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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Securities to be held to maturity |  |
Amortized Cost | $ 393,896 | $ 370,040
Unrealized Gains | 200 | 8,599
Unrealized Losses | (55,085) | (3,312)
Fair Value (Estimated) | 339,011 | 375,327
Restricted equity securities |  |
Federal Home Loan Bank Stock | 2,846 | 4,328
Federal Reserve Bank Stock | 1,037 | 1,037
Restricted equity securities | 3,883 | 5,365
U.S. Government-sponsored agencies |  |
Securities to be held to maturity |  |
Amortized Cost | 40,100 | 35,600
Unrealized Gains | 4 | 2
Unrealized Losses | (10,477) | (1,149)
Fair Value (Estimated) | 29,627 | 34,453
Mortgage-backed securities |  |
Securities to be held to maturity |  |
Amortized Cost | 60,497 | 60,646
Unrealized Gains | 42 | 261
Unrealized Losses | (11,392) | (1,795)
Fair Value (Estimated) | 49,147 | 59,112
State and political subdivisions |  |
Securities to be held to maturity |  |
Amortized Cost | 258,549 | 250,544
Unrealized Gains | 154 | 7,925
Unrealized Losses | (30,733) | (302)
Fair Value (Estimated) | 227,970 | 258,167
Corporate securities |  |
Securities to be held to maturity |  |
Amortized Cost | 34,750 | 23,250
Unrealized Gains | 0 | 411
Unrealized Losses | (2,483) | (66)
Fair Value (Estimated) | $ 32,267 | $ 23,595

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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