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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 571,611 | $ 521,053
Gross Unrealized Gain | 3,370 | 1,164
Gross Unrealized Loss | 3,135 | 5,253
Estimated Fair Value | 571,846 | 516,964
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 158,614 | 159,789
Gross Unrealized Gain | 2,567 | 236
Gross Unrealized Loss | 118 | 1,995
Estimated Fair Value | 161,063 | 158,030
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 531 | 13,391
Gross Unrealized Gain | 6 | 319
Gross Unrealized Loss | 0 | 9
Estimated Fair Value | 537 | 13,701
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,006 | 5,010
Gross Unrealized Gain | 16 | 5
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 5,022 | 5,015
Mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,916 | 22,916
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 401 | 522
Estimated Fair Value | 22,515 | 22,394
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 280,494 | 230,489
Gross Unrealized Gain | 767 | 598
Gross Unrealized Loss | 1,496 | 1,457
Estimated Fair Value | 279,765 | 229,630
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 92,360 | 77,447
Gross Unrealized Gain | 14 | 6
Gross Unrealized Loss | 936 | 1,002
Estimated Fair Value | 91,438 | 76,451
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,499 | 7,499
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 42 | 58
Estimated Fair Value | 7,457 | 7,441
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,037 | 4,356
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 142 | 210
Estimated Fair Value | 3,895 | 4,146
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 154 | 156
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 154 | 156
Collateralized home equity conversion mortgages [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value | $ 9,100 | $ 52,900

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