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Derivatives - Additional Information (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 28, 2017 USD ($) InterestRateSwap | Mar. 31, 2017 | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |
Lock in period for interest rates |  | 45 days |  |
Long-term debt |  |  | $ 43,790,000 | $ 44,892,000
Subsequent Event | Wells Fargo Bank |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 100,000,000 |  |  |
Subordinated Debentures |  |  |  |
Derivative [Line Items] |  |  |  |
Long-term debt |  |  | 30,930,000 |
Interest Rate Contracts with Corporate Customers |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | 92,142,000 | 22,243,000
Offsetting Interest Rate Contracts with Other Financial Institutions |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | 92,142,000 | 22,243,000
Interest Rate Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value on swap |  |  | 1,350,000 | 586,000
Interest Rate Swaps | Subsequent Event | Wells Fargo Bank |  |  |  |
Derivative [Line Items] |  |  |  |
Number of derivative instruments | InterestRateSwap | 3 |  |  |
Interest Rate Swaps | Subordinated Debentures |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | 30,000,000 |
Fair value on swap |  |  | 0 |
Interest Rate Swaps Three | Subsequent Event | Wells Fargo Bank |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 30,000,000 |  |  |
Derivative notional amount maturity period | 3 years |  |  |
Interest Rate Swaps Four | Subsequent Event | Wells Fargo Bank |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 35,000,000 |  |  |
Derivative notional amount maturity period | 4 years |  |  |
Interest Rate Swaps Five | Subsequent Event | Wells Fargo Bank |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 35,000,000 |  |  |
Derivative notional amount maturity period | 5 years |  |  |
Commitments to Fund Fixed-Rate Mortgage Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | 546,520,000 | 532,920,000
Commitments to Sell Residential Mortgage Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | $ 751,500,000 | $ 829,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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