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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | $ 385,352 | $ 365,613 | $ 341,592
Unrealized Gains | 8,317 | 11,739 | 8,008
Unrealized Losses | (4,833) | (218) | (352)
Fair Value (Estimated) | 388,836 | 377,134 | 349,248
Equity Securities, Restricted [Abstract] |  |  |
Federal Home Loan Bank Stock | 9,068 | 9,508 | 8,957
Federal Reserve Bank Stock | 1,037 | 1,037 | 1,037
Restricted equity securities | 10,105 | 10,545 | 9,994
U.S. Government-sponsored agencies |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 35,600 | 44,149 | 35,981
Unrealized Gains | 55 | 143 | 207
Unrealized Losses | (2,041) | (18) | 0
Fair Value (Estimated) | 33,614 | 44,274 | 36,188
Mortgage-backed securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 76,365 | 53,594 | 51,142
Unrealized Gains | 480 | 736 | 1,392
Unrealized Losses | (2,181) | (195) | (7)
Fair Value (Estimated) | 74,664 | 54,135 | 52,527
State and political subdivisions |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 251,137 | 245,620 | 239,719
Unrealized Gains | 7,435 | 10,427 | 5,819
Unrealized Losses | (525) | (3) | (345)
Fair Value (Estimated) | 258,047 | 256,044 | 245,193
Corporate securities |  |  |
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |  |
Amortized Cost | 22,250 | 22,250 | 14,750
Unrealized Gains | 347 | 433 | 590
Unrealized Losses | (86) | (2) | 0
Fair Value (Estimated) | $ 22,511 | $ 22,681 | $ 15,340

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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=75031641&loc=d3e63345-112809 + Details
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