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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 | Jun. 30, 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 | $ (60,732) | $ (9,953)
Available-for-Sale Within One Year, Estimated Fair Value | $ 611,420 | $ 800,439
Available-for-Sale Within One Year, Number of Securities | Security | 150 | 158
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (34,431) | $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value | $ 243,682 | $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security | 59 | 15
Available-for-Sale, Gross Unrealized Loss | $ (95,163) | $ (12,041)
Available-for-Sale, Estimated Fair Value | $ 855,102 | $ 877,344
Available-for-Sale, Number of Securities | Security | 209 | 173
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,009) | $ (61)
Available-for-Sale Within One Year, Estimated Fair Value | $ 22,940 | $ 8,391
Available-for-Sale Within One Year, Number of Securities | Security | 8 | 2
Available-for-Sale, Gross Unrealized Loss | $ (1,009) | $ (61)
Available-for-Sale, Estimated Fair Value | $ 22,940 | $ 8,391
Available-for-Sale, Number of Securities | Security | 8 | 2
Mortgage-backed securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (40,268) | $ (6,252)
Available-for-Sale Within One Year, Estimated Fair Value | $ 381,684 | $ 535,610
Available-for-Sale Within One Year, Number of Securities | Security | 89 | 102
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (23,062) | $ (1,654)
Available-for-Sale More than One Year, Estimated Fair Value | $ 166,953 | $ 59,457
Available-for-Sale More than One Year, Number of Securities | Security | 39 | 11
Available-for-Sale, Gross Unrealized Loss | $ (63,330) | $ (7,906)
Available-for-Sale, Estimated Fair Value | $ 548,637 | $ 595,067
Available-for-Sale, Number of Securities | Security | 128 | 113
Collateralized mortgage obligations |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (5,762) | $ (1,256)
Available-for-Sale Within One Year, Estimated Fair Value | $ 71,244 | $ 76,894
Available-for-Sale Within One Year, Number of Securities | Security | 22 | 16
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (2,822) | $ (334)
Available-for-Sale More than One Year, Estimated Fair Value | $ 19,485 | $ 12,548
Available-for-Sale More than One Year, Number of Securities | Security | 6 | 3
Available-for-Sale, Gross Unrealized Loss | $ (8,584) | $ (1,590)
Available-for-Sale, Estimated Fair Value | $ 90,729 | $ 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 | $ (6,276) | $ (1,503)
Available-for-Sale Within One Year, Estimated Fair Value | $ 98,611 | $ 110,996
Available-for-Sale Within One Year, Number of Securities | Security | 20 | 21
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (2,277) | $ (100)
Available-for-Sale More than One Year, Estimated Fair Value | $ 29,223 | $ 4,900
Available-for-Sale More than One Year, Number of Securities | Security | 6 | 1
Available-for-Sale, Gross Unrealized Loss | $ (8,553) | $ (1,603)
Available-for-Sale, Estimated Fair Value | $ 127,834 | $ 115,896
Available-for-Sale, Number of Securities | Security | 26 | 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 | $ (52,306) | $ (9,011)
Available-for-Sale Within One Year, Estimated Fair Value | $ 551,539 | $ 723,500
Available-for-Sale Within One Year, Number of Securities | Security | 131 | 139
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (28,161) | $ (2,088)
Available-for-Sale More than One Year, Estimated Fair Value | $ 215,661 | $ 76,905
Available-for-Sale More than One Year, Number of Securities | Security | 51 | 15
Available-for-Sale, Gross Unrealized Loss | $ (80,467) | $ (11,099)
Available-for-Sale, Estimated Fair Value | $ 767,200 | $ 800,405
Available-for-Sale, Number of Securities | Security | 182 | 154
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (7,417) | $ (881)
Available-for-Sale Within One Year, Estimated Fair Value | $ 36,941 | $ 68,548
Available-for-Sale Within One Year, Number of Securities | Security | 11 | 17
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (6,270) |
Available-for-Sale More than One Year, Estimated Fair Value | $ 28,021 |
Available-for-Sale More than One Year, Number of Securities | Security | 8 |
Available-for-Sale, Gross Unrealized Loss | $ (13,687) | $ (881)
Available-for-Sale, Estimated Fair Value | $ 64,962 | $ 68,548
Available-for-Sale, Number of Securities | Security | 19 | 17

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