Loans - Age Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 6,070,370	$ 5,977,647
Total Past Due	38,576	43,585
Loans, net of deferred fees	6,108,946	6,021,232
Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,362,259	2,384,233
Total Past Due	12,765	14,713
Loans, net of deferred fees	2,375,024	2,398,946
Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	845,931	811,408
Total Past Due	11,575	15,684
Loans, net of deferred fees	857,506	827,092
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	857,961	812,597
Total Past Due	207	628
Loans, net of deferred fees	858,168	813,225
Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	192,199	197,802
Total Past Due	3,335	2,427
Loans, net of deferred fees	195,534	200,229
Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	737,642	716,337
Total Past Due	2,924	1,852
Loans, net of deferred fees	740,566	718,189
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	290,737	265,649
Total Past Due	515	1,234
Loans, net of deferred fees	291,252	266,883
Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	118,113	115,124
Total Past Due	1,315	1,566
Loans, net of deferred fees	119,428	116,690
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	382,994	374,370
Total Past Due	2,784	3,010
Loans, net of deferred fees	385,778	377,380
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	282,534	300,127
Total Past Due	3,156	2,471
Loans, net of deferred fees	285,690	302,598
30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,850	8,255
30 - 59 Days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,640	1,256
30 - 59 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,479	2,759
30 - 59 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	207	208
30 - 59 Days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,236	482
30 - 59 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	177	125
30 - 59 Days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30 - 59 Days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,114	1,338
30 - 59 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,357	1,046
30 - 59 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,640	1,041
60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,869	1,277
60 - 89 Days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	396	306
60 - 89 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,454	350
60 - 89 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60 - 89 Days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,122	294
60 - 89 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	875	0
60 - 89 Days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
60 - 89 Days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22	98
60 - 89 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	156
60 - 89 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	73
Greater than 89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23,857	34,053
Greater than 89 days | Non owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,729	13,151
Greater than 89 days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,642	12,575
Greater than 89 days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	420
Greater than 89 days | Non owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	977	1,651
Greater than 89 days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,872	1,727
Greater than 89 days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	515	1,234
Greater than 89 days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	179	130
Greater than 89 days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,427	1,808
Greater than 89 days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,516	$ 1,357