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Securities - Summary of Debt Securities Available for Sale in an Unrealized Loss Position for Which an Allowance for Credit Losses Has Not Been Recorded (Detail) $ in Thousands | Sep. 30, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,208) | $ (4,324)
Available-for-Sale Within One Year, Estimated Fair Value | $ 94,381 | $ 129,210
Available-for-Sale Within One Year, Number of Securities | Security | 33 | 49
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (138,823) | $ (120,697)
Available-for-Sale More than One Year, Estimated Fair Value | $ 722,861 | $ 719,787
Available-for-Sale More than One Year, Number of Securities | Security | 211 | 184
Available-for-Sale, Gross Unrealized Loss | $ (140,030) | $ (125,021)
Available-for-Sale, Estimated Fair Value | $ 817,242 | $ 848,997
Available-for-Sale, Number of Securities | Security | 244 | 233
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (212) | $ (414)
Available-for-Sale Within One Year, Estimated Fair Value | $ 42,415 | $ 33,812
Available-for-Sale Within One Year, Number of Securities | Security | 15 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (1,427) | $ (1,250)
Available-for-Sale More than One Year, Estimated Fair Value | $ 28,507 | $ 14,215
Available-for-Sale More than One Year, Number of Securities | Security | 10 | 4
Available-for-Sale, Gross Unrealized Loss | $ (1,639) | $ (1,664)
Available-for-Sale, Estimated Fair Value | $ 70,922 | $ 48,027
Available-for-Sale, Number of Securities | Security | 25 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (533) | $ (1,712)
Available-for-Sale Within One Year, Estimated Fair Value | $ 19,097 | $ 36,009
Available-for-Sale Within One Year, Number of Securities | Security | 9 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (84,663) | $ (73,789)
Available-for-Sale More than One Year, Estimated Fair Value | $ 403,629 | $ 424,302
Available-for-Sale More than One Year, Number of Securities | Security | 118 | 105
Available-for-Sale, Gross Unrealized Loss | $ (85,196) | $ (75,501)
Available-for-Sale, Estimated Fair Value | $ 422,726 | $ 460,311
Available-for-Sale, Number of Securities | Security | 127 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (84)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 4,069
Available-for-Sale Within One Year, Number of Securities | Security |  | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (14,441) | $ (10,423)
Available-for-Sale More than One Year, Estimated Fair Value | $ 45,966 | $ 47,221
Available-for-Sale More than One Year, Number of Securities | Security | 15 | 14
Available-for-Sale, Gross Unrealized Loss | $ (14,441) | $ (10,507)
Available-for-Sale, Estimated Fair Value | $ 45,966 | $ 51,290
Available-for-Sale, Number of Securities | Security | 15 | 15
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (405) | $ (1,011)
Available-for-Sale Within One Year, Estimated Fair Value | $ 22,488 | $ 23,606
Available-for-Sale Within One Year, Number of Securities | Security | 6 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,933) | $ (11,740)
Available-for-Sale More than One Year, Estimated Fair Value | $ 63,770 | $ 61,879
Available-for-Sale More than One Year, Number of Securities | Security | 24 | 20
Available-for-Sale, Gross Unrealized Loss | $ (12,337) | $ (12,751)
Available-for-Sale, Estimated Fair Value | $ 86,258 | $ 85,485
Available-for-Sale, Number of Securities | Security | 30 | 28
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (58) | $ (1,103)
Available-for-Sale Within One Year, Estimated Fair Value | $ 10,381 | $ 31,714
Available-for-Sale Within One Year, Number of Securities | Security | 3 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,432) | $ (10,736)
Available-for-Sale More than One Year, Estimated Fair Value | $ 119,538 | $ 106,785
Available-for-Sale More than One Year, Number of Securities | Security | 25 | 22
Available-for-Sale, Gross Unrealized Loss | $ (10,490) | $ (11,839)
Available-for-Sale, Estimated Fair Value | $ 129,919 | $ 138,499
Available-for-Sale, Number of Securities | Security | 28 | 30
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (996) | $ (3,910)
Available-for-Sale Within One Year, Estimated Fair Value | $ 51,966 | $ 95,398
Available-for-Sale Within One Year, Number of Securities | Security | 18 | 35
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (121,469) | $ (106,688)
Available-for-Sale More than One Year, Estimated Fair Value | $ 632,903 | $ 640,187
Available-for-Sale More than One Year, Number of Securities | Security | 182 | 161
Available-for-Sale, Gross Unrealized Loss | $ (122,464) | $ (110,598)
Available-for-Sale, Estimated Fair Value | $ 684,869 | $ 735,585
Available-for-Sale, Number of Securities | Security | 200 | 196
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (15,927) | $ (12,759)
Available-for-Sale More than One Year, Estimated Fair Value | $ 61,451 | $ 65,385
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (15,927) | $ (12,759)
Available-for-Sale, Estimated Fair Value | $ 61,451 | $ 65,385
Available-for-Sale, Number of Securities | Security | 19 | 19

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