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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 145,262 | $ 199,071
Gross Unrealized Gain |  | 11,697 | 7,988
Gross Unrealized Loss |  | 2,689 | 2,804
Fair Value |  | 154,270 | 204,255
Mortgage-Related Securities | GSE certificates |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | [1] |  | 53,820
Gross Unrealized Gain | [1] |  | 33
Gross Unrealized Loss | [1] |  | 1
Fair Value | [1] |  | 53,852
Other Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 145,251
Gross Unrealized Gain |  |  | 7,955
Gross Unrealized Loss |  |  | 2,803
Fair Value |  |  | 150,403
Other Securities | Municipal bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 729 | 725
Gross Unrealized Gain |  | 82 | 70
Fair Value |  | 811 | 795
Other Securities | Capital trust notes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 9,451 | 9,444
Gross Unrealized Loss |  | 2,658 | 2,480
Fair Value |  | 6,793 | 6,964
Other Securities | Preferred stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 118,205 | 118,205
Gross Unrealized Gain |  | 10,869 | 7,415
Gross Unrealized Loss |  | 31 | 248
Fair Value |  | 129,043 | 125,372
Other Securities | Mutual Funds and Common Stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | [2] | 16,877 |
Gross Unrealized Gain | [2] | 746 |
Fair Value | [2] | $ 17,623 |
Other Securities | Common stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 16,877
Gross Unrealized Gain |  |  | 470
Gross Unrealized Loss |  |  | 75
Fair Value |  |  | $ 17,272
[1] | Government-sponsored enterprise.
[2] | Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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