Securities - Summary of Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Available for sale
Less Than 12 Months, Number of Securities | security	46	121
Less Than 12 Months, Fair Value	$ 58,565	$ 131,727
Less Than 12 Months, Gross Unrealized Losses	$ (524)	$ (418)
12 Months or More, Number of Securities | security	7	22
12 Months or More, Fair Value	$ 1,693	$ 15,454
12 Months or More, Gross Unrealized Losses	$ (209)	$ (181)
Total, Number of Securities | security	53	143
Total, Fair Value	$ 60,258	$ 147,181
Total, Gross Unrealized Losses	$ (733)	$ (599)
Held to maturity:
Less Than 12 Months, Number of Securities | security	0	9
Less Than 12 Months, Fair Value	$ 0	$ 11,057
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ (60)
12 Months or More, Number of Securities | security	0	19
12 Months or More, Fair Value	$ 0	$ 27,358
12 Months or More, Gross Unrealized Losses	$ 0	$ (84)
Total, Number of Securities | security	0	28
Total, Fair Value	$ 0	$ 38,415
Total, Gross Unrealized Losses	$ 0	$ (144)
U.S. Treasuries
Available for sale
Less Than 12 Months, Number of Securities | security	3	0
Less Than 12 Months, Fair Value	$ 43,700	$ 0
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ 0
12 Months or More, Number of Securities | security	0	0
12 Months or More, Fair Value	$ 0	$ 0
12 Months or More, Gross Unrealized Losses	$ 0	$ 0
Total, Number of Securities | security	3	0
Total, Fair Value	$ 43,700	$ 0
Total, Gross Unrealized Losses	$ 0	$ 0
U.S. Government Agencies
Available for sale
Less Than 12 Months, Number of Securities | security	0	1
Less Than 12 Months, Fair Value	$ 0	$ 4,398
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ (1)
12 Months or More, Number of Securities | security	0	1
12 Months or More, Fair Value	$ 0	$ 149
12 Months or More, Gross Unrealized Losses	$ 0	$ (1)
Total, Number of Securities | security	0	2
Total, Fair Value	$ 0	$ 4,547
Total, Gross Unrealized Losses	$ 0	$ (2)
Held to maturity:
Less Than 12 Months, Number of Securities | security	0	2
Less Than 12 Months, Fair Value	$ 0	$ 2,177
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ (2)
12 Months or More, Number of Securities | security	0	8
12 Months or More, Fair Value	$ 0	$ 15,965
12 Months or More, Gross Unrealized Losses	$ 0	$ (30)
Total, Number of Securities | security	0	10
Total, Fair Value	$ 0	$ 18,142
Total, Gross Unrealized Losses	$ 0	$ (32)
Corporate debt securities
Available for sale
Less Than 12 Months, Number of Securities | security	28	42
Less Than 12 Months, Fair Value	$ 13,741	$ 21,269
Less Than 12 Months, Gross Unrealized Losses	$ (514)	$ (174)
12 Months or More, Number of Securities | security	7	12
12 Months or More, Fair Value	$ 1,693	$ 3,184
12 Months or More, Gross Unrealized Losses	$ (209)	$ (128)
Total, Number of Securities | security	35	54
Total, Fair Value	$ 15,434	$ 24,453
Total, Gross Unrealized Losses	$ (723)	$ (302)
Municipal bonds
Available for sale
Less Than 12 Months, Number of Securities | security	3	9
Less Than 12 Months, Fair Value	$ 198	$ 4,285
Less Than 12 Months, Gross Unrealized Losses	$ (3)	$ (14)
12 Months or More, Number of Securities | security	0	0
12 Months or More, Fair Value	$ 0	$ 0
12 Months or More, Gross Unrealized Losses	$ 0	$ 0
Total, Number of Securities | security	3	9
Total, Fair Value	$ 198	$ 4,285
Total, Gross Unrealized Losses	$ (3)	$ (14)
Held to maturity:
Less Than 12 Months, Number of Securities | security	0	0
Less Than 12 Months, Fair Value	$ 0	$ 0
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ 0
12 Months or More, Number of Securities | security	0	1
12 Months or More, Fair Value	$ 0	$ 50
12 Months or More, Gross Unrealized Losses	$ 0	$ 0
Total, Number of Securities | security	0	1
Total, Fair Value	$ 0	$ 50
Total, Gross Unrealized Losses	$ 0	$ 0
Collateralized mortgage obligations
Available for sale
Less Than 12 Months, Number of Securities | security	3	12
Less Than 12 Months, Fair Value	$ 741	$ 10,022
Less Than 12 Months, Gross Unrealized Losses	$ (4)	$ (43)
12 Months or More, Number of Securities | security	0	0
12 Months or More, Fair Value	$ 0	$ 0
12 Months or More, Gross Unrealized Losses	$ 0	$ 0
Total, Number of Securities | security	3	12
Total, Fair Value	$ 741	$ 10,022
Total, Gross Unrealized Losses	$ (4)	$ (43)
Mortgage-backed securities
Available for sale
Less Than 12 Months, Number of Securities | security	9	57
Less Than 12 Months, Fair Value	$ 185	$ 91,753
Less Than 12 Months, Gross Unrealized Losses	$ (3)	$ (186)
12 Months or More, Number of Securities | security	0	9
12 Months or More, Fair Value	$ 0	$ 12,121
12 Months or More, Gross Unrealized Losses	$ 0	$ (52)
Total, Number of Securities | security	9	66
Total, Fair Value	$ 185	$ 103,874
Total, Gross Unrealized Losses	$ (3)	$ (238)
Held to maturity:
Less Than 12 Months, Number of Securities | security	0	7
Less Than 12 Months, Fair Value	$ 0	$ 8,880
Less Than 12 Months, Gross Unrealized Losses	$ 0	$ (58)
12 Months or More, Number of Securities | security	0	10
12 Months or More, Fair Value	$ 0	$ 11,343
12 Months or More, Gross Unrealized Losses	$ 0	$ (54)
Total, Number of Securities | security	0	17
Total, Fair Value	$ 0	$ 20,223
Total, Gross Unrealized Losses	$ 0	$ (112)