Securities - Summary Comparison of Securities by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available for sale:
Total available for sale securities	$ 401,844	$ 337,184
Gross Unrealized Gains	15,208	3,352
Gross Unrealized Losses	(733)	(599)
Securities, available for sale	416,319	339,937
Held to maturity:
Amortized Cost	0	86,579
Gross Unrealized Gains	0	382
Gross Unrealized Losses	0	(144)
Fair Value	0	86,817
U.S. Treasuries
Available for sale:
Total available for sale securities	43,700	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities, available for sale	43,700	0
U.S. Government Agencies
Available for sale:
Total available for sale securities	0	16,380
Gross Unrealized Gains	0	15
Gross Unrealized Losses	0	(2)
Securities, available for sale	0	16,393
Held to maturity:
Amortized Cost	0	18,175
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(32)
Fair Value	0	18,143
Corporate debt securities
Available for sale:
Total available for sale securities	186,515	94,561
Gross Unrealized Gains	9,458	1,110
Gross Unrealized Losses	(723)	(302)
Securities, available for sale	195,250	95,369
Municipal bonds
Available for sale:
Total available for sale securities	30,863	30,297
Gross Unrealized Gains	1,651	1,870
Gross Unrealized Losses	(3)	(14)
Securities, available for sale	32,511	32,153
Held to maturity:
Amortized Cost	0	5,107
Gross Unrealized Gains	0	182
Gross Unrealized Losses	0	0
Fair Value	0	5,289
Collateralized mortgage obligations
Available for sale:
Total available for sale securities	5,428	16,400
Gross Unrealized Gains	136	40
Gross Unrealized Losses	(4)	(43)
Securities, available for sale	5,560	16,397
Mortgage-backed securities
Available for sale:
Total available for sale securities	135,338	179,546
Gross Unrealized Gains	3,963	317
Gross Unrealized Losses	(3)	(238)
Securities, available for sale	139,298	179,625
Held to maturity:
Amortized Cost	0	63,297
Gross Unrealized Gains	0	200
Gross Unrealized Losses	0	(112)
Fair Value	$ 0	$ 63,385

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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