Securities - Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value	$ 55,293	$ 69,271
Less Than 12 Months, Unrealized Losses	(460)	(679)
12 Months or Greater, Fair Value	35,524	93,822
12 Months or Greater, Unrealized Losses	(590)	(3,106)
Fair Value	90,817	163,093
Unrealized Losses	$ (1,050)	$ (3,785)
Number of debt securities with unrealized losses | security	110	195
Percentage of aggregate depreciation from amortized cost basis	1.10%	2.30%
U.S. Treasury Securities
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value		$ 14,866
Less Than 12 Months, Unrealized Losses		(19)
Fair Value		14,866
Unrealized Losses		(19)
Municipal Bonds
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value	$ 2,760	15,405
Less Than 12 Months, Unrealized Losses	(23)	(199)
12 Months or Greater, Fair Value	1,390	34,172
12 Months or Greater, Unrealized Losses	(13)	(916)
Fair Value	4,150	49,577
Unrealized Losses	(36)	(1,115)
Mortgage-Backed Securities
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value	32,276	1,751
Less Than 12 Months, Unrealized Losses	(242)	(21)
12 Months or Greater, Fair Value	3,098	41,776
12 Months or Greater, Unrealized Losses	(39)	(1,671)
Fair Value	35,374	43,527
Unrealized Losses	(281)	(1,692)
Corporate Securities
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value	8,350	9,063
Less Than 12 Months, Unrealized Losses	(131)	(74)
12 Months or Greater, Fair Value		1,996
12 Months or Greater, Unrealized Losses		(50)
Fair Value	8,350	11,059
Unrealized Losses	(131)	(124)
SBA Securities
Fair value and gross unrealized losses of securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less Than 12 Months, Fair Value	11,907	28,186
Less Than 12 Months, Unrealized Losses	(64)	(366)
12 Months or Greater, Fair Value	31,036	15,878
12 Months or Greater, Unrealized Losses	(538)	(469)
Fair Value	42,943	44,064
Unrealized Losses	$ (602)	$ (835)