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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 667,640 | $ 700,627
Gross Unrealized Gain | 8,390 | 2,488
Gross Unrealized Loss | 998 | 4,819
Estimated Fair Value | 675,032 | 698,296
Municipal bonds-tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 161,527 | 162,101
Gross Unrealized Gain | 4,599 | 1,820
Gross Unrealized Loss | 0 | 19
Estimated Fair Value | 166,126 | 163,902
Municipal bonds-taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,888 | 13,932
Gross Unrealized Gain | 425 | 189
Gross Unrealized Loss | 0 | 88
Estimated Fair Value | 14,313 | 14,033
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,016 | 5,017
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 18 | 24
Estimated Fair Value | 4,998 | 4,993
Mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 22,916 | 22,916
Gross Unrealized Gain | 240 | 0
Gross Unrealized Loss | 87 | 163
Estimated Fair Value | 23,069 | 22,753
Collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 91,947 | 97,904
Gross Unrealized Gain | 404 | 79
Gross Unrealized Loss | 222 | 997
Estimated Fair Value | 92,129 | 96,986
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 271,395 | 286,450
Gross Unrealized Gain | 2,642 | 392
Gross Unrealized Loss | 447 | 2,461
Estimated Fair Value | 273,590 | 284,381
U.S. government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,982 | 48,478
Gross Unrealized Gain | 66 | 0
Gross Unrealized Loss | 8 | 656
Estimated Fair Value | 40,040 | 47,822
SBA loan pool securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 60,811 | 63,670
Gross Unrealized Gain | 12 | 7
Gross Unrealized Loss | 216 | 411
Estimated Fair Value | 60,607 | 63,266
U.S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 158 | 159
Gross Unrealized Gain | 2 | 1
Gross Unrealized Loss | 0 | 0
Estimated Fair Value | 160 | 160
Collateralized home equity conversion mortgages [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value | $ 56,900 | $ 58,600

X
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