Allowance for Credit Losses on Loans - Aging of Past Due Loans by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Aging of Past Due Loans by Class of Loans
Total Past Due	$ 18,211		$ 15,315
Current	2,535,958		2,518,848
Total loan balance	2,554,169		2,534,163
30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	8,520		4,770
60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,439		2,234
90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	7,252		8,311
Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due	10,544
Current	671,736
Total loan balance	682,280		631,547
Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	7,256
Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,130
Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	2,158
Real estate
Aging of Past Due Loans by Class of Loans
Total loan balance			1,882,734
Consumer
Aging of Past Due Loans by Class of Loans
Total loan balance			19,882
Commercial
Aging of Past Due Loans by Class of Loans
Total loan balance	682,280	$ 6,790
Commercial | Commercial
Aging of Past Due Loans by Class of Loans
Total Past Due			10,084
Current			593,261
Total loan balance	682,280		603,345
Commercial | Commercial | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			4,770
Commercial | Commercial | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			2,097
Commercial | Commercial | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due			3,217
CRE - owner occupied
Aging of Past Due Loans by Class of Loans
Total loan balance	543,164	6,994
CRE - owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	6,971		5,094
Current	536,193		543,813
Total loan balance	543,164		548,907
CRE - owner occupied | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	693
CRE - owner occupied | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	1,184
CRE - owner occupied | Real estate | 90 Days or Greater Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	5,094		5,094
CRE - non-owner occupied
Aging of Past Due Loans by Class of Loans
Current	755,008		767,821
Total loan balance	755,008	11,672	767,821
CRE - non-owner occupied | Real estate
Aging of Past Due Loans by Class of Loans
Total loan balance	755,008		767,821
Land and construction
Aging of Past Due Loans by Class of Loans
Total loan balance	153,358	1,458
Land and construction | Real estate
Aging of Past Due Loans by Class of Loans
Current	153,358		147,189
Total loan balance	153,358		147,189
Home equity
Aging of Past Due Loans by Class of Loans
Total loan balance	117,768	1,321
Home equity | Real estate
Aging of Past Due Loans by Class of Loans
Total Past Due	696		137
Current	117,072		151,638
Total loan balance	117,768		151,775
Home equity | Real estate | 30-59 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	571
Home equity | Real estate | 60-89 Days Past Due
Aging of Past Due Loans by Class of Loans
Total Past Due	125		137
Multi-family
Aging of Past Due Loans by Class of Loans
Total loan balance	172,875	1,253
Multi-family | Real estate
Aging of Past Due Loans by Class of Loans
Current	172,875		180,623
Total loan balance	172,875		180,623
Residential mortgages
Aging of Past Due Loans by Class of Loans
Total loan balance	96,271	678
Residential mortgages | Real estate
Aging of Past Due Loans by Class of Loans
Current	96,271		100,759
Total loan balance	96,271		100,759
Consumer and other
Aging of Past Due Loans by Class of Loans
Total loan balance		$ 1,689
Consumer and other | Consumer
Aging of Past Due Loans by Class of Loans
Total loan balance	33,445		33,744
Consumer
Aging of Past Due Loans by Class of Loans
Current	33,445
Total loan balance	$ 33,445
Consumer | Consumer
Aging of Past Due Loans by Class of Loans
Current			33,744
Total loan balance			$ 33,744