Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	$ 24,878	$ 33,719
Loans, Collectively evaluated	6,078,069	5,979,260
Loans, Acquired with deteriorated credit quality	5,999	8,253
Loans, net of deferred fees	6,108,946	6,021,232
Allowance for Credit Losses, Individually evaluated	1,239	1,355
Allowance for Credit Losses, Collectively evaluated	66,013	69,769
Allowance for Credit Losses	67,252	71,124	$ 48,884	$ 40,003
Non owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	9,605	12,112
Loans, Collectively evaluated	2,362,334	2,382,717
Loans, Acquired with deteriorated credit quality	3,085	4,117
Loans, net of deferred fees	2,375,024	2,398,946
Allowance for Credit Losses, Individually evaluated	351	355
Allowance for Credit Losses, Collectively evaluated	23,529	25,555
Allowance for Credit Losses	23,880	25,910
Owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	11,131	16,547
Loans, Collectively evaluated	845,786	809,935
Loans, Acquired with deteriorated credit quality	589	610
Loans, net of deferred fees	857,506	827,092
Allowance for Credit Losses, Individually evaluated	0	96
Allowance for Credit Losses, Collectively evaluated	4,003	3,859
Allowance for Credit Losses	4,003	3,955
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	0	0
Loans, Collectively evaluated	858,168	813,225
Loans, Acquired with deteriorated credit quality	0	0
Loans, net of deferred fees	858,168	813,225
Allowance for Credit Losses, Individually evaluated	0	0
Allowance for Credit Losses, Collectively evaluated	7,508	7,253
Allowance for Credit Losses	7,508	7,253
Non owner occupied residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	774	1,459
Loans, Collectively evaluated	194,421	198,334
Loans, Acquired with deteriorated credit quality	339	436
Loans, net of deferred fees	195,534	200,229
Allowance for Credit Losses, Individually evaluated	48	43
Allowance for Credit Losses, Collectively evaluated	2,835	3,278
Allowance for Credit Losses	2,883	3,321
Commercial, industrial and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	1,370	1,596
Loans, Collectively evaluated	737,833	715,129
Loans, Acquired with deteriorated credit quality	1,363	1,464
Loans, net of deferred fees	740,566	718,189
Allowance for Credit Losses, Individually evaluated	810	830
Allowance for Credit Losses, Collectively evaluated	11,329	12,835
Allowance for Credit Losses	12,139	13,665	5,489	3,289
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	515	515
Loans, Collectively evaluated	290,737	265,649
Loans, Acquired with deteriorated credit quality	0	719
Loans, net of deferred fees	291,252	266,883
Allowance for Credit Losses, Individually evaluated	0	0
Allowance for Credit Losses, Collectively evaluated	1,129	786
Allowance for Credit Losses	1,129	786	3,344	2,672
Equipment finance
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	0	0
Loans, Collectively evaluated	119,428	116,690
Loans, Acquired with deteriorated credit quality	0	0
Loans, net of deferred fees	119,428	116,690
Allowance for Credit Losses, Individually evaluated	0	0
Allowance for Credit Losses, Collectively evaluated	6,264	6,552
Allowance for Credit Losses	6,264	6,552	1,257	957
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	1,483	1,490
Loans, Collectively evaluated	384,161	375,482
Loans, Acquired with deteriorated credit quality	134	408
Loans, net of deferred fees	385,778	377,380
Allowance for Credit Losses, Individually evaluated	0	0
Allowance for Credit Losses, Collectively evaluated	3,781	3,623
Allowance for Credit Losses	3,781	3,623	1,600	1,725
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually evaluated	0	0
Loans, Collectively evaluated	285,201	302,099
Loans, Acquired with deteriorated credit quality	489	499
Loans, net of deferred fees	285,690	302,598
Allowance for Credit Losses, Individually evaluated	30	31
Allowance for Credit Losses, Collectively evaluated	5,635	6,028
Allowance for Credit Losses	$ 5,665	$ 6,059	$ 2,401	$ 2,410