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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 550,748 | $ 521,053
Gross Unrealized Gain | 1,320 | 1,164
Gross Unrealized Loss | 4,058 | 5,253
Estimated Fair Value | 548,010 | 516,964
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 159,203 | 159,789
Gross Unrealized Gain | 431 | 236
Gross Unrealized Loss | 860 | 1,995
Estimated Fair Value | 158,774 | 158,030
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,045 | 13,391
Gross Unrealized Gain | 0 | 319
Gross Unrealized Loss | 8 | 9
Estimated Fair Value | 1,037 | 13,701
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,008 | 5,010
Gross Unrealized Gain | 14 | 5
Gross Unrealized Loss |  | 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 | 526 | 522
Estimated Fair Value | 22,390 | 22,394
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 262,713 | 230,489
Gross Unrealized Gain | 862 | 598
Gross Unrealized Loss | 1,480 | 1,457
Estimated Fair Value | 262,095 | 229,630
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 87,855 | 77,447
Gross Unrealized Gain | 13 | 6
Gross Unrealized Loss | 940 | 1,002
Estimated Fair Value | 86,928 | 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 | 53 | 58
Estimated Fair Value | 7,446 | 7,441
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,354 | 4,356
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 191 | 210
Estimated Fair Value | 4,163 | 4,146
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 155 | 156
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss |  | 0
Estimated Fair Value | 155 | 156
Collateralized home equity conversion mortgages [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value | $ 50,500 | $ 52,900

X
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