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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Net Investment Income [Line Items] |  |
Due within one year, Amortized Cost | $ 5,000 |
Due within one year, Estimated Fair Value | 5,058 |
Due after one but within five years, Amortized Cost | 12,871 |
Due after one but within five years, Estimated Fair Value | 13,610 |
Due after five but within ten years, Amortized Cost | 15,864 |
Due after five but within ten years, Estimated Fair Value | 16,440 |
Due after ten years, Amortized Cost | 0 |
Due after ten years, Estimated Fair Value | 0 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 33,735 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 35,108 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 1,045,199 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 1,055,422 |
Amortized Cost | 1,078,934 | $ 805,515
Securities available for sale, at fair value | 1,090,530 | $ 831,223
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 1,078,934 |
Securities available for sale, at fair value | 1,090,530 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 332,500 |
Securities available for sale, at fair value | 336,800 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 712,700 |
Securities available for sale, at fair value | $ 718,600 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 + Details
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