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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 304,740	$ 307,036	$ 302,513
Unrealized Gains	4,542	7,272	9,250
Unrealized Losses	(3,035)	(932)	(263)
Fair Value (Estimated)	306,247	313,376	311,500
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	23,045	15,500
Unrealized Gains	0	0	68
Unrealized Losses	(848)	(315)	(12)
Fair Value (Estimated)	22,197	22,730	15,556
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	245,187	238,516	267,805
Unrealized Gains	3,264	5,507	7,937
Unrealized Losses	(2,161)	(617)	(251)
Fair Value (Estimated)	246,290	243,406	275,491
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,544	37,752	19,208
Unrealized Gains	1,170	1,722	1,245
Unrealized Losses	(26)	0	0
Fair Value (Estimated)	32,688	39,474	$ 20,453
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,964	7,723
Unrealized Gains	108	43
Unrealized Losses	0	0
Fair Value (Estimated)	$ 5,072	$ 7,766

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 326
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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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