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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 957,272 | $ 978,796
Gross Unrealized Gain |  | 63
Gross Unrealized Loss | (140,030) | (125,021)
Estimated Fair Value | 817,242 | 853,838
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 72,561 | 49,690
Gross Unrealized Loss | (1,639) | (1,664)
Estimated Fair Value | 70,922 | 48,026
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 507,922 | 540,590
Gross Unrealized Gain |  | 63
Gross Unrealized Loss | (85,196) | (75,501)
Estimated Fair Value | 422,726 | 465,152
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 60,407 | 61,799
Gross Unrealized Loss | (14,441) | (10,507)
Estimated Fair Value | 45,966 | 51,292
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 98,595 | 98,236
Gross Unrealized Loss | (12,337) | (12,751)
Estimated Fair Value | 86,258 | 85,485
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 140,409 | 150,338
Gross Unrealized Loss | (10,490) | (11,839)
Estimated Fair Value | 129,919 | 138,499
Total U.S. government agency and sponsored agency obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 807,333 | 850,963
Gross Unrealized Gain |  | 63
Gross Unrealized Loss | (122,464) | (110,598)
Estimated Fair Value | 684,869 | 740,428
Municipal bonds-tax exempt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 77,378 | 78,143
Gross Unrealized Loss | (15,927) | (12,759)
Estimated Fair Value | $ 61,451 | $ 65,384

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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