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v3.23.1

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 | Mar. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
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Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (1,758) | $ (4,324)
Available-for-Sale Within One Year, Estimated Fair Value | $ 91,619 | $ 129,210
Available-for-Sale Within One Year, Number of Securities | Security | 37 | 49
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (109,893) | $ (120,697)
Available-for-Sale More than One Year, Estimated Fair Value | $ 747,911 | $ 719,787
Available-for-Sale More than One Year, Number of Securities | Security | 194 | 184
Available-for-Sale, Gross Unrealized Loss | $ (111,651) | $ (125,021)
Available-for-Sale, Estimated Fair Value | $ 839,530 | $ 848,997
Available-for-Sale, Number of Securities | Security | 231 | 233
U.S. Treasury securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (186) | $ (414)
Available-for-Sale Within One Year, Estimated Fair Value | $ 24,606 | $ 33,812
Available-for-Sale Within One Year, Number of Securities | Security | 11 | 14
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (1,141) | $ (1,250)
Available-for-Sale More than One Year, Estimated Fair Value | $ 17,823 | $ 14,215
Available-for-Sale More than One Year, Number of Securities | Security | 5 | 4
Available-for-Sale, Gross Unrealized Loss | $ (1,327) | $ (1,664)
Available-for-Sale, Estimated Fair Value | $ 42,429 | $ 48,027
Available-for-Sale, Number of Securities | Security | 16 | 18
Mortgage-backed securities - residential |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (989) | $ (1,712)
Available-for-Sale Within One Year, Estimated Fair Value | $ 30,094 | $ 36,009
Available-for-Sale Within One Year, Number of Securities | Security | 16 | 18
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (67,175) | $ (73,789)
Available-for-Sale More than One Year, Estimated Fair Value | $ 422,817 | $ 424,302
Available-for-Sale More than One Year, Number of Securities | Security | 107 | 105
Available-for-Sale, Gross Unrealized Loss | $ (68,164) | $ (75,501)
Available-for-Sale, Estimated Fair Value | $ 452,911 | $ 460,311
Available-for-Sale, Number of Securities | Security | 123 | 123
Mortgage-backed securities - commercial |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (65) | $ (84)
Available-for-Sale Within One Year, Estimated Fair Value | $ 4,094 | $ 4,069
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (10,558) | $ (10,423)
Available-for-Sale More than One Year, Estimated Fair Value | $ 46,772 | $ 47,221
Available-for-Sale More than One Year, Number of Securities | Security | 14 | 14
Available-for-Sale, Gross Unrealized Loss | $ (10,623) | $ (10,507)
Available-for-Sale, Estimated Fair Value | $ 50,866 | $ 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 | $ (426) | $ (1,011)
Available-for-Sale Within One Year, Estimated Fair Value | $ 18,991 | $ 23,606
Available-for-Sale Within One Year, Number of Securities | Security | 5 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (11,118) | $ (11,740)
Available-for-Sale More than One Year, Estimated Fair Value | $ 66,075 | $ 61,879
Available-for-Sale More than One Year, Number of Securities | Security | 23 | 20
Available-for-Sale, Gross Unrealized Loss | $ (11,544) | $ (12,751)
Available-for-Sale, Estimated Fair Value | $ 85,066 | $ 85,485
Available-for-Sale, Number of Securities | Security | 28 | 28
Debt securities |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ (92) | $ (1,103)
Available-for-Sale Within One Year, Estimated Fair Value | $ 13,834 | $ 31,714
Available-for-Sale Within One Year, Number of Securities | Security | 4 | 8
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,902) | $ (10,736)
Available-for-Sale More than One Year, Estimated Fair Value | $ 126,534 | $ 106,785
Available-for-Sale More than One Year, Number of Securities | Security | 26 | 22
Available-for-Sale, Gross Unrealized Loss | $ (9,994) | $ (11,839)
Available-for-Sale, Estimated Fair Value | $ 140,368 | $ 138,499
Available-for-Sale, Number of Securities | Security | 30 | 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 | $ (1,572) | $ (3,910)
Available-for-Sale Within One Year, Estimated Fair Value | $ 67,013 | $ 95,398
Available-for-Sale Within One Year, Number of Securities | Security | 26 | 35
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (98,753) | $ (106,688)
Available-for-Sale More than One Year, Estimated Fair Value | $ 662,198 | $ 640,187
Available-for-Sale More than One Year, Number of Securities | Security | 170 | 161
Available-for-Sale, Gross Unrealized Loss | $ (100,325) | $ (110,598)
Available-for-Sale, Estimated Fair Value | $ 729,211 | $ 735,585
Available-for-Sale, Number of Securities | Security | 196 | 196
Municipal bonds-tax exempt |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale More than One Year, Gross Unrealized Loss | $ (9,999) | $ (12,759)
Available-for-Sale More than One Year, Estimated Fair Value | $ 67,890 | $ 65,385
Available-for-Sale More than One Year, Number of Securities | Security | 19 | 19
Available-for-Sale, Gross Unrealized Loss | $ (9,999) | $ (12,759)
Available-for-Sale, Estimated Fair Value | $ 67,890 | $ 65,385
Available-for-Sale, Number of Securities | Security | 19 | 19

X
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