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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 700,627 | $ 1,061,703
Gross Unrealized Gain | 2,488 | 3,980
Gross Unrealized Loss | 4,819 | 4,966
Estimated Fair Value | 698,296 | 1,060,717
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 162,101 | 4,319
Gross Unrealized Gain | 1,820 | 71
Gross Unrealized Loss | 19 | 0
Estimated Fair Value | 163,902 | 4,390
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,932 | 16,615
Gross Unrealized Gain | 189 | 398
Gross Unrealized Loss | 88 | 91
Estimated Fair Value | 14,033 | 16,922
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,017 | 17,018
Gross Unrealized Gain | 0 | 2
Gross Unrealized Loss | 24 | 72
Estimated Fair Value | 4,993 | 16,948
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 97,904 | 188,704
Gross Unrealized Gain | 79 | 417
Gross Unrealized Loss | 997 | 1,074
Estimated Fair Value | 96,986 | 188,047
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 286,450 | 571,678
Gross Unrealized Gain | 392 | 2,811
Gross Unrealized Loss | 2,461 | 1,203
Estimated Fair Value | 284,381 | 573,286
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 48,478 | 129,857
Gross Unrealized Gain | 0 | 172
Gross Unrealized Loss | 656 | 1,822
Estimated Fair Value | 47,822 | 128,207
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 63,670 | 109,983
Gross Unrealized Gain | 7 | 52
Gross Unrealized Loss | 411 | 588
Estimated Fair Value | 63,266 | 109,447
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 159 | 163
Gross Unrealized Gain | 1 | 0
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 160 | 163
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,916 | 22,916
Gross Unrealized Gain | 0 | 57
Gross Unrealized Loss | 163 | 80
Estimated Fair Value | $ 22,753 | 22,893
Equity securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 450
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 36
Estimated Fair Value |  | $ 414

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