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Securities - Estimated Fair Value and Unrealized Loss for Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 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 | $ 429,651 | $ 450,421
Total securities, Less than 12 months, Unrealized Losses | (8,820) | (3,806)
Total securities, 12 months or longer, Estimated Fair Value | 431,471 | 261,254
Total securities, 12 months or longer, Unrealized Losses | (19,340) | (9,358)
Total securities, Estimated Fair Value | 861,122 | 711,675
Total securities, Unrealized Losses | (28,160) | (13,164)
Held-to-Maturity Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 371,257 | 381,046
Held-to-maturity, Less than 12 months, Unrealized Losses | (8,134) | (3,310)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 389,850 | 249,048
Held-to-maturity, 12 months or longer, Unrealized Losses | (18,438) | (9,057)
Held-to-maturity, Total, Estimated Fair Value | 761,107 | 630,094
Held-to-maturity, Total, Unrealized Losses | (26,572) | (12,367)
Held-to-Maturity Securities | Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 67,517 | 123,821
Held-to-maturity, Less than 12 months, Unrealized Losses | (941) | (1,248)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 114,030 | 70,469
Held-to-maturity, 12 months or longer, Unrealized Losses | (5,171) | (4,254)
Held-to-maturity, Total, Estimated Fair Value | 181,547 | 194,290
Held-to-maturity, Total, Unrealized Losses | (6,112) | (5,502)
Held-to-Maturity Securities | Investment Securities | Other investments |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 4,903 | 4,035
Held-to-maturity, Less than 12 months, Unrealized Losses | (68) | (30)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 41,583 | 56,106
Held-to-maturity, 12 months or longer, Unrealized Losses | (2,967) | (3,932)
Held-to-maturity, Total, Estimated Fair Value | 46,486 | 60,141
Held-to-maturity, Total, Unrealized Losses | (3,035) | (3,962)
U.S. Agency Obligations | Held-to-Maturity Securities | Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value |  | 14,903
Held-to-maturity, Less than 12 months, Unrealized Losses |  | (65)
Held-to-maturity, 12 months or longer, Estimated Fair Value |  | 0
Held-to-maturity, 12 months or longer, Unrealized Losses |  | 0
Held-to-maturity, Total, Estimated Fair Value |  | 14,903
Held-to-maturity, Total, Unrealized Losses |  | (65)
Mortgage-Backed Securities | Held-to-Maturity Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 303,740 | 257,225
Held-to-maturity, Less than 12 months, Unrealized Losses | (7,193) | (2,062)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 275,820 | 178,579
Held-to-maturity, 12 months or longer, Unrealized Losses | (13,267) | (4,803)
Held-to-maturity, Total, Estimated Fair Value | 579,560 | 435,804
Held-to-maturity, Total, Unrealized Losses | (20,460) | (6,865)
Mortgage-Backed Securities | Held-to-Maturity Securities | FHLMC |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 125,973 | 98,138
Held-to-maturity, Less than 12 months, Unrealized Losses | (2,463) | (781)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 112,290 | 68,238
Held-to-maturity, 12 months or longer, Unrealized Losses | (5,663) | (2,156)
Held-to-maturity, Total, Estimated Fair Value | 238,263 | 166,376
Held-to-maturity, Total, Unrealized Losses | (8,126) | (2,937)
Mortgage-Backed Securities | Held-to-Maturity Securities | FNMA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 120,922 | 132,982
Held-to-maturity, Less than 12 months, Unrealized Losses | (3,594) | (1,058)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 112,293 | 65,060
Held-to-maturity, 12 months or longer, Unrealized Losses | (5,788) | (1,942)
Held-to-maturity, Total, Estimated Fair Value | 233,215 | 198,042
Held-to-maturity, Total, Unrealized Losses | (9,382) | (3,000)
Mortgage-Backed Securities | Held-to-Maturity Securities | GNMA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 52,813 | 26,105
Held-to-maturity, Less than 12 months, Unrealized Losses | (1,042) | (223)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 51,237 | 45,281
Held-to-maturity, 12 months or longer, Unrealized Losses | (1,816) | (705)
Held-to-maturity, Total, Estimated Fair Value | 104,050 | 71,386
Held-to-maturity, Total, Unrealized Losses | (2,858) | (928)
Mortgage-Backed Securities | Held-to-Maturity Securities | SBA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 4,032 |
Held-to-maturity, Less than 12 months, Unrealized Losses | (94) |
Held-to-maturity, 12 months or longer, Estimated Fair Value | 0 |
Held-to-maturity, 12 months or longer, Unrealized Losses | 0 |
Held-to-maturity, Total, Estimated Fair Value | 4,032 |
Held-to-maturity, Total, Unrealized Losses | (94) | 0
State and Municipal Obligations | Held-to-Maturity Securities | Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 9,835 |
Held-to-maturity, Less than 12 months, Unrealized Losses | (129) |
Held-to-maturity, 12 months or longer, Estimated Fair Value | 4,947 |
Held-to-maturity, 12 months or longer, Unrealized Losses | (63) |
Held-to-maturity, Total, Estimated Fair Value | 14,782 |
Held-to-maturity, Total, Unrealized Losses | (192) |
Corporate Debt Securities | Held-to-Maturity Securities | Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 52,779 | 104,883
Held-to-maturity, Less than 12 months, Unrealized Losses | (744) | (1,153)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 67,500 | 14,363
Held-to-maturity, 12 months or longer, Unrealized Losses | (2,141) | (322)
Held-to-maturity, Total, Estimated Fair Value | 120,279 | 119,246
Held-to-maturity, Total, Unrealized Losses | (2,885) | (1,475)
Investment Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 58,394 |
Held-to-maturity, Less than 12 months, Unrealized Losses | (686) |
Held-to-maturity, 12 months or longer, Estimated Fair Value | 41,621 |
Held-to-maturity, 12 months or longer, Unrealized Losses | (902) |
Held-to-maturity, Total, Estimated Fair Value | 100,015 |
Held-to-maturity, Total, Unrealized Losses | (1,588) |
Investment Securities | U.S. Agency Obligations |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 57,252 | 69,375
Held-to-maturity, Less than 12 months, Unrealized Losses | (675) | (496)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 41,621 | 12,206
Held-to-maturity, 12 months or longer, Unrealized Losses | (902) | (301)
Held-to-maturity, Total, Estimated Fair Value | 98,873 | 81,581
Held-to-maturity, Total, Unrealized Losses | (1,577) | $ (797)
Investment Securities | Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Held-to-maturity, Less than 12 months, Estimated Fair Value | 1,142 |
Held-to-maturity, Less than 12 months, Unrealized Losses | (11) |
Held-to-maturity, 12 months or longer, Estimated Fair Value | 0 |
Held-to-maturity, 12 months or longer, Unrealized Losses | 0 |
Held-to-maturity, Total, Estimated Fair Value | 1,142 |
Held-to-maturity, Total, Unrealized Losses | $ (11) |

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