Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 24,432,678	$ 22,553,180
Non-Accrual	18,159	18,865
Loans and leases (at fair value: $309,628 and $345,634)	24,432,678	22,553,180
Allowance for credit loss on non-accrual loans	7,600	7,500
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	15,394	14,634
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	19,265	17,046
90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	26,226	32,336
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	60,885	64,016
Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	24,353,634	22,470,299
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	12,276,274	11,267,839
Commercial real estate | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,798,242	3,786,887
Non-Accrual	3,313	3,384
Commercial real estate | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,497,553	2,332,422
Non-Accrual	2,201	2,383
Commercial real estate | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,768,273	4,051,202
Non-Accrual	0	0
Commercial real estate | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,017,297	890,338
Non-Accrual	0	0
Commercial real estate | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	194,909	206,990
Non-Accrual	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	517	388
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	24	101
Commercial real estate | Greater than 30 to 59 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	249	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	0
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	0	1,138
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1	65
Commercial real estate | 60 to 89 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
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 | 90 Days or More and Accruing | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial real estate | 90 Days or More and Accruing | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	23	1
Commercial real estate | 90 Days or More and Accruing | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial real estate | 90 Days or More and Accruing | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
Commercial real estate | 90 Days or More 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	517	1,526
Commercial real estate | Total Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	48	167
Commercial real estate | Total Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	249	0
Commercial real estate | Total Past Due | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	0
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	3,794,412	3,781,977
Commercial real estate | Current and Other | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,495,304	2,329,872
Commercial real estate | Current and Other | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,768,024	4,051,202
Commercial real estate | Current and Other | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,017,297	890,338
Commercial real estate | Current and Other | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	194,909	206,990
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,401,609	5,386,882
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,904,861	3,008,473
Non-Accrual	4,056	4,225
Commercial | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	920,604	910,733
Non-Accrual	0	0
Commercial | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,576,144	1,467,676
Non-Accrual	8,589	8,873
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	209	4,627
Commercial | Greater than 30 to 59 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	425	300
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	11,417	6,806
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	198	2,345
Commercial | 60 to 89 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	475	2
Commercial | 60 to 89 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	11,554	8,951
Commercial | 90 Days or More and Accruing | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	210	4
Commercial | 90 Days or More and Accruing | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	12	357
Commercial | 90 Days or More and Accruing | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,089	3,799
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	617	6,976
Commercial | Total Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	912	659
Commercial | Total Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	26,060	19,556
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,900,188	2,997,272
Commercial | Current and Other | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	919,692	910,074
Commercial | Current and Other | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,541,495	1,439,247
Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,584,179	5,714,436
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,168,457	4,517,266
Non-Accrual	0	0
Residential | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,415,722	1,197,170
Non-Accrual	0	0
Residential | Greater than 30 to 59 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,251	802
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	870	1,214
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,499	3,668
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	896	491
Residential | 90 Days or More and Accruing | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	21,118	27,249
Residential | 90 Days or More and Accruing | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,578	732
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	27,868	31,719
Residential | Total Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,344	2,437
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,140,589	4,485,547
Residential | Current and Other | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,412,378	1,194,733
Consumer & Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	170,616	184,023
Non-Accrual	0	0
Consumer & Other | Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	432	396
Consumer & Other | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	642	386
Consumer & Other | 90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	196	194
Consumer & Other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,270	976
Consumer & Other | Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 169,346	$ 183,047