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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Loans and Allowance for Credit Losses on Loans - Loans Balance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2020	Jan. 01, 2020	Mar. 31, 2019	Dec. 31, 2018
Loans held-for-investment:
Total loan balance	$ 2,696,024		$ 2,696,024		$ 2,534,163
Deferred loan fees, net	(9,635)		(9,635)		(319)
Loans, net of deferred fees	2,686,389	$ 1,877,767	2,686,389	$ 1,877,767	2,533,844
Allowance for credit losses on loans(1)	(45,444)	(26,631)	(45,444)	(26,631)	(23,285)	$ (44,703)	$ (31,855)	$ (27,318)	$ (27,848)
Loans, net	2,640,945		2,640,945		2,510,559
Income tax expense	4,274	4,623	5,142	9,130
Retained earnings	87,654		87,654		96,741
Commercial
Loans held-for-investment:
Total loan balance					603,345
Allowance for credit losses on loans(1)		(15,234)		(15,234)	(10,453)			(15,557)	(17,061)
Real estate
Loans held-for-investment:
Total loan balance					1,897,074
Allowance for credit losses on loans(1)		(11,307)		(11,307)	(12,750)			(11,671)	(10,671)
Consumer
Loans held-for-investment:
Total loan balance					33,744
Allowance for credit losses on loans(1)		$ (90)		$ (90)	(82)			$ (90)	$ (116)
Commercial
Loans held-for-investment:
Total loan balance	878,393		878,393				6,790
Allowance for credit losses on loans(1)	(13,179)		(13,179)		(10,453)	(12,801)	(6,790)
Commercial \| Commercial
Loans held-for-investment:
Total loan balance	878,393		878,393		603,345
SBA Paycheck Protection Program ("PPP") loans \| Commercial
Loans held-for-investment:
Total loan balance	324,550		324,550
CRE - owner occupied
Loans held-for-investment:
Total loan balance	553,463		553,463				6,994
Allowance for credit losses on loans(1)	(8,547)		(8,547)		(3,825)	(7,737)	(6,994)
CRE - owner occupied \| Real estate
Loans held-for-investment:
Total loan balance	553,463		553,463		548,907
CRE - non-owner occupied
Loans held-for-investment:
Total loan balance	725,776		725,776		767,821		11,672
Allowance for credit losses on loans(1)	(15,449)		(15,449)		(3,760)	(15,645)	(11,672)
CRE - non-owner occupied \| Real estate
Loans held-for-investment:
Total loan balance	725,776		725,776		767,821
Land and construction
Loans held-for-investment:
Total loan balance	138,284		138,284				1,458
Allowance for credit losses on loans(1)	(2,552)		(2,552)		(2,621)	(2,603)	(1,458)
Land and construction \| Real estate
Loans held-for-investment:
Total loan balance	138,284		138,284		147,189
Home equity
Loans held-for-investment:
Total loan balance	112,679		112,679				1,321
Allowance for credit losses on loans(1)	(1,851)		(1,851)		(2,244)	(1,746)	(1,321)
Home equity \| Real estate
Loans held-for-investment:
Total loan balance	112,679		112,679		151,775
Multi-family
Loans held-for-investment:
Total loan balance	169,637		169,637				1,253
Allowance for credit losses on loans(1)	(1,828)		(1,828)		(57)	(1,622)	(1,253)
Multi-family \| Real estate
Loans held-for-investment:
Total loan balance	169,637		169,637		180,623
Residential mortgages
Loans held-for-investment:
Total loan balance	95,033		95,033				678
Allowance for credit losses on loans(1)	(825)		(825)		(243)	(708)	(678)
Residential mortgages \| Real estate
Loans held-for-investment:
Total loan balance	95,033		95,033		100,759
Consumer and other
Loans held-for-investment:
Total loan balance	22,759		22,759				1,689
Allowance for credit losses on loans(1)	(1,213)		(1,213)		(82)	$ (1,841)	$ (1,689)
Consumer and other \| Consumer
Loans held-for-investment:
Total loan balance	$ 22,759		$ 22,759		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)
Income tax expense					2,400
Retained earnings					(6,100)
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