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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 322,133	$ 323,809	$ 313,748
Unrealized Gains	5,355	578	77
Unrealized Losses	(690)	(6,971)	(11,638)
Fair Value (Estimated)	326,798	317,416	302,187
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		5,000	5,000
Unrealized Gains		7	0
Unrealized Losses		0	(21)
Fair Value (Estimated)		5,007	4,979
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	317,553	313,854	303,793
Unrealized Gains	5,327	571	77
Unrealized Losses	(690)	(6,732)	(11,300)
Fair Value (Estimated)	322,190	307,693	292,570
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,580	4,955	4,955
Unrealized Gains	28	0	0
Unrealized Losses	0	(239)	(317)
Fair Value (Estimated)	$ 4,608	$ 4,716	$ 4,638

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).

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