 |
Collectively evaluated for impairment | 868,000 | 994,000 | 790,000 |
Ending balance | 366,823,000 | 232,348,000 | 184,661,000 |
Individually evaluated for impairment | 1,752,000 | 0 | 0 |
Collectively evaluated for impairment | $ 360,825,000 | 232,348,000 | 184,661,000 |
1-4 Family residential properties |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Period When Loans Are Charged Down | 180 days |  |  |
Consumer loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Balance, beginning of year | $ 642,000 | 386,000 | 377,000 |
Provision for loan losses | 501,000 | 633,000 | 167,000 |
Losses charged off | (664,000) | (553,000) | (311,000) |
Recoveries | 214,000 | 176,000 | 153,000 |
Balance, end of period | 693,000 | 642,000 | 386,000 |
Individually evaluated for impairment | 0 | 0 | 0 |
Collectively evaluated for impairment | 693,000 | 642,000 | 386,000 |
Ending balance | 41,857,000 | 43,739,000 | 15,102,000 |
Individually evaluated for impairment | 213,000 | 0 | 0 |
Collectively evaluated for impairment | 41,644,000 | 43,739,000 | 15,102,000 |
Unallocated [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Balance, beginning of year | 224,000 | 232,000 | 922,000 |
Provision for loan losses | (188,000) | (8,000) | (690,000) |
Losses charged off | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 |
Balance, end of period | 36,000 | 224,000 | 232,000 |
Individually evaluated for impairment | 0 | 0 | 0 |
Collectively evaluated for impairment | 36,000 | 224,000 | 232,000 |
Ending balance | 0 | 0 | 0 |
Individually evaluated for impairment | 0 | 0 | 0 |
Collectively evaluated for impairment | 0 | $ 0 | $ 0 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 14,000 |  |  |
Financing Receivable, Net | 8,086,000 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial/Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 14,000 |  |  |
Financing Receivable, Net | 3,840,000 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] | Agriculture/Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  |  |
Financing Receivable, Net | 0 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  |  |
Financing Receivable, Net | 4,246,000 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  |  |
Financing Receivable, Net | 0 |  |  |
Receivables Acquired with Deteriorated Credit Quality [Member] | Unallocated [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  |  |
Financing Receivable, Net | $ 0 |  |  |

X
- Definition Amount net of deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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- Definition Minimum balance of adversely classified loan in which a detailed analysis is performed. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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