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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, 2021 | Dec. 31, 2020
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Securities to be held to maturity |  |
Amortized Cost | $ 370,040 | $ 365,613
Unrealized Gains | 8,599 | 11,739
Unrealized Losses | (3,312) | (218)
Fair Value (Estimated) | 375,327 | 377,134
Restricted equity securities |  |
Federal Home Loan Bank Stock | 4,328 | 9,508
Federal Reserve Bank Stock | 1,037 | 1,037
Restricted equity securities | 5,365 | 10,545
U.S. Government-sponsored agencies |  |
Securities to be held to maturity |  |
Amortized Cost | 35,600 | 44,149
Unrealized Gains | 2 | 143
Unrealized Losses | (1,149) | (18)
Fair Value (Estimated) | 34,453 | 44,274
Mortgage-backed securities |  |
Securities to be held to maturity |  |
Amortized Cost | 60,646 | 53,594
Unrealized Gains | 261 | 736
Unrealized Losses | (1,795) | (195)
Fair Value (Estimated) | 59,112 | 54,135
State and political subdivisions |  |
Securities to be held to maturity |  |
Amortized Cost | 250,544 | 245,620
Unrealized Gains | 7,925 | 10,427
Unrealized Losses | (302) | (3)
Fair Value (Estimated) | 258,167 | 256,044
Corporate securities |  |
Securities to be held to maturity |  |
Amortized Cost | 23,250 | 22,250
Unrealized Gains | 411 | 433
Unrealized Losses | (66) | (2)
Fair Value (Estimated) | $ 23,595 | $ 22,681

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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 http://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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