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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 967,383 | $ 922,654
Gross Unrealized Gain | 0 | 177
Gross Unrealized Loss | (137,232) | (12,041)
Estimated Fair Value | 830,151 | 910,790
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,876 | 15,457
Gross Unrealized Gain |  | 1
Gross Unrealized Loss | (1,716) | (61)
Estimated Fair Value | 33,160 | 15,397
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 615,335 | 615,393
Gross Unrealized Gain |  | 18
Gross Unrealized Loss | (92,965) | (7,906)
Estimated Fair Value | 522,370 | 607,505
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,872 | 95,153
Gross Unrealized Gain |  | 41
Gross Unrealized Loss | (12,466) | (1,590)
Estimated Fair Value | 86,406 | 93,604
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 139,904 | 117,499
Gross Unrealized Loss | (12,270) | (1,603)
Estimated Fair Value | 127,634 | 115,896
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 854,111 | 828,045
Gross Unrealized Gain | 0 | 59
Gross Unrealized Loss | (117,701) | (11,099)
Estimated Fair Value | 736,410 | 817,005
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 78,396 | 79,152
Gross Unrealized Gain |  | 117
Gross Unrealized Loss | (17,815) | (881)
Estimated Fair Value | $ 60,581 | $ 78,388

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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