Loans and Leases and Allowance for Credit Losses - Loans by Aging Category and Accrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	$ 18,375,246	$ 18,316,862
Commercial | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	3,310,231	3,264,051
Commercial | Income producing CRE
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	4,206,322	4,263,952
Commercial | Commercial & industrial
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	2,404,505	2,411,045
Commercial | Commercial construction
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,936,074	1,859,538
Commercial | Equipment financing
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,543,905	1,541,120
Residential | Commercial construction
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	257,279	301,650
Residential | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	3,239,687	3,198,928
Residential | Home equity
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	969,020	958,987
Residential | Manufactured housing
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	328,121	336,474
Consumer
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	180,102	181,117
Loans receivable
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	18,375,246	18,316,862
Nonaccrual Loans	104,969	91,687
Loans receivable | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	18,218,158	18,171,292
Loans receivable | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	43,880	43,941
Loans receivable | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	8,239	9,942
Loans receivable | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	13,401,037	13,339,706
Nonaccrual Loans	62,321	57,072
Loans receivable | Commercial | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	13,305,800	13,256,853
Loans receivable | Commercial | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	27,712	20,650
Loans receivable | Commercial | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	5,204	5,131
Loans receivable | Commercial | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	3,310,231	3,264,051
Nonaccrual Loans	2,310	3,094
Loans receivable | Commercial | Owner occupied CRE | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	3,300,380	3,258,015
Loans receivable | Commercial | Owner occupied CRE | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	7,136	2,942
Loans receivable | Commercial | Owner occupied CRE | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	405	0
Loans receivable | Commercial | Owner occupied CRE | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Income producing CRE
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	4,206,322	4,263,952
Nonaccrual Loans	29,186	30,128
Loans receivable | Commercial | Income producing CRE | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	4,176,324	4,230,140
Loans receivable | Commercial | Income producing CRE | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	812	3,684
Loans receivable | Commercial | Income producing CRE | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	0	0
Loans receivable | Commercial | Income producing CRE | Loans Past Due, > 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 excluding fair value hedge basis adjustment	2,404,505	2,411,045
Nonaccrual Loans	20,134	13,467
Loans receivable | Commercial | Commercial & industrial | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	2,371,045	2,388,076
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	10,707	8,129
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	2,619	1,373
Loans receivable | Commercial | Commercial & industrial | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Commercial | Commercial construction
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,936,074	1,859,538
Nonaccrual Loans	1,862	1,878
Loans receivable | Commercial | Commercial construction | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,932,826	1,857,660
Loans receivable | Commercial | Commercial construction | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,311	0
Loans receivable | Commercial | Commercial construction | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	75	0
Loans receivable | Commercial | Commercial construction | Loans Past Due, > 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 excluding fair value hedge basis adjustment	1,543,905	1,541,120
Nonaccrual Loans	8,829	8,505
Loans receivable | Commercial | Equipment financing | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,525,225	1,522,962
Loans receivable | Commercial | Equipment financing | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	7,746	5,895
Loans receivable | Commercial | Equipment financing | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	2,105	3,758
Loans receivable | Commercial | Equipment financing | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Commercial construction
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	257,279	301,650
Nonaccrual Loans	1,244	944
Loans receivable | Residential | Commercial construction | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	255,899	299,230
Loans receivable | Residential | Commercial construction | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	51	1,255
Loans receivable | Residential | Commercial construction | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	85	221
Loans receivable | Residential | Commercial construction | Loans Past Due, > 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 excluding fair value hedge basis adjustment	3,239,687	3,198,928
Nonaccrual Loans	16,569	13,944
Loans receivable | Residential | Residential mortgage | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	3,217,293	3,179,329
Loans receivable | Residential | Residential mortgage | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	5,182	4,622
Loans receivable | Residential | Residential mortgage | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	643	1,033
Loans receivable | Residential | Residential mortgage | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Home equity
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	969,020	958,987
Nonaccrual Loans	4,984	3,772
Loans receivable | Residential | Home equity | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	960,734	950,841
Loans receivable | Residential | Home equity | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	2,638	4,106
Loans receivable | Residential | Home equity | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	664	268
Loans receivable | Residential | Home equity | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Residential | Manufactured housing
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	328,121	336,474
Nonaccrual Loans	19,797	15,861
Loans receivable | Residential | Manufactured housing | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	298,850	304,794
Loans receivable | Residential | Manufactured housing | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	7,869	12,622
Loans receivable | Residential | Manufactured housing | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	1,605	3,197
Loans receivable | Residential | Manufactured housing | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Loans receivable | Consumer
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	180,102	181,117
Nonaccrual Loans	54	94
Loans receivable | Consumer | Current Loans
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	179,582	180,245
Loans receivable | Consumer | Loans Past Due, 30 - 59 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	428	686
Loans receivable | Consumer | Loans Past Due, 60 - 89 Days
Financing Receivable, Past Due [Line Items]
Total loans excluding fair value hedge basis adjustment	38	92
Loans receivable | Consumer | Loans Past Due, > 90 Days
Financing Receivable, Past Due [Line Items]
Total loans	$ 0	$ 0