Allowance for Credit Losses - Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	$ 40,003	$ 37,688
Charge-offs	(2,053)	(1,936)
Recoveries	541	2,121
Provision for credit losses	25,977	2,130
Balance end of period	71,124	40,003
Commercial, secured by real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	28,950	27,881
Charge-offs	0	(544)
Recoveries	0	251
Provision for credit losses	0	1,362
Balance end of period	0	28,950
Non-owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	0
Charge-offs	(53)
Recoveries	29
Provision for credit losses	8,907
Balance end of period	25,910	0
Owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	0
Charge-offs	(369)
Recoveries	21
Provision for credit losses	1,223
Balance end of period	3,955	0
Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	0
Charge-offs	0
Recoveries	0
Provision for credit losses	3,536
Balance end of period	7,253	0
Non-owner occupied residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	0
Charge-offs	0
Recoveries	22
Provision for credit losses	498
Balance end of period	3,321	0
Commercial, industrial and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	3,289	1,742
Charge-offs	(814)	(645)
Recoveries	207	1,100
Provision for credit losses	8,133	1,092
Balance end of period	13,665	3,289
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,672	3,015
Charge-offs	(77)	0
Recoveries	100	126
Provision for credit losses	487	(469)
Balance end of period	786	2,672
Equipment finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	957	987
Charge-offs	(284)	(414)
Recoveries	65	332
Provision for credit losses	3,333	52
Balance end of period	6,552	957
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	1,725	1,566
Charge-offs	(116)	(50)
Recoveries	21	66
Provision for credit losses	776	143
Balance end of period	3,623	1,725
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,410	2,497
Charge-offs	(340)	(283)
Recoveries	76	246
Provision for credit losses	(916)	(50)
Balance end of period	6,059	2,410
Cumulated adjustment for adoption of ASU
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	6,656	0
Balance end of period		6,656
Cumulated adjustment for adoption of ASU | Commercial, secured by real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	(28,950)
Balance end of period		(28,950)
Cumulated adjustment for adoption of ASU | Non-owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	17,027
Balance end of period		17,027
Cumulated adjustment for adoption of ASU | Owner occupied commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	3,080
Balance end of period		3,080
Cumulated adjustment for adoption of ASU | Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	3,717
Balance end of period		3,717
Cumulated adjustment for adoption of ASU | Non-owner occupied residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,801
Balance end of period		2,801
Cumulated adjustment for adoption of ASU | Commercial, industrial and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,850
Balance end of period		2,850
Cumulated adjustment for adoption of ASU | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	(2,396)
Balance end of period		(2,396)
Cumulated adjustment for adoption of ASU | Equipment finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	2,481
Balance end of period		2,481
Cumulated adjustment for adoption of ASU | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	1,217
Balance end of period		1,217
Cumulated adjustment for adoption of ASU | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance beginning of period	$ 4,829
Balance end of period		$ 4,829