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Investment Securities - Summary of Unrealized Loss Positions (Details) $ in Thousands | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
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Investments in an unrealized loss position |  |
Amortized cost | $ 427,128 | $ 421,272
Amount of pretax loss if securities in an unrealized loss position are sold | 49,800 |
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | 108,486 | 203,065
Less than 12 months, unrealized loss | (10,446) | (3,437)
12 months or more, fair value | 212,317 | 36,616
12 months or more, unrealized loss | (39,353) | (1,202)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings |  |
Investments in an unrealized loss position |  |
Amortized cost | 91,300 | 244,600
United States government agency securities |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 51,436 | $ 41,105
Description and number of positions |  |
Number of investments in an unrealized loss position, AFS | loan | 32 | 21
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 21,287 | $ 5,101
Less than 12 months, unrealized loss | (1,937) | (77)
12 months or more, fair value | 19,423 | 21,770
12 months or more, unrealized loss | (4,700) | (819)
United States sponsored mortgage-backed securities |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 68,267 | $ 77,519
Description and number of positions |  |
Number of investments in an unrealized loss position, AFS | loan | 51 | 30
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 6,953 | $ 55,354
Less than 12 months, unrealized loss | (852) | (1,346)
12 months or more, fair value | 49,618 | 7,845
12 months or more, unrealized loss | (10,844) | (287)
United States treasury securities |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 130,689 | $ 112,133
Description and number of positions |  |
Number of investments in an unrealized loss position, AFS | loan | 29 | 24
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 11,936 | $ 110,389
Less than 12 months, unrealized loss | (130) | (1,744)
12 months or more, fair value | 102,092 | 0
12 months or more, unrealized loss | $ (9,698) | $ 0
Municipal securities |  |
Description and number of positions |  |
Number of investments in an unrealized loss position, AFS | loan | 173 | 53
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 65,930 | $ 32,221
Less than 12 months, unrealized loss | (7,507) | (270)
12 months or more, fair value | 41,184 | 7,001
12 months or more, unrealized loss | (14,111) | (96)
Corporate debt securities |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 10,570 | $ 11,093
Description and number of positions |  |
Number of investments in an unrealized loss position, AFS | loan | 3 | 9
Investments in an Unrealized Loss Position |  |
Less than 12 months, fair value | $ 2,380 | $ 0
Less than 12 months, unrealized loss | (20) | 0
12 months or more, fair value | 0 | 0
12 months or more, unrealized loss | $ 0 | $ 0

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