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Investment Securities - Summary of Unrealized Loss Positions (Details) | Sep. 30, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan
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Investments in an unrealized loss position |  |
Amount of pretax loss if securities in an unrealized loss position are sold | $ 50,500,000 |
Allowance for credit losses, continuous unrealized loss position | 0 |
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | 14,612,000 | $ 108,486,000
Less than 12 months, unrealized loss | (4,020,000) | (10,446,000)
12 months or more, fair value | 264,302,000 | 212,317,000
12 months or more, unrealized loss | (46,498,000) | (39,353,000)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 215,600,000 | $ 91,300,000
United States government agency securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 25 | 32
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 356,000 | $ 21,287,000
Less than 12 months, unrealized loss | 0 | (1,937,000)
12 months or more, fair value | 35,155,000 | 19,423,000
12 months or more, unrealized loss | $ (7,228,000) | $ (4,700,000)
United States sponsored mortgage-backed securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 48 | 51
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 2,249,000 | $ 6,953,000
Less than 12 months, unrealized loss | (90,000) | (852,000)
12 months or more, fair value | 48,493,000 | 49,618,000
12 months or more, unrealized loss | $ (13,340,000) | $ (10,844,000)
United States treasury securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 23 | 29
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 0 | $ 11,936,000
Less than 12 months, unrealized loss | 0 | (130,000)
12 months or more, fair value | 98,100,000 | 102,092,000
12 months or more, unrealized loss | $ (8,376,000) | $ (9,698,000)
Municipal securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 196 | 173
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 10,036,000 | $ 65,930,000
Less than 12 months, unrealized loss | (3,828,000) | (7,507,000)
12 months or more, fair value | 80,624,000 | 41,184,000
12 months or more, unrealized loss | $ (17,484,000) | $ (14,111,000)
Corporate debt securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 7 | 3
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 1,971,000 | $ 2,380,000
Less than 12 months, unrealized loss | (102,000) | (20,000)
12 months or more, fair value | 1,930,000 | 0
12 months or more, unrealized loss | $ (70,000) | $ 0

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