Investment Securities (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amortized cost
Amortized Cost	$ 202,929	$ 102,392
Estimated fair value
Total	214,257	103,046
Investment securities	$ 214,257	$ 103,046
Available-for-sale Securities, Other Disclosure Items
Federal tax rate (percent)	21.00%	21.00%	35.00%
Customer repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	$ 3,500	$ 4,800
Residential mortgage-backed securities
Amortized cost
Less Than One Year	0	3
After One Through Five Years	1,005	1,573
After Five Through Ten Years	0	0
After Ten Years	3,986	5,298
Amortized Cost	4,991	6,874
Estimated fair value
Less Than One Year	0	4
After One Through Five Years	1,088	1,668
After Five Through Ten Years	0	0
After Ten Years	4,178	5,570
Investment securities	$ 5,266	$ 7,242
Weighted average yield
Less Than One Year	0.00%	6.50%
After One Through Five Years	5.54%	5.54%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	4.31%	4.53%
Total	4.55%	4.76%
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	183,225	95,518
Amortized Cost	183,225	95,518
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	197,027	95,804
Investment securities	$ 197,027	$ 95,804
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%	4.25%
Total	4.20%	4.25%
CRT Securities
Amortized cost
Less Than One Year	$ 0
After One Through Five Years	0
After Five Through Ten Years	0
After Ten Years	14,713
Amortized Cost	14,713
Estimated fair value
Less Than One Year	0
After One Through Five Years	0
After Five Through Ten Years	0
After Ten Years	11,964
Investment securities	$ 11,964
Weighted average yield
Less Than One Year	0.00%
After One Through Five Years	0.00%
After Five Through Ten Years	0.00%
After Ten Years	1.71%
Total	1.71%
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits	$ 1,200	$ 1,700