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Aggregate Contractual or Notional Amounts and Fair Value of Derivative Financial Instruments (Detail) - USD ($) | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Feb. 28, 2014 | Oct. 31, 2013
--- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount | $ 5,335,000 |  | $ 8,937,000 |  |
Derivative Assets |  |  | 5,000 |  |
Derivative Liabilities | 251,000 |  | 214,000 |  |
Derivatives Not Designated As Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount |  |  | 4,574,000 |  |
Derivative Assets |  |  | 5,000 |  |
Derivative Liabilities |  |  | 5,000 |  |
IRLCs | Derivatives Not Designated As Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount |  |  | 1,391,000 |  |
Derivative Assets |  |  | 5,000 |  |
Interest Rate Swaps Agreement |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount |  | $ 1,200,000 |  | $ 4,370,000 | $ 3,500,000
Interest Rate Swaps Agreement | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount | 5,335,000 |  | 4,363,000 |  |
Derivative Liabilities | $ 251,000 |  | 209,000 |  |
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional or Contractual Amount |  |  | 3,183,000 |  |
Derivative Liabilities |  |  | $ 5,000 |  |

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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 value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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