Loans - Age Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 5,988,832	$ 6,021,232
Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,330,376	2,398,946
Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	870,535	827,092
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	902,394	813,225
Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	189,765	200,229
Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	565,704	718,189
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	335,167	266,883
Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	121,096	116,690
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	391,589	377,380
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	282,206	302,598
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	5,965,417	5,977,647
Current | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,323,132	2,384,233
Current | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	861,430	811,408
Current | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	902,394	812,597
Current | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	186,653	197,802
Current | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	564,271	716,337
Current | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	334,652	265,649
Current | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	120,671	115,124
Current | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	391,123	374,370
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	281,091	300,127
30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	5,294	8,255
30 - 59 Days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	521	1,256
30 - 59 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,942	2,759
30 - 59 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	208
30 - 59 Days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	137	482
30 - 59 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	264	125
30 - 59 Days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
30 - 59 Days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	133	1,338
30 - 59 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	466	1,046
30 - 59 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	831	1,041
60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	3,126	1,277
60 - 89 Days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	434	306
60 - 89 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	138	350
60 - 89 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
60 - 89 Days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,160	294
60 - 89 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	26	0
60 - 89 Days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
60 - 89 Days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	93	98
60 - 89 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	156
60 - 89 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	275	73
Greater than 89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	14,995	34,053
Greater than 89 days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	6,289	13,151
Greater than 89 days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	6,025	12,575
Greater than 89 days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	420
Greater than 89 days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	815	1,651
Greater than 89 days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,143	1,727
Greater than 89 days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	515	1,234
Greater than 89 days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	199	130
Greater than 89 days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	1,808
Greater than 89 days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9	1,357
Total past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	23,415	43,585
Total past due | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	7,244	14,713
Total past due | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9,105	15,684
Total past due | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	628
Total past due | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	3,112	2,427
Total past due | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,433	1,852
Total past due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	515	1,234
Total past due | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	425	1,566
Total past due | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	466	3,010
Total past due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 1,115	$ 2,471