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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, 2017 USD ($) Security | Dec. 31, 2016 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 2,691 | $ 4,496
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 276,372 | $ 320,260
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 93 | 128
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 2,593 | $ 757
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 138,033 | $ 26,991
Available-for-sale, 12 Months or More, Number of Securities | Security | 67 | 15
Available-for-sale, Gross Unrealized Loss | $ 5,284 | $ 5,253
Available-for-sale, Estimated Fair Value | $ 414,405 | $ 347,251
Available-for-sale, Number of Securities | Security | 160 | 143
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 1,855 | $ 1,345
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 197,621 | $ 102,647
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 66 | 38
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 847 | $ 112
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 56,998 | $ 11,350
Available-for-sale, 12 Months or More, Number of Securities | Security | 25 | 3
Available-for-sale, Gross Unrealized Loss | $ 2,702 | $ 1,457
Available-for-sale, Estimated Fair Value | $ 254,619 | $ 113,997
Available-for-sale, Number of Securities | Security | 91 | 41
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 773 | $ 676
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 65,726 | $ 60,786
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 20 | 27
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 1,125 | $ 326
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 49,986 | $ 10,579
Available-for-sale, 12 Months or More, Number of Securities | Security | 32 | 7
Available-for-sale, Gross Unrealized Loss | $ 1,898 | $ 1,002
Available-for-sale, Estimated Fair Value | $ 115,712 | $ 71,365
Available-for-sale, Number of Securities | Security | 52 | 34
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 15 | $ 58
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 1,484 | $ 7,441
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 1 | 3
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 70 | $ 0
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 5,930 | $ 0
Available-for-sale, 12 Months or More, Number of Securities | Security | 2 | 0
Available-for-sale, Gross Unrealized Loss | $ 85 | $ 58
Available-for-sale, Estimated Fair Value | $ 7,414 | $ 7,441
Available-for-sale, Number of Securities | Security | 3 | 3
SBA loan pool securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |  | $ 0
Available-for-sale, Less Than 12 Months, Estimated Fair Value |  | $ 0
Available-for-sale, Less Than 12 Months, Number of Securities | Security |  | 0
Available-for-sale, 12 Months or More, Gross Unrealized Loss |  | $ 210
Available-for-sale, 12 Months or More, Estimated Fair Value |  | $ 4,146
Available-for-sale, 12 Months or More, Number of Securities | Security |  | 2
Available-for-sale, Gross Unrealized Loss |  | $ 210
Available-for-sale, Estimated Fair Value |  | $ 4,146
Available-for-sale, Number of Securities | Security |  | 2
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 48 | $ 1,995
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 11,541 | $ 125,004
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 6 | 54
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 21 | $ 0
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 2,737 | $ 0
Available-for-sale, 12 Months or More, Number of Securities | Security | 2 | 0
Available-for-sale, Gross Unrealized Loss | $ 69 | $ 1,995
Available-for-sale, Estimated Fair Value | $ 14,278 | $ 125,004
Available-for-sale, Number of Securities | Security | 8 | 54
Municipal bonds-taxable [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |  | $ 9
Available-for-sale, Less Than 12 Months, Estimated Fair Value |  | $ 2,904
Available-for-sale, Less Than 12 Months, Number of Securities | Security |  | 2
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 |  | $ 9
Available-for-sale, Estimated Fair Value |  | $ 2,904
Available-for-sale, Number of Securities | Security |  | 2
Other securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-sale, Less Than 12 Months, Gross Unrealized Loss | $ 0 | $ 413
Available-for-sale, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 21,478
Available-for-sale, Less Than 12 Months, Number of Securities | Security | 0 | 4
Available-for-sale, 12 Months or More, Gross Unrealized Loss | $ 530 | $ 109
Available-for-sale, 12 Months or More, Estimated Fair Value | $ 22,382 | $ 916
Available-for-sale, 12 Months or More, Number of Securities | Security | 6 | 3
Available-for-sale, Gross Unrealized Loss | $ 530 | $ 522
Available-for-sale, Estimated Fair Value | $ 22,382 | $ 22,394
Available-for-sale, Number of Securities | Security | 6 | 7

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