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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Securities Financing Transaction [Line Items] |  |
Debt securities available-for-sale, fair value | $ 100,717 | $ 81,581
Debt Securites, Held-to-maturity, Amortized Cost | 851,903 | 772,060
Debt Securites, Held-to-maturity, Estimated Fair Value | 832,815 | 761,660
Total, Amortized Cost | 953,425 | 854,438
Total, Gross Unrealized Gains | 1,466 | 1,967
Total, Gross Unrealized Losses | (21,359) | (13,164)
Total, Estimated Fair Value | 933,532 | 843,241
Corporate Debt Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 48,021 |
Debt Securites, Held-to-maturity, Estimated Fair Value | 43,059 |
Held-to-Maturity Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 851,903 | 772,060
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 1,303 | 1,967
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (20,391) | (12,367)
Debt Securites, Held-to-maturity, Estimated Fair Value | 832,815 | 761,660
Held-to-Maturity Securities | Mortgage-Backed Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 646,107 | 531,110
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 1,110 | 1,436
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (13,580) | (6,865)
Debt Securites, Held-to-maturity, Estimated Fair Value | 633,637 | 525,681
Held-to-Maturity Securities | Mortgage-Backed Securities | FHLMC |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 237,703 | 186,921
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 159 | 151
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (5,110) | (2,937)
Debt Securites, Held-to-maturity, Estimated Fair Value | 232,752 | 184,135
Held-to-Maturity Securities | Mortgage-Backed Securities | Mortgage-backed securities - FNMA |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 277,266 | 263,103
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 753 | 1,193
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (6,030) | (3,000)
Debt Securites, Held-to-maturity, Estimated Fair Value | 271,989 | 261,296
Held-to-Maturity Securities | Mortgage-Backed Securities | GNMA |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 127,611 | 75,243
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 198 | 64
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (2,360) | (928)
Debt Securites, Held-to-maturity, Estimated Fair Value | 125,449 | 74,379
Held-to-Maturity Securities | Mortgage-Backed Securities | SBA |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 3,527 | 5,843
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 0 | 28
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (80) | 0
Debt Securites, Held-to-maturity, Estimated Fair Value | 3,447 | 5,871
Investment Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Available-for-sale, Amortized Cost | 101,522 |
Debt Securites, Available-for-sale, Gross Unrealized Gains | 163 |
Debt Securites, Available-for-sale, Gross Unrealized Loss | (968) |
Debt securities available-for-sale, fair value | 100,717 |
Investment Securities | U.S. Agency Obligations |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Available-for-sale, Amortized Cost | 100,524 | 82,378
Debt Securites, Available-for-sale, Gross Unrealized Gains | 163 | 0
Debt Securites, Available-for-sale, Gross Unrealized Loss | (963) | (797)
Debt securities available-for-sale, fair value | 99,724 | 81,581
Investment Securities | Other investments |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Available-for-sale, Amortized Cost | 998 |
Debt Securites, Available-for-sale, Gross Unrealized Gains | 0 |
Debt Securites, Available-for-sale, Gross Unrealized Loss | (5) |
Debt securities available-for-sale, fair value | 993 |
Investment Securities | Held-to-Maturity Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 205,796 | 240,950
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 193 | 531
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (6,811) | (5,502)
Debt Securites, Held-to-maturity, Estimated Fair Value | 199,178 | 235,979
Investment Securities | Held-to-Maturity Securities | U.S. Agency Obligations |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 14,975 | 14,968
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 0 | 0
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (130) | (65)
Debt Securites, Held-to-maturity, Estimated Fair Value | 14,845 | 14,903
Investment Securities | Held-to-Maturity Securities | State and Municipal Obligations |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 123,987 | 149,958
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 67 | 219
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (1,697) | (1,475)
Debt Securites, Held-to-maturity, Estimated Fair Value | 122,357 | 148,702
Investment Securities | Held-to-Maturity Securities | Corporate Debt Securities |  |
Securities Financing Transaction [Line Items] |  |
Debt Securites, Held-to-maturity, Amortized Cost | 66,834 | 76,024
Debt Securites, Held-to-maturity, Gross Unrealized Gains | 126 | 312
Debt Securites, Held-to-maturity, Gross Unrealized Losses | (4,984) | (3,962)
Debt Securites, Held-to-maturity, Estimated Fair Value | $ 61,976 | $ 72,374

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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