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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 | Dec. 31, 2022 USD ($) Security | Dec. 31, 2021 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (4,324) | $ (9,953)
Available-for-Sale Within One Year, Estimated Fair Value | $ 129,210 | $ 800,439
Available-for-Sale Within One Year, Number of Securities | Security | 49 | 158
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (120,697) | $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value | $ 719,787 | $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security | 184 | 15
Available-for-Sale, Gross Unrealized Loss | $ (125,021) | $ (12,041)
Available-for-Sale, Estimated Fair Value | $ 848,997 | $ 877,344
Available-for-Sale, Number of Securities | Security | 233 | 173
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (414) | $ (61)
Available-for-Sale Within One Year, Estimated Fair Value | $ 33,812 | $ 8,391
Available-for-Sale Within One Year, Number of Securities | Security | 14 | 2
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (1,250) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 14,215 |
Available-for-Sale More than One Year, Number of Securities | Security | 4 |
Available-for-Sale, Gross Unrealized Loss | $ (1,664) | $ (61)
Available-for-Sale, Estimated Fair Value | $ 48,027 | $ 8,391
Available-for-Sale, Number of Securities | Security | 18 | 2
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,712) | $ (5,484)
Available-for-Sale Within One Year, Estimated Fair Value | $ 36,009 | $ 498,731
Available-for-Sale Within One Year, Number of Securities | Security | 18 | 92
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (73,789) | $ (965)
Available-for-Sale More than One Year, Estimated Fair Value | $ 424,302 | $ 41,236
Available-for-Sale More than One Year, Number of Securities | Security | 105 | 8
Available-for-Sale, Gross Unrealized Loss | $ (75,501) | $ (6,449)
Available-for-Sale, Estimated Fair Value | $ 460,311 | $ 539,967
Available-for-Sale, Number of Securities | Security | 123 | 100
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (84) | $ (768)
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,069 | $ 36,879
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 10
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,423) | $ (689)
Available-for-Sale More than One Year, Estimated Fair Value | $ 47,221 | $ 18,221
Available-for-Sale More than One Year, Number of Securities | Security | 14 | 3
Available-for-Sale, Gross Unrealized Loss | $ (10,507) | $ (1,457)
Available-for-Sale, Estimated Fair Value | $ 51,290 | $ 55,100
Available-for-Sale, Number of Securities | Security | 15 | 13
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,011) | $ (1,256)
Available-for-Sale Within One Year, Estimated Fair Value | $ 23,606 | $ 76,894
Available-for-Sale Within One Year, Number of Securities | Security | 8 | 16
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,740) | $ (334)
Available-for-Sale More than One Year, Estimated Fair Value | $ 61,879 | $ 12,548
Available-for-Sale More than One Year, Number of Securities | Security | 20 | 3
Available-for-Sale, Gross Unrealized Loss | $ (12,751) | $ (1,590)
Available-for-Sale, Estimated Fair Value | $ 85,485 | $ 89,442
Available-for-Sale, Number of Securities | Security | 28 | 19
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,103) | $ (1,503)
Available-for-Sale Within One Year, Estimated Fair Value | $ 31,714 | $ 110,996
Available-for-Sale Within One Year, Number of Securities | Security | 8 | 21
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,736) | $ (100)
Available-for-Sale More than One Year, Estimated Fair Value | $ 106,785 | $ 4,900
Available-for-Sale More than One Year, Number of Securities | Security | 22 | 1
Available-for-Sale, Gross Unrealized Loss | $ (11,839) | $ (1,603)
Available-for-Sale, Estimated Fair Value | $ 138,499 | $ 115,896
Available-for-Sale, Number of Securities | Security | 30 | 22
Total U.S. government agency and sponsored agency obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (3,910) | $ (9,011)
Available-for-Sale Within One Year, Estimated Fair Value | $ 95,398 | $ 723,500
Available-for-Sale Within One Year, Number of Securities | Security | 35 | 139
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (106,688) | $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value | $ 640,187 | $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security | 161 | 15
Available-for-Sale, Gross Unrealized Loss | $ (110,598) | $ (11,099)
Available-for-Sale, Estimated Fair Value | $ 735,585 | $ 800,405
Available-for-Sale, Number of Securities | Security | 196 | 154
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ (881)
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 68,548
Available-for-Sale Within One Year, Number of Securities | Security |  | 17
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (12,759) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 65,385 |
Available-for-Sale More than One Year, Number of Securities | Security | 19 |
Available-for-Sale, Gross Unrealized Loss | $ (12,759) | $ (881)
Available-for-Sale, Estimated Fair Value | $ 65,385 | $ 68,548
Available-for-Sale, Number of Securities | Security | 19 | 17

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