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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | Dec. 31, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 321 | $ 2,691
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 78,252 | $ 276,372
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 20 | 93
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 8,616 | $ 2,593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 410,128 | $ 138,033
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 188 | 67
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 8,937 | $ 5,284
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 488,380 | $ 414,405
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 208 | 160
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 226 | $ 1,855
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 41,527 | $ 197,621
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 10 | 66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 5,758 | $ 847
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 244,550 | $ 56,998
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 106 | 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 5,984 | $ 2,702
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 286,077 | $ 254,619
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 116 | 91
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 59 | $ 773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 13,732 | $ 65,726
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 3 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 2,273 | $ 1,125
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 92,532 | $ 49,986
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 49 | 32
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 2,332 | $ 1,898
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 106,264 | $ 115,712
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 52 | 52
U.S. government agency securities |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 0 | $ 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 0 | $ 1,484
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 97 | $ 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 7,402 | $ 5,930
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 3 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 97 | $ 85
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 7,402 | $ 7,414
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 3 | 3
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 29 | $ 48
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 8,196 | $ 11,541
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 5 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 488 | $ 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 65,644 | $ 2,737
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 30 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 517 | $ 69
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 73,840 | $ 14,278
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 35 | 8
U.S. treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss | $ 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value | $ 14,797 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security | 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss | $ 7 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value | $ 14,797 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security | 2 |
Mutual funds |  |
Summary of Investment Holdings [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Loss |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Estimated Fair Value |  | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Gross Unrealized Loss |  | $ 530
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Estimated Fair Value |  | $ 22,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security |  | 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Gross Unrealized Loss |  | $ 530
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value |  | $ 22,382
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Security |  | 6

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