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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value |  | $ 274,950
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss |  | (4,845)
Debt Securities, Available for Sale, 12 Months or more, Fair Value |  | 123,833
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss |  | (2,489)
Debt Securities, Available for Sale, Fair Value |  | 398,783
Debt Securities, Available-for-sale, Unrealized Loss |  | (7,334)
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value | $ 153,086 | 237,463
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss | (2,742) | (4,535)
Debt Securities, Available for Sale, 12 Months or more, Fair Value | 291,893 | 99,981
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss | (13,791) | (2,378)
Debt Securities, Available for Sale, Fair Value | 444,979 | 337,444
Debt Securities, Available-for-sale, Unrealized Loss | $ (16,533) | (6,913)
Obligations of U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value |  | 36,709
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss |  | (309)
Debt Securities, Available for Sale, 12 Months or more, Fair Value |  | 23,852
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss |  | (111)
Debt Securities, Available for Sale, Fair Value |  | 60,561
Debt Securities, Available-for-sale, Unrealized Loss |  | (420)
Debt Securities Held to Maturity, Less than 12 months, Fair Value |  | 18,813
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss |  | (142)
Debt Securities Held to Maturity, 12 months or more, Fair Value |  | 62,952
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss |  | (338)
Debt Securities Held to Maturity, Fair Value |  | 81,765
Debt Securities Held to Maturity, Unrealized Loss |  | (480)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available for Sale, Less than 12 Months, Fair Value |  | 778
Debt Securities, Available for Sale, Less than 12 Months, Unrealized Loss |  | (1)
Debt Securities, Available for Sale, 12 Months or more, Fair Value |  | 0
Debt Securities, Available for Sale, 12 Months or more, Unrealized Loss |  | 0
Debt Securities, Available for Sale, Fair Value |  | 778
Debt Securities, Available-for-sale, Unrealized Loss |  | $ (1)

X
- 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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- 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 less 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 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 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 less 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 + Details
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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 unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 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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