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Current Expected Credit Losses - Available-for-Sale Debt Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | $ 10,886 | $ 8,594
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (231) | (18)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value |  | 136
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses |  | (2)
Total Fair Value | 10,886 | 8,730
Total Unrealized Losses | (231) | (20)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 4,166 | 203
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (87) |
Total Fair Value | 4,166 | 203
Total Unrealized Losses | (87) |
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value |  | 930
Total Fair Value |  | 930
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 3,901 | 797
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (76) | (3)
Total Fair Value | 3,901 | 797
Total Unrealized Losses | (76) | (3)
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 1,577 | 2,594
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (62) | (6)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value |  | 136
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses |  | (2)
Total Fair Value | 1,577 | 2,730
Total Unrealized Losses | (62) | (8)
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 1,242 | 4,070
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (6) | (9)
Total Fair Value | 1,242 | 4,070
Total Unrealized Losses | $ (6) | $ (9)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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