Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 22,553,180	$ 21,779,367
Nonaccrual	18,865	31,076
Financing Receivable, Allowance For Non-Accrual Credit Losses	7,500	16,700
Total Non-Accrual Loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual	18,900	31,100
Greater Than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	14,634	24,791
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	17,046	47,256
Greater than 90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	32,336	36,361
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	64,016	108,408
Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	22,470,299	21,639,883
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	11,267,839	10,210,182
Commercial Real Estate | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,786,887	3,505,802
Nonaccrual	3,384	3,809
Commercial Real Estate | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,332,422	2,333,945
Nonaccrual	2,383	5,984
Commercial Real Estate | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,051,202	3,349,196
Nonaccrual	0	0
Commercial Real Estate | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	890,338	828,478
Nonaccrual	0	0
Commercial Real Estate | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	206,990	192,761
Nonaccrual	0	0
Commercial Real Estate | Greater Than 30 to 59 Days Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	388	1,214
Commercial Real Estate | Greater Than 30 to 59 Days Past Due | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	101	182
Commercial Real Estate | Greater Than 30 to 59 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Greater Than 30 to 59 Days Past Due | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	3,991
Commercial Real Estate | Greater Than 30 to 59 Days Past Due | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | 60 to 89 Days Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,138	21,309
Commercial Real Estate | 60 to 89 Days Past Due | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	65	103
Commercial Real Estate | 60 to 89 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	215
Commercial Real Estate | 60 to 89 Days Past Due | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | 60 to 89 Days Past Due | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Greater than 90 Days and Accruing | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	815
Commercial Real Estate | Greater than 90 Days and Accruing | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1	208
Commercial Real Estate | Greater than 90 Days and Accruing | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Greater than 90 Days and Accruing | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Greater than 90 Days and Accruing | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Total Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,526	23,338
Commercial Real Estate | Total Past Due | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	167	493
Commercial Real Estate | Total Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	215
Commercial Real Estate | Total Past Due | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	3,991
Commercial Real Estate | Total Past Due | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial Real Estate | Current and Other | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,781,977	3,478,655
Commercial Real Estate | Current and Other | Owner Occupied Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,329,872	2,327,468
Commercial Real Estate | Current and Other | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,051,202	3,348,981
Commercial Real Estate | Current and Other | Construction & Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	890,338	824,487
Commercial Real Estate | Current and Other | Residential Development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	206,990	192,761
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,386,882	6,343,857
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,008,473	4,024,467
Nonaccrual	4,225	2,205
Commercial | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	910,733	862,760
Nonaccrual	0	336
Commercial | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,467,676	1,456,630
Nonaccrual	8,873	18,742
Commercial | Greater Than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,627	562
Commercial | Greater Than 30 to 59 Days Past Due | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	300	1,491
Commercial | Greater Than 30 to 59 Days Past Due | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,806	14,242
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,345	0
Commercial | 60 to 89 Days Past Due | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2	2,667
Commercial | 60 to 89 Days Past Due | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	8,951	18,220
Commercial | Greater than 90 Days and Accruing | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4	4
Commercial | Greater than 90 Days and Accruing | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	357	7
Commercial | Greater than 90 Days and Accruing | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,799	4,796
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,976	566
Commercial | Total Past Due | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	659	4,165
Commercial | Total Past Due | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	19,556	37,258
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,997,272	4,021,696
Commercial | Current and Other | LOC & Other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	910,074	858,259
Commercial | Current and Other | Leases and Equipment Finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,439,247	1,400,630
Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,714,436	5,007,970
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,517,266	3,871,906
Nonaccrual	0	0
Residential | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,197,170	1,136,064
Nonaccrual	0	0
Residential | Greater Than 30 to 59 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	802	1,587
Residential | Greater Than 30 to 59 Days Past Due | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,214	844
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,668	3,912
Residential | 60 to 89 Days Past Due | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	491	544
Residential | Greater than 90 Days and Accruing | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	27,249	27,713
Residential | Greater than 90 Days and Accruing | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	732	2,463
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	31,719	33,212
Residential | Total Past Due | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,437	3,851
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,485,547	3,838,694
Residential | Current and Other | Home Equity Loans & Lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,194,733	1,132,213
Consumer & Other, Net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	184,023	217,358
Nonaccrual	0	0
Consumer & Other, Net | Greater Than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	396	678
Consumer & Other, Net | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	386	286
Consumer & Other, Net | Greater than 90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	194	355
Consumer & Other, Net | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	976	1,319
Consumer & Other, Net | Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 183,047	$ 216,039