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Investment Securities - Continuous Unrealized Loss (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	$ 9,999,000		$ 9,999,000		$ 95,209,000
Unrealized loss, less than 12 months	(26,000)		(26,000)		(223,000)
Fair value, 12 months or more	5,596,000		5,596,000		16,206,000
Unrealized loss, 12 months or more	(57,000)		(57,000)		(327,000)
Total fair value	15,595,000		15,595,000		111,415,000
Total unrealized loss	(83,000)		(83,000)		(550,000)
OTTI Loss, AFS	0	$ 0	0	$ 0
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months					14,937,000
Unrealized loss, less than 12 months					(36,000)
Fair value, 12 months or more					0
Unrealized loss, 12 months or more					0
Total fair value					14,937,000
Total unrealized loss					(36,000)
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	9,999,000		9,999,000		28,939,000
Unrealized loss, less than 12 months	(26,000)		(26,000)		(103,000)
Fair value, 12 months or more	5,472,000		5,472,000		8,743,000
Unrealized loss, 12 months or more	(56,000)		(56,000)		(293,000)
Total fair value	15,471,000		15,471,000		37,682,000
Total unrealized loss	(82,000)		(82,000)		(396,000)
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months	0		0		353,000
Unrealized loss, less than 12 months	0		0		(14,000)
Fair value, 12 months or more	124,000		124,000		130,000
Unrealized loss, 12 months or more	(1,000)		(1,000)		(10,000)
Total fair value	124,000		124,000		483,000
Total unrealized loss	$ (1,000)		$ (1,000)		(24,000)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair value, less than 12 months					50,980,000
Unrealized loss, less than 12 months					(70,000)
Fair value, 12 months or more					7,333,000
Unrealized loss, 12 months or more					(24,000)
Total fair value					58,313,000
Total unrealized loss					$ (94,000)