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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 319,088	$ 323,809	$ 311,241
Unrealized Gains	4,275	578	144
Unrealized Losses	(793)	(6,971)	(9,315)
Fair Value (Estimated)	322,570	317,416	302,070
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000	5,000
Unrealized Gains	12	7
Unrealized Losses	0	0
Fair Value (Estimated)	5,012	5,007
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	309,133	313,854	306,286
Unrealized Gains	4,249	571	144
Unrealized Losses	(757)	(6,732)	(9,052)
Fair Value (Estimated)	312,625	307,693	297,378
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955	4,955	4,955
Unrealized Gains	14	0	0
Unrealized Losses	(36)	(239)	(263)
Fair Value (Estimated)	$ 4,933	$ 4,716	$ 4,692

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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