Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 37,170,598	$ 26,155,981
Non-Accrual	70,394	30,702
Allowance for credit loss on non-accrual loans	25,900	17,500
GNMA Loans past due by 90 days, but not yet repurchased	700
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	39,947	26,764
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	42,971	38,129
90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	34,796	34,556
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	117,714	99,449
Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	36,982,490	26,025,830
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	19,435,200	13,026,576
Commercial real estate | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,490,638	3,894,840
Non-Accrual	5,308	2,963
Commercial real estate | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,235,227	2,567,761
Non-Accrual	20,745	2,048
Commercial real estate | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,684,495	5,285,791
Non-Accrual	0	0
Commercial real estate | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,669,918	1,077,346
Non-Accrual	0	0
Commercial real estate | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	354,922	200,838
Non-Accrual	0	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,617	811
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	2,546	168
Commercial real estate | Greater than 30 to 59 Days Past Due | Multifamily [Member]
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 | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	503	538
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,476	50
Commercial real estate | 60 to 89 Days Past Due | Multifamily [Member]
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 | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	70	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 [Member]
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 | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,190	1,349
Commercial real estate | Total Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,023	219
Commercial real estate | Total Past Due | Multifamily [Member]
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 | Commercial Real Estate, Non-owner Occupied Term [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,483,140	3,890,528
Commercial real estate | Current and Other | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,208,459	2,565,494
Commercial real estate | Current and Other | Multifamily [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,684,495	5,285,791
Commercial real estate | Current and Other | Construction & development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,669,918	1,077,346
Commercial real estate | Current and Other | Residential development, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	354,922	200,838
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	9,520,454	5,695,773
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,437,915	3,029,547
Non-Accrual	12,283	5,303
Commercial | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,353,548	960,054
Non-Accrual	4,106	0
Commercial | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,728,991	1,706,172
Non-Accrual	27,952	20,388
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,863	1,241
Commercial | Greater than 30 to 59 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	8,533	514
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	18,159	19,929
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,802	1,489
Commercial | 60 to 89 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	288	419
Commercial | 60 to 89 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	19,180	23,288
Commercial | 90 Days or More and Accruing | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	101	19
Commercial | 90 Days or More and Accruing | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	477	4
Commercial | 90 Days or More and Accruing | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	8,028	7,886
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,766	2,749
Commercial | Total Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	9,298	937
Commercial | Total Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	45,367	51,103
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	5,419,866	3,021,495
Commercial | Current and Other | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,340,144	959,117
Commercial | Current and Other | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,655,672	1,634,681
Residential
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	8,021,786	7,279,000
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,121,838	5,647,035
Non-Accrual	0	0
Residential | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,899,948	1,631,965
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	537	847
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	4,757	2,808
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	14,029	10,619
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	2,398	1,526
Residential | 90 Days or More and Accruing | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	22,491	24,943
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	700	6,600
Residential | 90 Days or More and Accruing | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	3,388	1,569
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	37,057	36,409
Residential | Total Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	10,543	5,903
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	6,084,781	5,610,626
Residential | Current and Other | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,889,405	1,626,062
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	193,158	154,632
Non-Accrual	0	0
Consumer Portfolio Segment [Member] | Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	935	446
Consumer Portfolio Segment [Member] | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	295	200
Consumer Portfolio Segment [Member] | 90 Days or More and Accruing
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	240	134
Consumer Portfolio Segment [Member] | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	1,470	780
Consumer Portfolio Segment [Member] | Current and Other
Financing Receivable, Past Due [Line Items]
Total Loans and Leases	$ 191,688	$ 153,852