Investment Securities (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Amortized cost
Amortized Cost	$ 198,141	$ 202,929
Estimated fair value
Total	204,177	214,257
Investment securities	204,177	214,257
Weighted average yield
Debt Securities, Available-for-sale, Amortized Cost	$ 198,141	202,929
Available-for-sale Securities, Other Disclosure Items
Federal tax rate (percent)	21.00%
Customer repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	$ 3,100	3,500
Residential mortgage-backed securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	888	1,005
After Five Through Ten Years	0	0
After Ten Years	3,668	3,986
Amortized Cost	4,556	4,991
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	968	1,088
After Five Through Ten Years	0	0
After Ten Years	3,720	4,178
Investment securities	$ 4,688	$ 5,266
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	5.54%	5.54%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	4.22%	4.31%
Total	4.48%	4.55%
Debt Securities, Available-for-sale, Amortized Cost	$ 4,556	$ 4,991
Tax-exempt asset-backed securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	178,872	183,225
Amortized Cost	178,872	183,225
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	191,474	197,027
Investment securities	$ 191,474	$ 197,027
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	0.00%	0.00%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	4.20%	4.20%
Total	4.20%	4.20%
Debt Securities, Available-for-sale, Amortized Cost	$ 178,872	$ 183,225
Credit risk transfer securities
Amortized cost
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	14,713	14,713
Amortized Cost	14,713	14,713
Estimated fair value
Less Than One Year	0	0
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	8,015	11,964
Investment securities	$ 8,015	$ 11,964
Weighted average yield
Less Than One Year	0.00%	0.00%
After One Through Five Years	0.00%	0.00%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	1.63%	1.71%
Total	1.63%	1.71%
Debt Securities, Available-for-sale, Amortized Cost	$ 14,713	$ 14,713
Less Than 12 Months, Fair Value	0	11,964
Less Than 12 Months, Unrealized Loss	0	(2,749)
12 Months or Longer, Fair Value	8,015	0
12 Months or Longer, Unrealized Loss	(6,698)	0
Total, Fair Value	8,015	11,964
Total, Unrealized Loss	(6,698)	(2,749)
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	$ 1,500	$ 1,200