Allowance for Credit Losses on Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Loans
3/31/2020	$ 235,706
12/31/2019	450,442
12/31/2018	283,745
12/31/2017	281,314
12/31/2016	219,911
2015 and Prior	504,435
Revolving	578,616
Total loan balance	2,554,169		$ 2,534,163
Balance to report	2,509,208		2,510,559
Loan classified as loss
Loans
Balance to report	0		0
Commercial
Loans
3/31/2020	72,105
12/31/2019	69,863
12/31/2018	51,808
12/31/2017	30,824
12/31/2016	25,103
2015 and Prior	18,912
Revolving	413,665
Total loan balance	682,280	$ 6,790
Commercial | Pass [Member]
Loans
3/31/2020	64,965
12/31/2019	54,854
12/31/2018	37,330
12/31/2017	18,556
12/31/2016	12,307
2015 and Prior	11,754
Revolving	348,529
Total loan balance	548,295
Commercial | Watch [Member]
Loans
3/31/2020	4,115
12/31/2019	6,482
12/31/2018	8,093
12/31/2017	6,756
12/31/2016	3,861
2015 and Prior	6,461
Revolving	48,902
Total loan balance	84,670
Commercial | Special Mention [Member]
Loans
3/31/2020	2,370
12/31/2019	7,724
12/31/2018	5,419
12/31/2017	4,993
12/31/2016	5,763
2015 and Prior	537
Revolving	2,905
Total loan balance	29,711
Commercial | Substandard [Member]
Loans
3/31/2020	55
12/31/2019	368
12/31/2018	23
12/31/2017	519
12/31/2016	2,890
2015 and Prior	107
Revolving	13,034
Total loan balance	16,996
Commercial | Substandard-Nonaccrual [Member]
Loans
3/31/2020	600
12/31/2019	435
12/31/2018	943
12/31/2016	282
2015 and Prior	53
Revolving	295
Total loan balance	2,608
CRE - owner occupied
Loans
3/31/2020	36,781
12/31/2019	95,648
12/31/2018	83,504
12/31/2017	80,761
12/31/2016	59,349
2015 and Prior	170,517
Revolving	16,604
Total loan balance	543,164	6,994
CRE - owner occupied | Pass [Member]
Loans
3/31/2020	31,231
12/31/2019	87,203
12/31/2018	73,534
12/31/2017	66,267
12/31/2016	53,059
2015 and Prior	137,935
Revolving	16,604
Total loan balance	465,833
CRE - owner occupied | Watch [Member]
Loans
3/31/2020	5,216
12/31/2019	6,901
12/31/2018	9,735
12/31/2017	8,204
12/31/2016	5,020
2015 and Prior	20,652
Total loan balance	55,728
CRE - owner occupied | Special Mention [Member]
Loans
3/31/2020	334
12/31/2019	769
12/31/2018	235
12/31/2017	2,850
12/31/2016	550
2015 and Prior	4,377
Total loan balance	9,115
CRE - owner occupied | Substandard [Member]
Loans
12/31/2019	510
12/31/2017	3,440
12/31/2016	720
2015 and Prior	472
Total loan balance	5,142
CRE - owner occupied | Substandard-Nonaccrual [Member]
Loans
12/31/2019	265
2015 and Prior	7,081
Total loan balance	7,346
CRE - non-owner occupied
Loans
3/31/2020	57,046
12/31/2019	156,281
12/31/2018	91,615
12/31/2017	123,608
12/31/2016	76,239
2015 and Prior	246,642
Revolving	3,577
Total loan balance	755,008	11,672	$ 767,821
CRE - non-owner occupied | Pass [Member]
Loans
3/31/2020	57,046
12/31/2019	152,841
12/31/2018	90,155
12/31/2017	123,087
12/31/2016	69,165
2015 and Prior	237,623
Revolving	3,577
Total loan balance	733,494
CRE - non-owner occupied | Watch [Member]
Loans
12/31/2019	3,379
12/31/2018	1,460
12/31/2017	521
12/31/2016	7,074
2015 and Prior	6,657
Total loan balance	19,091
CRE - non-owner occupied | Special Mention [Member]
Loans
12/31/2019	61
2015 and Prior	1,373
Total loan balance	1,434
CRE - non-owner occupied | Substandard [Member]
Loans
2015 and Prior	989
Total loan balance	989
Land and construction
Loans
3/31/2020	58,098
12/31/2019	62,539
12/31/2018	28,182
12/31/2017	1,560
2015 and Prior	1,398
Revolving	1,581
Total loan balance	153,358	1,458
Land and construction | Pass [Member]
Loans
3/31/2020	44,780
12/31/2019	49,617
12/31/2018	28,182
12/31/2017	1,560
2015 and Prior	1,398
Revolving	1,581
Total loan balance	127,118
Land and construction | Watch [Member]
Loans
3/31/2020	7,613
12/31/2019	12,922
Total loan balance	20,535
Land and construction | Special Mention [Member]
Loans
3/31/2020	4,122
Total loan balance	4,122
Land and construction | Substandard [Member]
Loans
3/31/2020	1,583
Total loan balance	1,583
Home equity
Loans
12/31/2018	824
12/31/2017	281
2015 and Prior	272
Revolving	116,391
Total loan balance	117,768	1,321
Home equity | Pass [Member]
Loans
12/31/2018	824
Revolving	109,085
Total loan balance	109,909
Home equity | Watch [Member]
Loans
12/31/2017	281
Revolving	5,750
Total loan balance	6,031
Home equity | Special Mention [Member]
Loans
Revolving	100
Total loan balance	100
Home equity | Substandard [Member]
Loans
2015 and Prior	146
Revolving	1,456
Total loan balance	1,602
Home equity | Substandard-Nonaccrual [Member]
Loans
2015 and Prior	126
Total loan balance	126
Multi-family
Loans
3/31/2020	9,939
12/31/2019	49,914
12/31/2018	18,764
12/31/2017	30,969
12/31/2016	19,033
2015 and Prior	43,412
Revolving	844
Total loan balance	172,875	1,253
Multi-family | Pass [Member]
Loans
3/31/2020	9,939
12/31/2019	48,689
12/31/2018	18,764
12/31/2017	30,371
12/31/2016	18,187
2015 and Prior	43,011
Revolving	844
Total loan balance	169,805
Multi-family | Watch [Member]
Loans
12/31/2016	846
2015 and Prior	401
Total loan balance	1,247
Multi-family | Special Mention [Member]
Loans
12/31/2019	1,225
12/31/2017	598
Total loan balance	1,823
Residential mortgages
Loans
3/31/2020	1,722
12/31/2019	13,096
12/31/2018	5,893
12/31/2017	13,287
12/31/2016	40,042
2015 and Prior	22,231
Total loan balance	96,271	678
Residential mortgages | Pass [Member]
Loans
3/31/2020	1,722
12/31/2019	11,744
12/31/2018	4,205
12/31/2017	11,992
12/31/2016	37,569
2015 and Prior	19,047
Total loan balance	86,279
Residential mortgages | Watch [Member]
Loans
12/31/2019	439
12/31/2018	1,688
12/31/2016	1,912
2015 and Prior	1,846
Total loan balance	5,885
Residential mortgages | Special Mention [Member]
Loans
12/31/2019	691
12/31/2017	1,295
12/31/2016	561
2015 and Prior	1,069
Total loan balance	3,616
Residential mortgages | Substandard [Member]
Loans
12/31/2019	222
2015 and Prior	269
Total loan balance	491
Consumer and other
Loans
Total loan balance		$ 1,689
Consumer
Loans
3/31/2020	15
12/31/2019	3,101
12/31/2018	3,155
12/31/2017	24
12/31/2016	145
2015 and Prior	1,051
Revolving	25,954
Total loan balance	33,445
Consumer | Pass [Member]
Loans
3/31/2020	15
12/31/2019	2,980
12/31/2018	1,589
12/31/2017	24
12/31/2016	14
2015 and Prior	1,051
Revolving	24,941
Total loan balance	30,614
Consumer | Watch [Member]
Loans
12/31/2019	37
12/31/2016	131
Revolving	1,013
Total loan balance	1,181
Consumer | Special Mention [Member]
Loans
12/31/2019	84
Total loan balance	84
Consumer | Substandard-Nonaccrual [Member]
Loans
12/31/2018	1,566
Total loan balance	$ 1,566