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Allowance for Credit Losses on Loans - Loans Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Jan. 01, 2020	Mar. 31, 2019	Dec. 31, 2018
Loans held-for-investment:
Total loan balance	$ 2,534,163	$ 2,554,169
Deferred loan fees, net	(319)	(258)
Loans, net of deferred fees	2,533,844	2,553,911		$ 1,848,318
Allowance for credit losses on loans(1)	(23,285)	(44,703)	$ (31,855)
Loans, net	2,510,559	2,509,208
Retained earnings	96,741	84,803
Commercial
Loans held-for-investment:
Total loan balance	631,547	682,280
Allowance for credit losses on loans(1)	(10,453)
Real estate
Loans held-for-investment:
Total loan balance	1,882,734
Allowance for credit losses on loans(1)	(12,750)			(11,671)	$ (10,671)
Consumer
Loans held-for-investment:
Total loan balance	19,882
Allowance for credit losses on loans(1)	(82)			(90)	(116)
Commercial
Loans held-for-investment:
Total loan balance		682,280	6,790
Allowance for credit losses on loans(1)	(10,453)	(12,801)	(6,790)	(15,557)	(17,061)
Commercial \| Commercial
Loans held-for-investment:
Total loan balance	603,345	682,280
CRE - owner occupied
Loans held-for-investment:
Total loan balance		543,164	6,994
Allowance for credit losses on loans(1)	(3,825)	(7,737)	(6,994)
CRE - owner occupied \| Real estate
Loans held-for-investment:
Total loan balance	548,907	543,164
CRE - non-owner occupied
Loans held-for-investment:
Total loan balance	767,821	755,008	11,672
Allowance for credit losses on loans(1)	(3,760)	(15,645)	(11,672)
CRE - non-owner occupied \| Real estate
Loans held-for-investment:
Total loan balance	767,821	755,008
Land and construction
Loans held-for-investment:
Total loan balance		153,358	1,458
Allowance for credit losses on loans(1)	(2,621)	(2,603)	(1,458)	$ (27,318)	$ (27,848)
Land and construction \| Real estate
Loans held-for-investment:
Total loan balance	147,189	153,358
Home equity
Loans held-for-investment:
Total loan balance		117,768	1,321
Allowance for credit losses on loans(1)	(2,244)	(1,746)	(1,321)
Home equity \| Real estate
Loans held-for-investment:
Total loan balance	151,775	117,768
Multi-family
Loans held-for-investment:
Total loan balance		172,875	1,253
Allowance for credit losses on loans(1)	(57)	(1,622)	(1,253)
Multi-family \| Real estate
Loans held-for-investment:
Total loan balance	180,623	172,875
Residential mortgages
Loans held-for-investment:
Total loan balance		96,271	678
Allowance for credit losses on loans(1)	(243)	(708)	(678)
Residential mortgages \| Real estate
Loans held-for-investment:
Total loan balance	100,759	96,271
Consumer and other
Loans held-for-investment:
Total loan balance			1,689
Allowance for credit losses on loans(1)	(82)	(1,841)	$ (1,689)
Consumer and other \| Consumer
Loans held-for-investment:
Total loan balance	33,744	33,445
Consumer
Loans held-for-investment:
Total loan balance		$ 33,445
Consumer \| Consumer
Loans held-for-investment:
Total loan balance	33,744
ASU 2016-03 - Topic 326
Loans held-for-investment:
Allowance for credit losses on loans(1)	(8,570)
ASU 2016-03 - Topic 326 \| Commercial
Loans held-for-investment:
Allowance for credit losses on loans(1)	3,663
ASU 2016-03 - Topic 326 \| CRE - owner occupied
Loans held-for-investment:
Allowance for credit losses on loans(1)	(3,169)
ASU 2016-03 - Topic 326 \| CRE - non-owner occupied
Loans held-for-investment:
Allowance for credit losses on loans(1)	(7,912)
ASU 2016-03 - Topic 326 \| Land and construction
Loans held-for-investment:
Allowance for credit losses on loans(1)	1,163
ASU 2016-03 - Topic 326 \| Home equity
Loans held-for-investment:
Allowance for credit losses on loans(1)	923
ASU 2016-03 - Topic 326 \| Multi-family
Loans held-for-investment:
Allowance for credit losses on loans(1)	(1,196)
ASU 2016-03 - Topic 326 \| Residential mortgages
Loans held-for-investment:
Allowance for credit losses on loans(1)	(435)
ASU 2016-03 - Topic 326 \| Consumer and other
Loans held-for-investment:
Allowance for credit losses on loans(1)	(1,607)
Restatement Adjustment \| ASU 2016-03 - Topic 326
Loans held-for-investment:
Allowance for credit losses on loans(1)	(8,570)
Amount of related income tax effect of a cumulative effect on retained earnings	2,357
Retained earnings	(6,062)
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Commercial
Loans held-for-investment:
Total loan balance	(3,663)
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| CRE - owner occupied
Loans held-for-investment:
Total loan balance	3,169
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| CRE - non-owner occupied
Loans held-for-investment:
Total loan balance	7,912
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Land and construction
Loans held-for-investment:
Total loan balance	(1,163)
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Home equity
Loans held-for-investment:
Total loan balance	(923)
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Multi-family
Loans held-for-investment:
Total loan balance	1,196
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Residential mortgages
Loans held-for-investment:
Total loan balance	435
Restatement Adjustment \| ASU 2016-03 - Topic 326 \| Consumer and other
Loans held-for-investment:
Total loan balance	1,607
Previously Reported \| ASU 2016-03 - Topic 326
Loans held-for-investment:
Allowance for credit losses on loans(1)	(23,285)
Previously Reported \| ASU 2016-03 - Topic 326 \| Commercial
Loans held-for-investment:
Total loan balance	10,453
Previously Reported \| ASU 2016-03 - Topic 326 \| CRE - owner occupied
Loans held-for-investment:
Total loan balance	3,825
Previously Reported \| ASU 2016-03 - Topic 326 \| CRE - non-owner occupied
Loans held-for-investment:
Total loan balance	3,760
Previously Reported \| ASU 2016-03 - Topic 326 \| Land and construction
Loans held-for-investment:
Total loan balance	2,621
Previously Reported \| ASU 2016-03 - Topic 326 \| Home equity
Loans held-for-investment:
Total loan balance	2,244
Previously Reported \| ASU 2016-03 - Topic 326 \| Multi-family
Loans held-for-investment:
Total loan balance	57
Previously Reported \| ASU 2016-03 - Topic 326 \| Residential mortgages
Loans held-for-investment:
Total loan balance	243
Previously Reported \| ASU 2016-03 - Topic 326 \| Consumer and other
Loans held-for-investment:
Total loan balance	$ 82