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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 914,649 | $ 749,458
Gross Unrealized Gain | 332 | 4,729
Gross Unrealized Loss | (7,985) | (406)
Estimated Fair Value | 906,996 | 753,781
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,948 | 9,997
Gross Unrealized Gain |  | 135
Gross Unrealized Loss | (3) |
Estimated Fair Value | 4,945 | 10,132
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 641,256 | 515,169
Gross Unrealized Gain | 138 | 4,260
Gross Unrealized Loss | (5,332) | (188)
Estimated Fair Value | 636,062 | 519,241
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 100,244 | 133,632
Gross Unrealized Gain | 190 | 186
Gross Unrealized Loss | (551) | (217)
Estimated Fair Value | 99,883 | 133,601
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 99,015 | 90,660
Gross Unrealized Gain | 4 | 148
Gross Unrealized Loss | (583) | (1)
Estimated Fair Value | 98,436 | 90,807
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 840,515 | 739,461
Gross Unrealized Gain | 332 | 4,594
Gross Unrealized Loss | (6,466) | (406)
Estimated Fair Value | 834,381 | $ 743,649
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 69,186 |
Gross Unrealized Loss | (1,516) |
Estimated Fair Value | $ 67,670 |

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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=123581744&loc=d3e27161-111563 + Details
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