Loans - Age Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 8,294,057	$ 7,866,050
Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,980,811	2,906,014
Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,299,977	1,246,189
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,361,628	1,260,814
Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	208,560	218,026
Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	632,919	606,711
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	333,998	380,100
Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	174,946	151,574
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	956,535	765,552
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	344,683	331,070
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	8,273,150	7,842,175
Current | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,980,580	2,905,049
Current | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,293,112	1,235,134
Current | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,361,628	1,260,135
Current | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	208,414	217,407
Current | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	632,518	603,731
Current | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	333,998	379,120
Current | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	173,380	150,842
Current | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	945,995	760,638
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	343,525	330,119
30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9,264	7,799
30 - 59 Days | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	346
30 - 59 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	152	2,854
30 - 59 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
30 - 59 Days | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	146	178
30 - 59 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	184	55
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	601	494
30 - 59 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	7,551	3,031
30 - 59 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	630	841
60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,153	1,730
60 - 89 Days | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
60 - 89 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	477
60 - 89 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	679
60 - 89 Days | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
60 - 89 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	3
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	508	238
60 - 89 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,645	271
60 - 89 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	62
Greater than 89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9,490	14,346
Greater than 89 days | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	231	619
Greater than 89 days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	6,713	7,724
Greater than 89 days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
Greater than 89 days | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	441
Greater than 89 days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	217	2,922
Greater than 89 days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	980
Greater than 89 days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	457	0
Greater than 89 days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,344	1,612
Greater than 89 days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	528	48
Total past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	20,907	23,875
Total past due | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	231	965
Total past due | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	6,865	11,055
Total past due | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	679
Total past due | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	146	619
Total past due | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	401	2,980
Total past due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	980
Total past due | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,566	732
Total past due | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	10,540	4,914
Total past due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 1,158	$ 951