Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 25,507,951	$ 22,553,180
Non-Accrual	24,055	18,865
Loans and leases (at fair value: $284,900 and $345,634)	25,507,951	22,553,180
Allowance for credit loss on non-accrual loans	13,100	7,500
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	24,447	14,634
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	29,091	17,046
90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	27,729	32,336
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	81,267	64,016
Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	25,402,629	22,470,299
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	12,729,714	11,267,839
Commercial real estate | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,846,426	3,786,887
Non-Accrual	3,282	3,384
Commercial real estate | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,549,761	2,332,422
Non-Accrual	2,121	2,383
Commercial real estate | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,090,661	4,051,202
Non-Accrual	0	0
Commercial real estate | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,036,931	890,338
Non-Accrual	0	0
Commercial real estate | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	205,935	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	321	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	282	101
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	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	24	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	1	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	321	1,526
Commercial real estate | Total Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	307	167
Commercial real estate | Total Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	0	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	3,842,823	3,781,977
Commercial real estate | Current and Other | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,547,333	2,329,872
Commercial real estate | Current and Other | Multifamily, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,090,661	4,051,202
Commercial real estate | Current and Other | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,036,931	890,338
Commercial real estate | Current and Other | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	205,935	206,990
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,587,748	5,386,882
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,003,424	3,008,473
Non-Accrual	3,945	4,225
Commercial | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	914,507	910,733
Non-Accrual	86	0
Commercial | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,669,817	1,467,676
Non-Accrual	14,621	8,873
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,743	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	778	300
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	15,628	6,806
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,073	2,345
Commercial | 60 to 89 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	83	2
Commercial | 60 to 89 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	14,952	8,951
Commercial | 90 Days or More and Accruing | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1	4
Commercial | 90 Days or More and Accruing | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6	357
Commercial | 90 Days or More and Accruing | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,136	3,799
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	7,817	6,976
Commercial | Total Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	867	659
Commercial | Total Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	35,716	19,556
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,991,662	2,997,272
Commercial | Current and Other | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	913,554	910,074
Commercial | Current and Other | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,619,480	1,439,247
Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	7,035,718	5,714,436
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,470,624	4,517,266
Non-Accrual	0	0
Residential | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,565,094	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	869	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	2,406	1,214
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	8,518	3,668
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,191	491
Residential | 90 Days or More and Accruing | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	20,717	27,249
Residential | 90 Days or More and Accruing | Mortgage, net | GNMA Loans
Financing Receivable, Past Due [Line Items]
GNMA Loans past due by 90 days, but not yet repurchased	1,000
Residential | 90 Days or More and Accruing | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,716	732
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	30,104	31,719
Residential | Total Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,313	2,437
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,440,520	4,485,547
Residential | Current and Other | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,559,781	1,194,733
Consumer & Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	154,771	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	420	396
Consumer & Other | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	250	386
Consumer & Other | 90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	152	194
Consumer & Other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	822	976
Consumer & Other | Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 153,949	$ 183,047