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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, 2020	Dec. 31, 2019
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	$ 365,613	$ 281,606
Unrealized Gains	11,739	5,590
Unrealized Losses	(218)	(151)
Fair Value (Estimated)	377,134	287,045
Restricted equity securities
Federal Home Loan Bank Stock	9,508	7,945
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	10,545	8,982
U.S. government-sponsored agencies
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	44,149	32,840
Unrealized Gains	143	47
Unrealized Losses	(18)	(26)
Fair Value (Estimated)	44,274	32,861
Mortgage-backed securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	53,594	14,431
Unrealized Gains	736	450
Unrealized Losses	(195)	(16)
Fair Value (Estimated)	54,135	14,865
State and political subdivisions
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	245,620	219,585
Unrealized Gains	10,427	4,936
Unrealized Losses	(3)	(109)
Fair Value (Estimated)	256,044	224,412
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	22,250	14,750
Unrealized Gains	433	157
Unrealized Losses	(2)	0
Fair Value (Estimated)	$ 22,681	$ 14,907

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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).

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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