Contractual Aging of Loan Portfolio by Segment - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	$ 30,016.6	$ 27,041.8
Financing Receivable, Past Due	9.8	11.2
Loans and Leases Receivable, Net of Deferred Income	30,026.4	27,053.0
Financing Receivable, Originated in Current Fiscal Year	6,307.5	6,006.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,758.9	4,935.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,044.9	2,939.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,212.9	1,669.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,355.2	691.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,163.2	1,892.4
Financing Receivable, Revolving	9,183.8	8,919.5
Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29,387.0	26,379.7
Financing Receivable, Originated in Current Fiscal Year	6,284.7	5,938.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,723.2	4,784.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,792.9	2,780.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,115.7	1,542.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,249.5	659.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,070.3	1,818.5
Financing Receivable, Revolving	9,150.7	8,856.1
Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	404.8	451.1
Financing Receivable, Originated in Current Fiscal Year	0.1	23.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	24.1	102.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	151.5	143.4
Financing Receivable, Originated Three Years before Latest Fiscal Year	82.0	80.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	88.0	7.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	32.1	36.8
Financing Receivable, Revolving	27.0	57.1
Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	234.6	222.2
Financing Receivable, Originated in Current Fiscal Year	22.7	43.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11.6	48.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	100.5	15.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	15.2	46.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	17.7	24.6
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	60.8	37.1
Financing Receivable, Revolving	6.1	6.3
Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	2,600.3	2,548.3
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	2,600.3	2,548.3
Financing Receivable, Originated in Current Fiscal Year	365.2	645.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	352.5	214.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	152.9	76.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	51.4	2.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	2.3	0.9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.5	0.0
Financing Receivable, Revolving	1,675.5	1,608.9
Tech & Innovation [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,558.1	2,505.7
Financing Receivable, Originated in Current Fiscal Year	348.3	609.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	336.2	207.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	144.9	76.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	50.4	2.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	2.3	0.9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.5	0.0
Financing Receivable, Revolving	1,675.5	1,608.8
Tech & Innovation [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	17.2	15.3
Financing Receivable, Originated in Current Fiscal Year	0.0	10.7
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11.2	4.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	6.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Tech & Innovation [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	25.0	27.3
Financing Receivable, Originated in Current Fiscal Year	16.9	25.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5.1	2.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	2.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	1.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.1
Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	5,735.3	5,911.0
Financing Receivable, Past Due	0.8	0.2
Loans and Leases Receivable, Net of Deferred Income	5,736.1	5,911.2
Financing Receivable, Originated in Current Fiscal Year	1,588.7	2,072.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	787.1	880.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	650.9	483.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	374.3	274.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	222.8	111.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	135.6	115.6
Financing Receivable, Revolving	1,976.7	1,974.2
Other commercial and industrial [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,616.2	5,737.7
Financing Receivable, Originated in Current Fiscal Year	1,588.6	2,069.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	784.0	819.8
Financing Receivable, Originated Two Years before Latest Fiscal Year	605.6	447.7
Financing Receivable, Originated Three Years before Latest Fiscal Year	353.6	250.7
Financing Receivable, Originated Four Years before Latest Fiscal Year	191.2	99.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	124.7	114.6
Financing Receivable, Revolving	1,968.5	1,935.7
Other commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	78.5	144.7
Financing Receivable, Originated in Current Fiscal Year	0.1	2.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.5	52.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	26.1	32.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	17.2	22.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	29.8	1.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.6	0.2
Financing Receivable, Revolving	2.2	34.3
Other commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	41.4	28.8
Financing Receivable, Originated in Current Fiscal Year	0.0	0.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.6	8.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	19.2	3.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.5	1.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.8	9.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10.3	0.8
Financing Receivable, Revolving	6.0	4.2
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	1,789.9	1,909.3
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,789.9	1,909.3
Financing Receivable, Originated in Current Fiscal Year	194.3	254.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	234.9	327.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	283.6	316.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	241.7	435.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	374.7	159.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	420.0	353.5
Financing Receivable, Revolving	40.7	63.9
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,663.7	1,775.2
Financing Receivable, Originated in Current Fiscal Year	192.4	252.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	232.1	307.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	269.7	302.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	227.8	402.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	348.2	148.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	377.2	323.5
Financing Receivable, Revolving	16.3	39.5
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	74.2	84.2
Financing Receivable, Originated in Current Fiscal Year	0.0	0.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	12.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	3.0	9.3
Financing Receivable, Originated Three Years before Latest Fiscal Year	9.2	24.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	23.3	4.4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14.4	10.5
Financing Receivable, Revolving	24.3	22.4
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	52.0	49.9
Financing Receivable, Originated in Current Fiscal Year	1.9	1.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2.8	7.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	10.9	4.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	4.7	8.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	3.2	6.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	28.4	19.5
Financing Receivable, Revolving	0.1	2.0
Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	1,997.6	1,983.9
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,997.6	1,983.9
Financing Receivable, Originated in Current Fiscal Year	163.4	170.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	182.4	824.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	815.6	521.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	429.3	179.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	171.7	2.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	76.4	123.2
Financing Receivable, Revolving	158.8	162.6
Hotel franchise finance [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,741.2	1,821.7
Financing Receivable, Originated in Current Fiscal Year	163.4	161.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	182.4	792.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	642.4	464.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	399.0	139.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	132.1	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	63.1	101.5
Financing Receivable, Revolving	158.8	162.6
Hotel franchise finance [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	184.0	135.1
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	32.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	116.4	56.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	30.3	27.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	27.2	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10.1	18.2
Financing Receivable, Revolving	0.0	0.0
Hotel franchise finance [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	72.4	27.1
Financing Receivable, Originated in Current Fiscal Year	0.0	8.9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	56.8	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	12.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	12.4	2.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3.2	3.5
Financing Receivable, Revolving	0.0	0.0
Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	3,663.9	3,640.2
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	3,663.9	3,640.2
Financing Receivable, Originated in Current Fiscal Year	621.5	1,041.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	986.2	938.9
Financing Receivable, Originated Two Years before Latest Fiscal Year	749.7	567.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	458.8	410.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	262.4	172.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	312.9	228.9
Financing Receivable, Revolving	272.4	281.0
Other Commercial Real Estate Non owner Occupied [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,623.6	3,544.3
Financing Receivable, Originated in Current Fiscal Year	621.5	1,032.6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	985.8	912.5
Financing Receivable, Originated Two Years before Latest Fiscal Year	744.2	560.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	452.9	384.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	259.7	164.7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	287.6	208.4
Financing Receivable, Revolving	271.9	281.0
Other Commercial Real Estate Non owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13.0	22.2
Financing Receivable, Originated in Current Fiscal Year	0.0	1.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	7.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.2	5.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	2.4	1.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6.9	7.4
Financing Receivable, Revolving	0.5	0.0
Other Commercial Real Estate Non owner Occupied [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	27.3	73.7
Financing Receivable, Originated in Current Fiscal Year	0.0	7.4
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.4	26.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	5.5	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	2.7	20.3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.3	6.5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18.4	13.1
Financing Receivable, Revolving	0.0	0.0
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	5,062.4	2,368.0
Financing Receivable, Past Due	8.9	10.5
Loans and Leases Receivable, Net of Deferred Income	5,071.3	2,378.5
Financing Receivable, Originated in Current Fiscal Year	2,663.9	759.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,259.7	873.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	605.4	407.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	287.0	110.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	79.8	113.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	139.0	74.1
Financing Receivable, Revolving	36.5	39.5
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,061.4	2,367.1
Financing Receivable, Originated in Current Fiscal Year	2,663.9	759.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,258.4	869.3
Financing Receivable, Originated Two Years before Latest Fiscal Year	600.0	402.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	283.9	108.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	79.8	113.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	138.9	74.1
Financing Receivable, Revolving	36.5	39.5
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	9.9	11.4
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1.3	4.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	5.4	5.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	3.1	1.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.1	0.0
Financing Receivable, Revolving	0.0	0.0
Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	2,853.6	2,429.4
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	2,853.6	2,429.4
Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	4,434.7	4,340.2
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	4,434.7	4,340.2
Financing Receivable, Originated in Current Fiscal Year	230.4	135.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	54.5	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.8	1.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.4	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,147.6	4,202.4
Warehouse lending [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,434.7	4,340.2
Financing Receivable, Originated in Current Fiscal Year	230.4	135.2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	54.5	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.9
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.8	1.6
Financing Receivable, Originated Four Years before Latest Fiscal Year	1.4	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	4,147.6	4,202.4
Warehouse lending [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Warehouse lending [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	1,716.3	1,728.8
Financing Receivable, Past Due	0.0	0.0
Loans and Leases Receivable, Net of Deferred Income	1,716.3	1,728.8
Financing Receivable, Originated in Current Fiscal Year	44.6	219.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	216.5	156.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	140.7	81.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	81.5	233.1
Financing Receivable, Originated Four Years before Latest Fiscal Year	226.5	129.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,003.0	905.6
Financing Receivable, Revolving	3.5	3.5
Municipal and nonprofit [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,716.3	1,726.9
Financing Receivable, Originated in Current Fiscal Year	44.6	219.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	216.5	156.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	140.7	81.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	81.5	231.2
Financing Receivable, Originated Four Years before Latest Fiscal Year	226.5	129.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,003.0	905.6
Financing Receivable, Revolving	3.5	3.5
Municipal and nonprofit [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	0.0
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Municipal and nonprofit [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.0	1.9
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	1.9
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Not Past Due	162.6	182.7
Financing Receivable, Past Due	0.1	0.5
Loans and Leases Receivable, Net of Deferred Income	162.7	183.2
Financing Receivable, Originated in Current Fiscal Year	17.0	21.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16.8	15.7
Financing Receivable, Originated Two Years before Latest Fiscal Year	12.6	14.8
Financing Receivable, Originated Three Years before Latest Fiscal Year	5.8	7.5
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.6	1.9
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	75.0	76.5
Financing Receivable, Revolving	30.9	45.7
Other, loan segment | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	158.9	180.3
Financing Receivable, Originated in Current Fiscal Year	14.1	21.1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16.8	15.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	12.5	14.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	5.5	5.8
Financing Receivable, Originated Four Years before Latest Fiscal Year	4.6	1.8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	74.5	75.8
Financing Receivable, Revolving	30.9	45.7
Other, loan segment | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0.2	2.3
Financing Receivable, Originated in Current Fiscal Year	0.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	0.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.1	1.7
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.1	0.5
Financing Receivable, Revolving	0.0	0.0
Other, loan segment | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3.6	0.6
Financing Receivable, Originated in Current Fiscal Year	2.9	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0.0	0.1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.1	0.2
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.2	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.4	0.2
Financing Receivable, Revolving	0.0	0.0
Construction And Land Development Land [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,853.6	2,429.4
Financing Receivable, Originated in Current Fiscal Year	418.5	686.3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	668.3	704.6
Financing Receivable, Originated Two Years before Latest Fiscal Year	633.5	469.1
Financing Receivable, Originated Three Years before Latest Fiscal Year	282.3	15.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	9.0	1.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.8	15.0
Financing Receivable, Revolving	841.2	537.8
Construction And Land Development Land [Member] | Pass [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,812.9	2,380.6
Financing Receivable, Originated in Current Fiscal Year	417.5	677.8
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	656.5	704.2
Financing Receivable, Originated Two Years before Latest Fiscal Year	632.9	429.6
Financing Receivable, Originated Three Years before Latest Fiscal Year	260.3	15.4
Financing Receivable, Originated Four Years before Latest Fiscal Year	3.7	1.2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.8	15.0
Financing Receivable, Revolving	841.2	537.4
Construction And Land Development Land [Member] | Special Mention [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	37.7	47.3
Financing Receivable, Originated in Current Fiscal Year	0.0	8.5
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	10.4	0.4
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.0	38.0
Financing Receivable, Originated Three Years before Latest Fiscal Year	22.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	5.3	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.4
Construction And Land Development Land [Member] | Substandard [Member]
Financing Receivable, Nonaccrual [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3.0	1.5
Financing Receivable, Originated in Current Fiscal Year	1.0	0.0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1.4	0.0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0.6	1.5
Financing Receivable, Originated Three Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0.0	0.0
Financing Receivable, Revolving	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	8.6	9.7
Financial Asset, 30 to 59 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.2
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	8.5	9.1
Financial Asset, 30 to 59 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 30 to 59 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.1	0.4
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	1.2	1.5
Financial Asset, 60 to 89 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.8	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.4	1.4
Financial Asset, 60 to 89 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, 60 to 89 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.1
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Tech & Innovation [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Hotel franchise finance [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Commercial Real Estate Non owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction And Land Development [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Warehouse lending [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Municipal and nonprofit [Member]
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	0.0	0.0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other, loan segment
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Past Due	$ 0.0	$ 0.0