Loans - Non-accrual (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	$ 31,125	$ 42,763
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	1
Amortized Cost Basis of Non-accrual Loans without Related Allowance	21,633	32,337
Non owner occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	12,835	16,537
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	11,193	14,719
Owner occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	8,797	14,271
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	6,972	12,371
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	201	626
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	0	0
Non owner occupied residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	1,417	2,217
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	852	1,580
Commercial, industrial and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	2,252	2,633
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	1,361	1,418
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	718	1,440
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	515	1,234
Equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	300	327
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	0	0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	2,328	2,469
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	0
Amortized Cost Basis of Non-accrual Loans without Related Allowance	740	1,015
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total non-accrual loans	2,277	2,243
Interest Income Recognized on Non-accrual Loans	0	0
Amortized Cost Basis of Loans >= 90 days Past due but still accruing	0	1
Amortized Cost Basis of Non-accrual Loans without Related Allowance	$ 0	$ 0