Loans - Composition of Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,108,946	$ 6,021,232
Non owner occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,375,024	2,398,946
Owner occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	857,506	827,092
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	858,168	813,225
Non owner occupied residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	195,534	200,229
Commercial, industrial and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	740,566	718,189
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	291,252	266,883
Equipment finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	119,428	116,690
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	385,778	377,380
Home equity and consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 285,690	$ 302,598