Loans and Leases and Allowance for Credit Losses - Loans by aging category and accrual status (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 11,760,346	$ 11,370,815
Loans receivable
Financing Receivable, Past Due [Line Items]
Total loans	11,760,346	11,370,815
Nonaccrual Loans	32,812	61,599
Loans receivable | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	11,720,062	11,288,847
Loans receivable | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	5,750	15,744
Loans receivable | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	1,722	4,625
Loans receivable | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	8,930,556	8,960,888
Nonaccrual Loans	17,815	45,515
Loans receivable | Commercial | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	8,909,189	8,905,003
Loans receivable | Commercial | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	2,172	7,459
Loans receivable | Commercial | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	1,380	2,911
Loans receivable | Commercial | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Owner occupied commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	2,321,685	2,090,443
Nonaccrual Loans	2,714	8,582
Loans receivable | Commercial | Owner occupied commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	2,318,944	2,079,845
Loans receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	27	2,013
Loans receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	3
Loans receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Income producing commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	2,600,858	2,540,750
Nonaccrual Loans	7,588	15,149
Loans receivable | Commercial | Income producing commercial real estate | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	2,593,124	2,522,743
Loans receivable | Commercial | Income producing commercial real estate | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	146	1,608
Loans receivable | Commercial | Income producing commercial real estate | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	1,250
Loans receivable | Commercial | Income producing commercial real estate | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans	1,910,162	2,498,560
Nonaccrual Loans	5,429	16,634
Loans receivable | Commercial | Commercial & industrial | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,903,730	2,480,483
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	584	1,176
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	419	267
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total loans	1,014,830	967,305
Nonaccrual Loans	343	1,745
Loans receivable | Commercial | Construction | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,014,211	964,947
Loans receivable | Commercial | Construction | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	231
Loans receivable | Commercial | Construction | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	276	382
Loans receivable | Commercial | Construction | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total loans	1,083,021	863,830
Nonaccrual Loans	1,741	3,405
Loans receivable | Commercial | Equipment financing | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,079,180	856,985
Loans receivable | Commercial | Equipment financing | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	1,415	2,431
Loans receivable | Commercial | Equipment financing | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	685	1,009
Loans receivable | Commercial | Equipment financing | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans	1,637,885	1,284,920
Nonaccrual Loans	13,313	12,858
Loans receivable | Residential | Residential mortgage | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	1,622,754	1,265,019
Loans receivable | Residential | Residential mortgage | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	1,583	5,549
Loans receivable | Residential | Residential mortgage | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	235	1,494
Loans receivable | Residential | Residential mortgage | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | HELOC
Financing Receivable, Past Due [Line Items]
Total loans	694,034	697,117
Nonaccrual Loans	1,212	2,487
Loans receivable | Residential | HELOC | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	691,814	692,504
Loans receivable | Residential | HELOC | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	920	1,942
Loans receivable | Residential | HELOC | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	88	184
Loans receivable | Residential | HELOC | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total loans	359,815	281,430
Nonaccrual Loans	420	514
Loans receivable | Residential | Construction | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	358,741	280,551
Loans receivable | Residential | Construction | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	654	365
Loans receivable | Residential | Construction | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Construction | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Consumer
Financing Receivable, Past Due [Line Items]
Total loans	138,056	146,460
Nonaccrual Loans	52	225
Loans receivable | Consumer | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans	137,564	145,770
Loans receivable | Consumer | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans	421	429
Loans receivable | Consumer | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans	19	36
Loans receivable | Consumer | Loans Past Due, over 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	$ 0	$ 0