Loans - Age Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 8,320,424	$ 8,343,861
Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,973,652	2,987,959
Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,264,061	1,283,221
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,405,399	1,408,905
Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	202,014	213,986
Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	642,151	638,894
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	317,253	302,745
Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	178,157	179,171
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	997,569	985,768
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	340,168	343,212
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	8,298,377	8,308,054
Current | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,973,184	2,987,738
Current | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,256,517	1,276,251
Current | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,404,901	1,407,309
Current | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	201,040	213,324
Current | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	641,850	638,493
Current | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	317,253	290,047
Current | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	176,169	177,657
Current | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	988,884	975,408
Current | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	338,579	341,827
30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9,593	10,950
30 - 59 Days | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	256	0
30 - 59 Days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	352	405
30 - 59 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	405	1,503
30 - 59 Days | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	457	662
30 - 59 Days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
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	1,254	249
30 - 59 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	5,734	7,469
30 - 59 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,135	662
60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,528	15,610
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	423	0
60 - 89 Days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	93
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	1	0
60 - 89 Days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	12,698
60 - 89 Days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	77	928
60 - 89 Days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	2,010	1,660
60 - 89 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	17	231
Greater than 89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	9,926	9,247
Greater than 89 days | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	212	221
Greater than 89 days | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	6,769	6,565
Greater than 89 days | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	93	0
Greater than 89 days | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	517	0
Greater than 89 days | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	300	401
Greater than 89 days | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	0
Greater than 89 days | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	657	337
Greater than 89 days | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	941	1,231
Greater than 89 days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	437	492
Total past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	22,047	35,807
Total past due | Non-owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	468	221
Total past due | Owner occupied commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	7,544	6,970
Total past due | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	498	1,596
Total past due | Non-owner occupied residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	974	662
Total past due | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	301	401
Total past due | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	0	12,698
Total past due | Equipment finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	1,988	1,514
Total past due | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	8,685	10,360
Total past due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, net of deferred fees	$ 1,589	$ 1,385