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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Security | Dec. 31, 2015 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 4,496 | $ 2,628
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 320,260 | $ 359,531
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 128 | 104
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 757 | $ 2,191
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 26,991 | $ 87,120
Available-for-sale, 12 Months or More, Number of Securities | Security | 15 | 36
Available-for-sale, Gross Unrealized Loss | $ 5,253 | $ 4,819
Available-for-sale, Estimated Fair Value | $ 347,251 | $ 446,651
Available-for-sale, Number of Securities | Security | 143 | 140
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 1,345 | $ 1,734
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 102,647 | $ 193,931
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 38 | 52
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 112 | $ 727
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 11,350 | $ 21,659
Available-for-sale, 12 Months or More, Number of Securities | Security | 3 | 9
Available-for-sale, Gross Unrealized Loss | $ 1,457 | $ 2,461
Available-for-sale, Estimated Fair Value | $ 113,997 | $ 215,590
Available-for-sale, Number of Securities | Security | 41 | 61
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 676 | $ 335
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 60,786 | $ 48,970
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 27 | 18
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 326 | $ 662
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 10,579 | $ 32,964
Available-for-sale, 12 Months or More, Number of Securities | Security | 7 | 13
Available-for-sale, Gross Unrealized Loss | $ 1,002 | $ 997
Available-for-sale, Estimated Fair Value | $ 71,365 | $ 81,934
Available-for-sale, Number of Securities | Security | 34 | 31
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 58 | $ 201
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 7,441 | $ 23,289
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 3 | 8
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 0 | $ 455
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 0 | $ 24,533
Available-for-sale, 12 Months or More, Number of Securities | Security | 0 | 8
Available-for-sale, Gross Unrealized Loss | $ 58 | $ 656
Available-for-sale, Estimated Fair Value | $ 7,441 | $ 47,822
Available-for-sale, Number of Securities | Security | 3 | 16
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 0 | $ 161
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 50,499
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 0 | 12
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 210 | $ 250
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 4,146 | $ 7,036
Available-for-sale, 12 Months or More, Number of Securities | Security | 2 | 3
Available-for-sale, Gross Unrealized Loss | $ 210 | $ 411
Available-for-sale, Estimated Fair Value | $ 4,146 | $ 57,535
Available-for-sale, Number of Securities | Security | 2 | 15
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 1,995 | $ 19
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 125,004 | $ 8,922
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 54 | 6
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 0 | $ 0
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 0 | $ 0
Available-for-sale, 12 Months or More, Number of Securities | Security | 0 | 0
Available-for-sale, Gross Unrealized Loss | $ 1,995 | $ 19
Available-for-sale, Estimated Fair Value | $ 125,004 | $ 8,922
Available-for-sale, Number of Securities | Security | 54 | 6
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 9 | $ 88
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 2,904 | $ 7,106
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 2 | 4
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 0 | $ 0
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 0 | $ 0
Available-for-sale, 12 Months or More, Number of Securities | Security | 0 | 0
Available-for-sale, Gross Unrealized Loss | $ 9 | $ 88
Available-for-sale, Estimated Fair Value | $ 2,904 | $ 7,106
Available-for-sale, Number of Securities | Security | 2 | 4
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |  | $ 24
Available-for-sale, Less Than 12 Months, Estimated Fair Value |  | $ 4,994
Available-for-sale, Less Than 12 Months, Number of Securities | Security |  | 1
Available-for-sale, 12 Months or More, Gross Unrealized Loss |  | $ 0
Available-for-sale, 12 Months or More, Estimated Fair Value |  | $ 0
Available-for-sale, 12 Months or More, Number of Securities | Security |  | 0
Available-for-sale, Gross Unrealized Loss |  | $ 24
Available-for-sale, Estimated Fair Value |  | $ 4,994
Available-for-sale, Number of Securities | Security |  | 1
Other securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 413 | $ 66
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 21,478 | $ 21,820
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 4 | 3
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 109 | $ 97
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 916 | $ 928
Available-for-sale, 12 Months or More, Number of Securities | Security | 3 | 3
Available-for-sale, Gross Unrealized Loss | $ 522 | $ 163
Available-for-sale, Estimated Fair Value | $ 22,394 | $ 22,748
Available-for-sale, Number of Securities | Security | 7 | 6

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