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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | $ 125,901 | $ 101,522
Available-for-sale, Gross Unrealized Gains | 1,526 | 163
Available-for-sale, Gross Unrealized Losses | (119) | (968)
Available-for-sale, Estimated Fair Value | 127,308 | 100,717
Held-to-maturity, Amortized Cost | 823,717 | 851,903
Held-to-maturity, Gross Unrealized Gains | 8,192 | 1,303
Held-to-maturity, Gross Unrealized Losses | (4,945) | (20,391)
Estimated Fair Value | 826,964 | 832,815
Total, Amortized Cost | 949,618 | 953,425
Total, Gross Unrealized Gains | 9,718 | 1,466
Total, Gross Unrealized Losses | (5,064) | (21,359)
Total, Estimated Fair Value | 954,272 | 933,532
Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 125,300 |
Available-for-sale, Gross Unrealized Gains | 1,521 |
Available-for-sale, Gross Unrealized Losses | (119) |
Available-for-sale, Estimated Fair Value | 126,702 |
Held-to-maturity, Amortized Cost | 225,840 | 205,796
Held-to-maturity, Gross Unrealized Gains | 2,164 | 193
Held-to-maturity, Gross Unrealized Losses | (3,630) | (6,811)
Estimated Fair Value | 224,374 | 199,178
U.S. government and agency obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 124,050 | 100,524
Available-for-sale, Gross Unrealized Gains | 1,520 | 163
Available-for-sale, Gross Unrealized Losses | (119) | (963)
Available-for-sale, Estimated Fair Value | 125,451 | 99,724
Held-to-maturity, Amortized Cost | 9,981 | 14,975
Held-to-maturity, Gross Unrealized Gains | 2 | 0
Held-to-maturity, Gross Unrealized Losses | (2) | (130)
Estimated Fair Value | 9,981 | 14,845
State and municipal obligations | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 1,250 |
Available-for-sale, Gross Unrealized Gains | 1 |
Available-for-sale, Gross Unrealized Losses | 0 |
Available-for-sale, Estimated Fair Value | 1,251 |
Held-to-maturity, Amortized Cost | 134,626 | 123,987
Held-to-maturity, Gross Unrealized Gains | 1,247 | 67
Held-to-maturity, Gross Unrealized Losses | (259) | (1,697)
Estimated Fair Value | 135,614 | 122,357
Corporate debt securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 46,029 |
Estimated Fair Value | 42,660 |
Corporate debt securities | Investment securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 81,233 | 66,834
Held-to-maturity, Gross Unrealized Gains | 915 | 126
Held-to-maturity, Gross Unrealized Losses | (3,369) | (4,984)
Estimated Fair Value | 78,779 | 61,976
Mortgage-backed securities |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 597,877 | 646,107
Held-to-maturity, Gross Unrealized Gains | 6,028 | 1,110
Held-to-maturity, Gross Unrealized Losses | (1,315) | (13,580)
Estimated Fair Value | 602,590 | 633,637
Mortgage-backed securities | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 219,047 | 237,703
Held-to-maturity, Gross Unrealized Gains | 2,194 | 159
Held-to-maturity, Gross Unrealized Losses | (569) | (5,110)
Estimated Fair Value | 220,672 | 232,752
Mortgage-backed securities | FNMA |  |
Securities Financing Transaction [Line Items] |  |
Available-for-sale, Amortized Cost | 601 | 998
Available-for-sale, Gross Unrealized Gains | 5 | 0
Available-for-sale, Gross Unrealized Losses | 0 | (5)
Available-for-sale, Estimated Fair Value | 606 | 993
Held-to-maturity, Amortized Cost | 259,192 | 277,266
Held-to-maturity, Gross Unrealized Gains | 2,566 | 753
Held-to-maturity, Gross Unrealized Losses | (503) | (6,030)
Estimated Fair Value | 261,255 | 271,989
Mortgage-backed securities | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 116,730 | 127,611
Held-to-maturity, Gross Unrealized Gains | 1,268 | 198
Held-to-maturity, Gross Unrealized Losses | (169) | (2,360)
Estimated Fair Value | 117,829 | 125,449
Mortgage-backed securities | SBA |  |
Securities Financing Transaction [Line Items] |  |
Held-to-maturity, Amortized Cost | 2,908 | 3,527
Held-to-maturity, Gross Unrealized Gains | 0 | 0
Held-to-maturity, Gross Unrealized Losses | (74) | (80)
Estimated Fair Value | $ 2,834 | $ 3,447

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