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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 690,118 | $ 557,891
Gross Unrealized Gains | 14,869 | 19,307
Gross Unrealized Losses | (8,634) | 0
Fair Value | 696,353 | 577,198
Equity securities, at fair value | 1,028 | 2,406
Investment securities, at fair value | 712,657 | 595,876
Accrued interest receivable | 40,570 | 38,072
Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest receivable | 4,700 |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159,416 | 273,252
Gross Unrealized Gains | 13,398 | 5,069
Gross Unrealized Losses | 0 | 0
Fair Value | 172,814 | 278,321
Agency-guaranteed collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 153,952 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 153,952 |
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 15,157 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 15,157 |
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,566 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 5,566 |
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 356,027 | 284,639
Gross Unrealized Gains | 1,471 | 14,238
Gross Unrealized Losses | (8,634) | 0
Fair Value | 348,864 | 298,877
Interest-only GNMA securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest-only GNMA securities | $ 15,276 | $ 16,272

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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=118939692&loc=d3e27161-111563 + Details
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