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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 521,053 | $ 700,627
Gross Unrealized Gain | 1,164 | 2,488
Gross Unrealized Loss | 5,253 | 4,819
Estimated Fair Value | 516,964 | 698,296
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 77,447 | 97,904
Gross Unrealized Gain | 6 | 79
Gross Unrealized Loss | 1,002 | 997
Estimated Fair Value | 76,451 | 96,986
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 230,489 | 286,450
Gross Unrealized Gain | 598 | 392
Gross Unrealized Loss | 1,457 | 2,461
Estimated Fair Value | 229,630 | 284,381
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,499 | 48,478
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 58 | 656
Estimated Fair Value | 7,441 | 47,822
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,356 | 63,670
Gross Unrealized Gain | 0 | 7
Gross Unrealized Loss | 210 | 411
Estimated Fair Value | 4,146 | 63,266
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 159,789 | 162,101
Gross Unrealized Gain | 236 | 1,820
Gross Unrealized Loss | 1,995 | 19
Estimated Fair Value | 158,030 | 163,902
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,391 | 13,932
Gross Unrealized Gain | 319 | 189
Gross Unrealized Loss | 9 | 88
Estimated Fair Value | 13,701 | 14,033
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,010 | 5,017
Gross Unrealized Gain | 5 | 0
Gross Unrealized Loss | 0 | 24
Estimated Fair Value | 5,015 | 4,993
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 156 | 159
Gross Unrealized Gain | 0 | 1
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 156 | 160
Other securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,916 | 22,916
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 522 | 163
Estimated Fair Value | $ 22,394 | $ 22,753

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