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Investment Securities - Summary of Unrealized Loss Positions (Details) $ in Thousands | Sep. 30, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
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Investments in an unrealized loss position |  |
Amortized Cost | $ 416,217 | $ 421,272
Amount of pretax loss if securities in an unrealized loss position are sold | 52,400 |
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | 135,643 | 203,065
Less than 12 months, unrealized loss | (22,453) | (3,437)
12 months or more, fair value | 187,891 | 36,616
12 months or more, unrealized loss | (29,902) | (1,202)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings |  |
Investments in an unrealized loss position |  |
Amortized Cost | 27,500 | 244,600
United States government agency securities |  |
Investments in an unrealized loss position |  |
Amortized Cost | $ 52,276 | $ 41,105
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 31 | 21
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 22,001 | $ 5,101
Less than 12 months, unrealized loss | (1,818) | (77)
12 months or more, fair value | 19,638 | 21,770
12 months or more, unrealized loss | (4,330) | (819)
United States sponsored mortgage-backed securities |  |
Investments in an unrealized loss position |  |
Amortized Cost | $ 69,708 | $ 77,519
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 51 | 30
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 15,078 | $ 55,354
Less than 12 months, unrealized loss | (2,437) | (1,346)
12 months or more, fair value | 42,750 | 7,845
12 months or more, unrealized loss | (9,442) | (287)
United States treasury securities |  |
Investments in an unrealized loss position |  |
Amortized Cost | $ 121,479 | $ 112,133
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 28 | 24
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 9,507 | $ 110,389
Less than 12 months, unrealized loss | (95) | (1,744)
12 months or more, fair value | 101,525 | 0
12 months or more, unrealized loss | $ (10,352) | $ 0
Municipal securities |  |
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 214 | 53
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 86,671 | $ 32,221
Less than 12 months, unrealized loss | (18,089) | (270)
12 months or more, fair value | 23,978 | 7,001
12 months or more, unrealized loss | (5,778) | (96)
Corporate debt securities |  |
Investments in an unrealized loss position |  |
Amortized Cost | $ 7,654 | $ 11,093
Description and Number of Positions |  |
Number of investments in an unrealized loss position | loan | 3 |
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 2,386 |
Less than 12 months, unrealized loss | (14) |
12 months or more, fair value | 0 |
12 months or more, unrealized loss | $ 0 |

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