Securities - Summary Comparison of Securities by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available for sale:
Total available for sale securities	$ 430,255	$ 337,184
Gross Unrealized Gains	9,646	3,352
Gross Unrealized Losses	(5,975)	(599)
Securities, available for sale	433,926	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	15,000	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities, available for sale	15,000	0
U.S. Government Agencies
Available for sale:
Total available for sale securities	241	16,380
Gross Unrealized Gains	2	15
Gross Unrealized Losses	0	(2)
Securities, available for sale	243	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	163,368	94,561
Gross Unrealized Gains	1,378	1,110
Gross Unrealized Losses	(5,823)	(302)
Securities, available for sale	158,923	95,369
Municipal bonds
Available for sale:
Total available for sale securities	31,974	30,297
Gross Unrealized Gains	2,261	1,870
Gross Unrealized Losses	(9)	(14)
Securities, available for sale	34,226	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	13,752	16,400
Gross Unrealized Gains	155	40
Gross Unrealized Losses	(134)	(43)
Securities, available for sale	13,773	16,397
Mortgage-backed securities
Available for sale:
Total available for sale securities	205,920	179,546
Gross Unrealized Gains	5,850	317
Gross Unrealized Losses	(9)	(238)
Securities, available for sale	211,761	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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