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Segment Information, Nature of Operations, and Certain Concentrations - Interest Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest income | $ 7,696 | $ 6,251 | $ 7,302
Mortgage Banking [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Interest income | 6,485 | 4,940 | 4,983
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Interest income | 6,485 | 4,940 | 4,983
Consolidation adjustments and other [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Other unallocated interest income | $ 1,211 | $ 1,311 | $ 2,319

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- Definition Sum of interest income from operating activities and interest and fee income from mortgage loans considered to be held-for-sale. + References No definition available. + Details
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- Definition Interest and fee income from mortgage loans considered to be held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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