Loans - Risk category of loans by loan segment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	$ 2,193,778	$ 1,912,038
Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	2,144,387	1,904,068
Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	45,651	5,275
Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	3,740	2,695
Commercial
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	302,536	276,035
Commercial | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	280,767	275,741
Commercial | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	21,515	21
Commercial | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	254	273
Paycheck Protection Program (PPP)
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	180,228
Paycheck Protection Program (PPP) | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	180,228
Construction and Land Development
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	191,768	196,776
Construction and Land Development | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	191,472	196,462
Construction and Land Development | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	132	138
Construction and Land Development | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	164	176
HELOC and 1-4 Family Junior Mortgage
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	30,279	28,621
HELOC and 1-4 Family Junior Mortgage | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	30,142	28,483
HELOC and 1-4 Family Junior Mortgage | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	137	138
1st REM - 1-4 Family
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	39,532	36,671
1st REM - 1-4 Family | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	39,235	36,370
1st REM - 1-4 Family | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	123	124
1st REM - 1-4 Family | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	174	177
LOCs and 2nd REM - Rentals
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	20,538	18,671
LOCs and 2nd REM - Rentals | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	19,759	17,890
LOCs and 2nd REM - Rentals | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	474	479
LOCs and 2nd REM - Rentals | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	305	302
1st REM - Rentals
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	199,107	176,648
1st REM - Rentals | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	197,594	174,781
1st REM - Rentals | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	763	1,287
1st REM - Rentals | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	750	580
Multifamily
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	522,491	515,014
Multifamily | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	522,491	515,014
CRE Owner Occupied
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	73,539	66,584
CRE Owner Occupied | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	70,881	65,411
CRE Owner Occupied | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	818
CRE Owner Occupied | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	1,840	1,173
CRE Non-owner Occupied
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	627,651	592,545
CRE Non-owner Occupied | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	605,742	589,457
CRE Non-owner Occupied | Watch
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	21,689	3,088
CRE Non-owner Occupied | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	220
Consumer and other
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	6,109	4,473
Consumer and other | Pass
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	6,076	4,459
Consumer and other | Substandard
Risk category of loans by loan segment, based on the most recent analysis performed by management
Totals	$ 33	$ 14