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Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 1,067,874 | $ 965,135
Gross unrealized gains | 33,795 | 12,932
Gross unrealized losses | (1,278) | (1,148)
Available for sale debt securities, at fair value | 1,100,391 | 976,919
Mortgage-Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 903,628 | 936,196
Gross unrealized gains | 31,407 | 12,367
Gross unrealized losses | (864) | (1,133)
Available for sale debt securities, at fair value | 934,171 | 947,430
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 53,018 |
Gross unrealized gains | 877 |
Gross unrealized losses | (27) |
Available for sale debt securities, at fair value | 53,868 |
State And Municipal Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 69,931 | 3,907
Gross unrealized gains | 918 | 172
Gross unrealized losses | (331) | 0
Available for sale debt securities, at fair value | 70,518 | 4,079
Corporate Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 40,216 | 25,032
Gross unrealized gains | 589 | 393
Gross unrealized losses | (55) | (15)
Available for sale debt securities, at fair value | 40,750 | $ 25,410
Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 957,700 |
Available for sale debt securities, at fair value | $ 989,100 |

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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