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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, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less thank 12 months, Estimated Fair Value | $ 5,011 | $ 1,978
Available-for-sale, Less than 12 Months, Unrealized Losses | (9) | (8)
Available-for-sale, 12 months or longer, Estimated Fair Value | 32,363 | 66,438
Available-for-sale, 12 months or longer, Unrealized Losses | (110) | (960)
Available-for-sale, Total, Estimated Fair Value | 37,374 | 68,416
Available-for-sale, Total, Unrealized Losses | (119) | (968)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 71,394 | 118,203
Held-to-maturity, Less than 12 months, Unrealized Losses | (190) | (924)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 178,710 | 556,536
Held-to-maturity, 12 months or longer, Unrealized Losses | (4,755) | (19,467)
Held-to-maturity, Total, Estimated Fair Value | 250,104 | 674,739
Held-to-maturity, Total, Unrealized Losses | (4,945) | (20,391)
Total securities, Less than 12 months, Estimated Fair Value | 76,405 | 120,181
Total securities, Less than 12 months, Unrealized Losses | (199) | (932)
Total securities, 12 months or longer, Estimated Fair Value | 211,073 | 622,974
Total securities, 12 months or longer, Unrealized Losses | (4,865) | (20,427)
Total securities, Estimated Fair Value | 287,478 | 743,155
Total securities, Unrealized Losses | (5,064) | (21,359)
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 | 22,526 | 5,326
Held-to-maturity, Less than 12 months, Unrealized Losses | (71) | (25)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 66,007 | 163,977
Held-to-maturity, 12 months or longer, Unrealized Losses | (3,559) | (6,786)
Held-to-maturity, Total, Estimated Fair Value | 88,533 | 169,303
Held-to-maturity, Total, Unrealized Losses | (3,630) | (6,811)
U.S. government and agency obligations | Investment securities |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less thank 12 months, Estimated Fair Value | 5,011 | 985
Available-for-sale, Less than 12 Months, Unrealized Losses | (9) | (3)
Available-for-sale, 12 months or longer, Estimated Fair Value | 32,363 | 66,438
Available-for-sale, 12 months or longer, Unrealized Losses | (110) | (960)
Available-for-sale, Total, Estimated Fair Value | 37,374 | 67,423
Available-for-sale, Total, Unrealized Losses | (119) | (963)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 0 | 0
Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | 0
Held-to-maturity, 12 months or longer, Estimated Fair Value | 4,999 | 14,845
Held-to-maturity, 12 months or longer, Unrealized Losses | (2) | (130)
Held-to-maturity, Total, Estimated Fair Value | 4,999 | 14,845
Held-to-maturity, Total, Unrealized Losses | (2) | (130)
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 | 48,868 | 112,877
Held-to-maturity, Less than 12 months, Unrealized Losses | (119) | (899)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 112,703 | 392,559
Held-to-maturity, 12 months or longer, Unrealized Losses | (1,196) | (12,681)
Held-to-maturity, Total, Estimated Fair Value | 161,571 | 505,436
Held-to-maturity, Total, Unrealized Losses | (1,315) | (13,580)
Mortgage-backed 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 | 13,132 | 46,615
Held-to-maturity, Less than 12 months, Unrealized Losses | (32) | (159)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 41,799 | 147,763
Held-to-maturity, 12 months or longer, Unrealized Losses | (537) | (4,951)
Held-to-maturity, Total, Estimated Fair Value | 54,931 | 194,378
Held-to-maturity, Total, Unrealized Losses | (569) | (5,110)
Mortgage-backed securities | FNMA |  |
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items] |  |
Available-for-sale, Less thank 12 months, Estimated Fair Value |  | 993
Available-for-sale, Less than 12 Months, Unrealized Losses |  | (5)
Available-for-sale, 12 months or longer, Estimated Fair Value |  | 0
Available-for-sale, 12 months or longer, Unrealized Losses |  | 0
Available-for-sale, Total, Estimated Fair Value |  | 993
Available-for-sale, Total, Unrealized Losses |  | (5)
Held-to-maturity, Less than 12 months, Estimated Fair Value | 13,475 | 27,594
Held-to-maturity, Less than 12 months, Unrealized Losses | (31) | (125)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 43,134 | 185,328
Held-to-maturity, 12 months or longer, Unrealized Losses | (472) | (5,905)
Held-to-maturity, Total, Estimated Fair Value | 56,609 | 212,922
Held-to-maturity, Total, Unrealized Losses | (503) | (6,030)
Mortgage-backed 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 | 22,261 | 35,221
Held-to-maturity, Less than 12 months, Unrealized Losses | (56) | (535)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 24,936 | 59,468
Held-to-maturity, 12 months or longer, Unrealized Losses | (113) | (1,825)
Held-to-maturity, Total, Estimated Fair Value | 47,197 | 94,689
Held-to-maturity, Total, Unrealized Losses | (169) | (2,360)
Mortgage-backed 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 | 0 | 3,447
Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | (80)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 2,834 | 0
Held-to-maturity, 12 months or longer, Unrealized Losses | (74) | 0
Held-to-maturity, Total, Estimated Fair Value | 2,834 | 3,447
Held-to-maturity, Total, Unrealized Losses | (74) | (80)
State and municipal obligations | 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 | 22,526 | 2,856
Held-to-maturity, Less than 12 months, Unrealized Losses | (71) | (4)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 18,348 | 106,073
Held-to-maturity, 12 months or longer, Unrealized Losses | (188) | (1,693)
Held-to-maturity, Total, Estimated Fair Value | 40,874 | 108,929
Held-to-maturity, Total, Unrealized Losses | (259) | (1,697)
Corporate debt 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 | 0 | 2,470
Held-to-maturity, Less than 12 months, Unrealized Losses | 0 | (21)
Held-to-maturity, 12 months or longer, Estimated Fair Value | 42,660 | 43,059
Held-to-maturity, 12 months or longer, Unrealized Losses | (3,369) | (4,963)
Held-to-maturity, Total, Estimated Fair Value | 42,660 | 45,529
Held-to-maturity, Total, Unrealized Losses | $ (3,369) | $ (4,984)

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