Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities Available for Sale:
Amortized cost	$ 355,253	$ 346,874
Gross Unrealized Gains	8,992	2,716
Gross Unrealized Losses	(644)	(2,258)
Investment securities available for sale, at fair value	363,601	347,332
U.S. treasury securities
Securities Available for Sale:
Amortized cost	245
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Investment securities available for sale, at fair value	245
State, county & municipal securities
Securities Available for Sale:
Amortized cost	38,494	5,133
Gross Unrealized Gains	571	36
Gross Unrealized Losses	(159)	(54)
Investment securities available for sale, at fair value	38,906	5,115
Corporate Debt securities
Securities Available for Sale:
Amortized cost	3,750	2,811
Gross Unrealized Gains	3	11
Gross Unrealized Losses	0	(16)
Investment securities available for sale, at fair value	3,753	2,806
Mortgage-backed securities
Securities Available for Sale:
Amortized cost	312,764	338,930
Gross Unrealized Gains	8,418	2,669
Gross Unrealized Losses	(485)	(2,188)
Investment securities available for sale, at fair value	$ 320,697	$ 339,411

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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