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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 145,256 | $ 199,071
Gross Unrealized Gain |  | 9,875 | 7,988
Gross Unrealized Loss |  | 2,882 | 2,804
Fair Value |  | 152,249 | 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 |  | 727 | 725
Gross Unrealized Gain |  | 73 | 70
Fair Value |  | 800 | 795
Other Securities | Capital trust notes |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 9,448 | 9,444
Gross Unrealized Loss |  | 2,607 | 2,480
Fair Value |  | 6,841 | 6,964
Other Securities | Preferred stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 118,205 | 118,205
Gross Unrealized Gain |  | 9,184 | 7,415
Gross Unrealized Loss |  | 275 | 248
Fair Value |  | 127,114 | 125,372
Other Securities | Mutual Funds and Common Stock |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | [2] | 16,876 |
Gross Unrealized Gain | [2] | 618 |
Fair Value | [2] | $ 17,494 |
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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