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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 749,458 | $ 629,725
Gross Unrealized Gain | 4,729 | 5,553
Gross Unrealized Loss | (406) | (801)
Estimated Fair Value | 753,781 | 634,477
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,997 | 34,946
Gross Unrealized Gain | 135 | 259
Estimated Fair Value | 10,132 | 35,206
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 515,169 | 406,813
Gross Unrealized Gain | 4,260 | 4,334
Gross Unrealized Loss | (188) | (347)
Estimated Fair Value | 519,241 | 410,801
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 133,632 | 164,232
Gross Unrealized Gain | 186 | 792
Gross Unrealized Loss | (217) | (432)
Estimated Fair Value | 133,601 | 164,592
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 90,660 | 23,733
Gross Unrealized Gain | 148 | 168
Gross Unrealized Loss | (1) | (22)
Estimated Fair Value | 90,807 | 23,878
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 739,461 | 594,778
Gross Unrealized Gain | 4,594 | 5,294
Gross Unrealized Loss | (406) | (801)
Estimated Fair Value | $ 743,649 | $ 599,271

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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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