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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 327,224	$ 323,809	$ 308,700
Unrealized Gains	1,414	578	194
Unrealized Losses	(3,362)	(6,971)	(8,055)
Fair Value (Estimated)	325,276	317,416	300,839
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000	5,000
Unrealized Gains	16	7
Unrealized Losses	0	0
Fair Value (Estimated)	5,016	5,007
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	317,269	313,854	302,935
Unrealized Gains	1,394	571	191
Unrealized Losses	(3,240)	(6,732)	(7,798)
Fair Value (Estimated)	315,423	307,693	295,328
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955	4,955	5,765
Unrealized Gains	4	0	3
Unrealized Losses	(122)	(239)	(257)
Fair Value (Estimated)	$ 4,837	$ 4,716	$ 5,511

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 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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Amount 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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