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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Total securities, Less than 12 months, Estimated Fair Value | $ 120,181 | $ 450,421
Total securities, Less than 12 months, Unrealized Losses | (932) | (3,806)
Total securities, 12 months or longer, Estimated Fair Value | 622,974 | 261,254
Total securities, 12 months or longer, Unrealized Losses | (20,427) | (9,358)
Total securities, Estimated Fair Value | 743,155 | 711,675
Total securities, Unrealized Losses | (21,359) | (13,164)
Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Available-for-sale, Less than 12 Months, Estimated Fair Value | 1,978 |
Debt Securites, Available-for-sale, Less than 12 months, Unrealized Losses | (8) |
Debt Securites, Available-for-sale, 12 Months or Longer, Estimated Fair Value | 66,438 |
Debt Securites, Available-for-sale, 12 Months or Longer, Unrealized Losses | (960) |
Debt Securites, Available-for-sale, Total, Estimated Fair Value | 68,416 |
Debt Securites, Available-for-sale, Total, Unrealized Losses | (968) |
Investment Securities | U.S. Agency Obligations |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Available-for-sale, Less than 12 Months, Estimated Fair Value | 985 | 69,375
Debt Securites, Available-for-sale, Less than 12 months, Unrealized Losses | (3) | (496)
Debt Securites, Available-for-sale, 12 Months or Longer, Estimated Fair Value | 66,438 | 12,206
Debt Securites, Available-for-sale, 12 Months or Longer, Unrealized Losses | (960) | (301)
Debt Securites, Available-for-sale, Total, Estimated Fair Value | 67,423 | 81,581
Debt Securites, Available-for-sale, Total, Unrealized Losses | (963) | (797)
Investment Securities | Other investments |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Available-for-sale, Less than 12 Months, Estimated Fair Value | 993 |
Debt Securites, Available-for-sale, Less than 12 months, Unrealized Losses | (5) |
Debt Securites, Available-for-sale, 12 Months or Longer, Estimated Fair Value | 0 |
Debt Securites, Available-for-sale, 12 Months or Longer, Unrealized Losses | 0 |
Debt Securites, Available-for-sale, Total, Estimated Fair Value | 993 |
Debt Securites, Available-for-sale, Total, Unrealized Losses | (5) |
Held-to-Maturity Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 118,203 | 381,046
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (924) | (3,310)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 556,536 | 249,048
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (19,467) | (9,057)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 674,739 | 630,094
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (20,391) | (12,367)
Held-to-Maturity Securities | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 112,877 | 257,225
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (899) | (2,062)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 392,559 | 178,579
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (12,681) | (4,803)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 505,436 | 435,804
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (13,580) | (6,865)
Held-to-Maturity Securities | FHLMC | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 46,615 | 98,138
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (159) | (781)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 147,763 | 68,238
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (4,951) | (2,156)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 194,378 | 166,376
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (5,110) | (2,937)
Held-to-Maturity Securities | Mortgage-backed securities - FNMA | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 27,594 | 132,982
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (125) | (1,058)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 185,328 | 65,060
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (5,905) | (1,942)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 212,922 | 198,042
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (6,030) | (3,000)
Held-to-Maturity Securities | GNMA | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 35,221 | 26,105
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (535) | (223)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 59,468 | 45,281
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (1,825) | (705)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 94,689 | 71,386
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (2,360) | (928)
Held-to-Maturity Securities | SBA | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 3,447 |
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (80) |
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 0 |
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | 0 |
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 3,447 |
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (80) | 0
Held-to-Maturity Securities | Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 5,326 | 123,821
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (25) | (1,248)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 163,977 | 70,469
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (6,786) | (4,254)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 169,303 | 194,290
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (6,811) | (5,502)
Held-to-Maturity Securities | Investment Securities | U.S. Agency Obligations |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 0 | 14,903
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | (65)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 14,845 | 0
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (130) | 0
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 14,845 | 14,903
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (130) | (65)
Held-to-Maturity Securities | Investment Securities | State and Municipal Obligations |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 2,856 | 104,883
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (4) | (1,153)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 106,073 | 14,363
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (1,693) | (322)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 108,929 | 119,246
Debt Securites, Held-to-maturity, Total, Unrealized Losses | (1,697) | (1,475)
Held-to-Maturity Securities | Investment Securities | Corporate Debt Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Debt Securites, Held-to-maturity, Less than 12 months, Estimated Fair Value | 2,470 | 4,035
Debt Securites, Held-to-maturity, Less than 12 months, Unrealized Losses | (21) | (30)
Debt Securites, Held-to-maturity, 12 months or longer, Estimated Fair Value | 43,059 | 56,106
Debt Securites, Held-to-maturity, 12 months or longer, Unrealized Losses | (4,963) | (3,932)
Debt Securites, Held-to-maturity, Total, Estimated Fair Value | 45,529 | 60,141
Debt Securites, Held-to-maturity, Total, Unrealized Losses | $ (4,984) | $ (3,962)

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