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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 242,354	$ 201,660
Gross unrealized gains	2,948	73
Gross unrealized losses	(83)	(550)
Fair value	245,219	201,183
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	10,000
Gross unrealized gains	28
Gross unrealized losses	0
Fair value	10,028
Negotiable certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,000	15,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	5,000	15,000
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	10,000	19,723
Gross unrealized gains	27	6
Gross unrealized losses	0	(36)
Fair value	10,027	19,693
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	162,582	87,156
Gross unrealized gains	2,600	53
Gross unrealized losses	(82)	(396)
Fair value	165,100	86,813
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	352	507
Gross unrealized gains	4	0
Gross unrealized losses	(1)	(24)
Fair value	355	483
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	54,420	79,274
Gross unrealized gains	289	14
Gross unrealized losses	0	(94)
Fair value	$ 54,709	$ 79,194

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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